tea – obj 5. question 1 a moving walkway in an airport terminal moves at a speed of 1.3 m/s. a...

TEA – OBJ 5TEA – OBJ 5

Question 1Question 1 A moving walkway in an A moving walkway in an

airport terminal moves at airport terminal moves at a speed of 1.3 m/s. A a speed of 1.3 m/s. A woman steps on the woman steps on the walkway and walks at an walkway and walks at an average speed of 1.7 m/s. average speed of 1.7 m/s. A person drives a cart in A person drives a cart in the same direction the same direction alongside the walkway at alongside the walkway at 4.5 m/s. How much faster 4.5 m/s. How much faster will the person driving the will the person driving the cart appear to move from cart appear to move from the point of view of the the point of view of the person on the walkway?person on the walkway?

Question 1Question 1 A moving walkway in an A moving walkway in an

airport terminal moves at airport terminal moves at a speed of 1.3 m/s. A a speed of 1.3 m/s. A woman steps on the woman steps on the walkway and walks at an walkway and walks at an average speed of 1.7 m/s. average speed of 1.7 m/s. A person drives a cart in A person drives a cart in the same direction the same direction alongside the walkway at alongside the walkway at 4.5 m/s. How much faster 4.5 m/s. How much faster will the person driving the will the person driving the cart appear to move from cart appear to move from the point of view of the the point of view of the person on the walkway?person on the walkway? 1.3 + 1.7 = 31.3 + 1.7 = 3

4.5 – 3 = 1.54.5 – 3 = 1.5

Question 2Question 2

The Egyptians used inclined planes to The Egyptians used inclined planes to build the pyramids, because pushing a build the pyramids, because pushing a stone up a ramp, or inclined plane, takes stone up a ramp, or inclined plane, takes less force than lifting it straight up. How less force than lifting it straight up. How much work, in joules, is done if a person much work, in joules, is done if a person uses a force of 10 newtons (N) to move an uses a force of 10 newtons (N) to move an object up an inclined plane that is 12 object up an inclined plane that is 12 meters long?meters long?


The Egyptians used inclined planes to The Egyptians used inclined planes to build the pyramids, because pushing a build the pyramids, because pushing a stone up a ramp, or inclined plane, takes stone up a ramp, or inclined plane, takes less force than lifting it straight up. How less force than lifting it straight up. How much work, in joules, is done if a person much work, in joules, is done if a person uses a force of 10 newtons (N) to move an uses a force of 10 newtons (N) to move an object up an inclined plane that is 12 object up an inclined plane that is 12 meters long?meters long?

120120

Question 3Question 3The diagram below shows a box and the The diagram below shows a box and the

direction of a force applied to the box. direction of a force applied to the box. Which of the following vectors shows the Which of the following vectors shows the direction of the reaction force?direction of the reaction force?


Glenn blows up a balloon. The force of the Glenn blows up a balloon. The force of the air in the balloon pushes against the walls air in the balloon pushes against the walls of the balloon and it expands. What of the balloon and it expands. What opposite force is also acting?opposite force is also acting?


Glenn blows up a balloon. The force of the Glenn blows up a balloon. The force of the air in the balloon pushes against the walls air in the balloon pushes against the walls of the balloon and it expands. What of the balloon and it expands. What opposite force is also acting?opposite force is also acting?

The balloon walls pushing against the air.The balloon walls pushing against the air.


What is a household items that is an What is a household items that is an example of a simple machine that makes example of a simple machine that makes use of the principle of a wedge?use of the principle of a wedge?


What is a household item that is an What is a household item that is an example of a simple machine that makes example of a simple machine that makes use of the principle of a wedge?use of the principle of a wedge?

DoorjambDoorjamb

Question 6Question 6Mr. Morris is trimming branches from the Mr. Morris is trimming branches from the

trees in his yard. Some branches are trees in his yard. Some branches are much thicker than others. He has two much thicker than others. He has two types of pruners to use, shown in the types of pruners to use, shown in the image below. Which pruner will be image below. Which pruner will be best best for for cutting the thicker branches off the trees?cutting the thicker branches off the trees?

Question 6Question 6Mr. Morris is trimming branches from the Mr. Morris is trimming branches from the

trees in his yard. Some branches are trees in his yard. Some branches are much thicker than others. He has two much thicker than others. He has two types of pruners to use, shown in the types of pruners to use, shown in the image below. Which pruner will be image below. Which pruner will be best best for for cutting the thicker branches off the trees? cutting the thicker branches off the trees? A A


Building and home designers use stairs to Building and home designers use stairs to get people from one level to the next. This get people from one level to the next. This is an efficient and space-saving feature is an efficient and space-saving feature that works very well for most people. that works very well for most people. Unfortunately, this system does not work Unfortunately, this system does not work well for individuals who use wheelchairs. well for individuals who use wheelchairs. Which simple machine would BEST aid Which simple machine would BEST aid people in wheelchairs to move from one people in wheelchairs to move from one level to the next?level to the next?


Building and home designers use stairs to Building and home designers use stairs to get people from one level to the next. This get people from one level to the next. This is an efficient and space-saving feature is an efficient and space-saving feature that works very well for most people. that works very well for most people. Unfortunately, this system does not work Unfortunately, this system does not work well for individuals who use wheelchairs. well for individuals who use wheelchairs. Which simple machine would BEST aid Which simple machine would BEST aid people in wheelchairs to move from one people in wheelchairs to move from one level to the next?level to the next?

A long rope with an inclineA long rope with an incline


The diagram below shows a wave The diagram below shows a wave traveling through water. What is the traveling through water. What is the amplitude of the wave?amplitude of the wave?


The diagram below shows a wave The diagram below shows a wave traveling through water. What is the traveling through water. What is the amplitude of the wave? 2amplitude of the wave? 2

Question 9Question 9Based on the image, what is Based on the image, what is truetrue about about

these three waves?these three waves?

Question 9Question 9Based on the image, what is Based on the image, what is truetrue about about

these three waves?these three waves?

They have the same amplitudeThey have the same amplitude


Compared to dull and rough rock surfaces, Compared to dull and rough rock surfaces, shiny and smooth rock surfaces are most shiny and smooth rock surfaces are most likely to cause sunlight to belikely to cause sunlight to be


Compared to dull and rough rock surfaces, Compared to dull and rough rock surfaces, shiny and smooth rock surfaces are most shiny and smooth rock surfaces are most likely to cause sunlight to belikely to cause sunlight to be

REFLECTEDREFLECTED

Question 11Question 11A ray of light hits a mirror in the following A ray of light hits a mirror in the following

way:way:

What is the principle that describes why What is the principle that describes why the light reflects the way it does?the light reflects the way it does?

Question 11Question 11 A ray of light hits a mirror in the following way:A ray of light hits a mirror in the following way:

What is the principle that describes why the What is the principle that describes why the light reflects the way it does?light reflects the way it does?

The angle of incidence is equal to the angle The angle of incidence is equal to the angle of reflection.of reflection.

Question 12Question 12What property of electromagnetic waves What property of electromagnetic waves

makes it possible to use this type of makes it possible to use this type of energy to transmit information between a energy to transmit information between a satellite in space and computers on the satellite in space and computers on the ground?ground?

Question 12Question 12What property of electromagnetic waves What property of electromagnetic waves

makes it possible to use this type of makes it possible to use this type of energy to transmit information between a energy to transmit information between a satellite in space and computers on the satellite in space and computers on the ground?ground?

Electromagnetic waves can travel through Electromagnetic waves can travel through a vacuuma vacuum


A large amount of dynamite is exploded on A large amount of dynamite is exploded on a small island, so that sound waves from a small island, so that sound waves from the explosion pass simultaneously into the the explosion pass simultaneously into the air, sea, and underlying rock. Three air, sea, and underlying rock. Three microphones are placed 100 miles from microphones are placed 100 miles from the explosion, one in air, one in water, and the explosion, one in air, one in water, and one in rock. one in rock.


A large amount of dynamite is exploded on A large amount of dynamite is exploded on a small island, so that sound waves from a small island, so that sound waves from the explosion pass simultaneously into the the explosion pass simultaneously into the air, sea, and underlying rock. Three air, sea, and underlying rock. Three microphones are placed 100 miles from microphones are placed 100 miles from the explosion, one in air, one in water, and the explosion, one in air, one in water, and one in rock. one in rock.

Sound waves traveling through rock would Sound waves traveling through rock would arrive firstarrive first


Rachel is a certified scuba diver. She loves to Rachel is a certified scuba diver. She loves to go diving on the weekends with her friend go diving on the weekends with her friend Martin. When they were diving one afternoon, Martin. When they were diving one afternoon, Rachel wanted to get Martin’s attention to Rachel wanted to get Martin’s attention to show him a lobster, so she rapped on her show him a lobster, so she rapped on her tank with a small stone to create sound tank with a small stone to create sound waves. When Martin heard the clanking, he waves. When Martin heard the clanking, he looked all around before realizing where the looked all around before realizing where the sound was coming from. Why wasn’t Martin sound was coming from. Why wasn’t Martin able to find the direction of the sound right able to find the direction of the sound right away?away?

Question 14Question 14 Rachel is a certified scuba diver. She loves to Rachel is a certified scuba diver. She loves to

go diving on the weekends with her friend go diving on the weekends with her friend Martin. When they were diving one afternoon, Martin. When they were diving one afternoon, Rachel wanted to get Martin’s attention to Rachel wanted to get Martin’s attention to show him a lobster, so she rapped on her tank show him a lobster, so she rapped on her tank with a small stone to create sound waves. with a small stone to create sound waves. When Martin heard the clanking, he looked all When Martin heard the clanking, he looked all around before realizing where the sound was around before realizing where the sound was coming from. Why wasn’t Martin able to find coming from. Why wasn’t Martin able to find the direction of the sound right away?the direction of the sound right away?

Sound waves travel 4 times faster in water Sound waves travel 4 times faster in water than in air so the time delay was too short to than in air so the time delay was too short to determine direction.determine direction.


When an incandescent lightbulb is turned When an incandescent lightbulb is turned on, only about 5 percent of the input on, only about 5 percent of the input energy is used to light the bulb. What energy is used to light the bulb. What happens to the other 95 percent of the happens to the other 95 percent of the input energy?input energy?


When an incandescent light bulb is turned When an incandescent light bulb is turned on, only about 5 percent of the input energy on, only about 5 percent of the input energy is used to light the bulb. What happens to is used to light the bulb. What happens to the other 95 percent of the input energy?the other 95 percent of the input energy?

It is converted into heat energy and is It is converted into heat energy and is released into the atmosphere.released into the atmosphere.


On a hot summer day, a cold glass of On a hot summer day, a cold glass of water is left out on the deck. The transfer water is left out on the deck. The transfer of heat will beof heat will be


On a hot summer day, a cold glass of On a hot summer day, a cold glass of water is left out on the deck. The transfer water is left out on the deck. The transfer of heat will beof heat will be

from the air to the water.from the air to the water.


Mike places a pot of water above a fire. Mike places a pot of water above a fire. The temperature of the fire is 180ºC. He The temperature of the fire is 180ºC. He measures the temperature of the water measures the temperature of the water and finds that it is 90ºC. Why is the water and finds that it is 90ºC. Why is the water at a lower temperature than the fire?at a lower temperature than the fire?


Mike places a pot of water above a fire. Mike places a pot of water above a fire. The temperature of the fire is 180ºC. He The temperature of the fire is 180ºC. He measures the temperature of the water measures the temperature of the water and finds that it is 90ºC. Why is the water and finds that it is 90ºC. Why is the water at a lower temperature than the fire?at a lower temperature than the fire?

Some of the heat energy from the fire is Some of the heat energy from the fire is lost to the atmosphere. lost to the atmosphere.

Question 18 Question 18

A battery is rated to provide 20 watts of A battery is rated to provide 20 watts of power. When the battery is placed in a toy power. When the battery is placed in a toy car, the car's kinetic energy increases as car, the car's kinetic energy increases as though the battery generated only 17 though the battery generated only 17 watts. Which statement best explains watts. Which statement best explains why?why?

Question 18 Question 18

A battery is rated to provide 20 watts of A battery is rated to provide 20 watts of power. When the battery is placed in a toy power. When the battery is placed in a toy car, the car's kinetic energy increases as car, the car's kinetic energy increases as though the battery generated only 17 though the battery generated only 17 watts. Which statement best explains watts. Which statement best explains why?why?

Some of the energy is lost as heat energy.Some of the energy is lost as heat energy.

Question 19Question 19A windmill uses the power of the wind to A windmill uses the power of the wind to

turn a wheel made of blades. This rotation turn a wheel made of blades. This rotation produces mechanical energy. The produces mechanical energy. The mechanical energy is used to pump water mechanical energy is used to pump water from underneath the ground. What type of from underneath the ground. What type of energy is produced when the wind causes energy is produced when the wind causes the blades to rotate?the blades to rotate?

Question 19Question 19A windmill uses the power of the wind to A windmill uses the power of the wind to

turn a wheel made of blades. This rotation turn a wheel made of blades. This rotation produces mechanical energy. The produces mechanical energy. The mechanical energy is used to pump water mechanical energy is used to pump water from underneath the ground. What type of from underneath the ground. What type of energy is produced when the wind causes energy is produced when the wind causes the blades to rotate?the blades to rotate?

kinetic energykinetic energy

Question 20Question 20 Temperatures of two Temperatures of two

places, A and B, were places, A and B, were recorded for 24 hours recorded for 24 hours and tabulated as shown and tabulated as shown below. Place A is below. Place A is surrounded by forests surrounded by forests and mountains, and mountains, whereas place B is an whereas place B is an industrial area. Why do industrial area. Why do you think place B was you think place B was comparatively hotter comparatively hotter than place A than place A throughout the day?throughout the day?

Question 20Question 20 Temperatures of two Temperatures of two

places, A and B, were places, A and B, were recorded for 24 hours and recorded for 24 hours and tabulated as shown below. tabulated as shown below. Place A is surrounded by Place A is surrounded by forests and mountains, forests and mountains, whereas place B is an whereas place B is an industrial area. Why do you industrial area. Why do you think place B was think place B was comparatively hotter than comparatively hotter than place A throughout the place A throughout the day?day?

Greenhouse gases and Greenhouse gases and pollutants accumulate over pollutants accumulate over industries to retain more of industries to retain more of solar heatsolar heat


Solar power is used to perform all Solar power is used to perform all EXCEPT which of the following actions?EXCEPT which of the following actions?


Solar power is used to perform all Solar power is used to perform all EXCEPT which of the following actions?EXCEPT which of the following actions?

run a manual bicyclerun a manual bicycle


A clothing company is marketing garments A clothing company is marketing garments that are able to disperse heat, remove that are able to disperse heat, remove perspiration, and prevent build-up of static perspiration, and prevent build-up of static electricity. This type of clothing is perfect electricity. This type of clothing is perfect for mail carriers who work during the hot for mail carriers who work during the hot and dry summer months in rural Texas. and dry summer months in rural Texas. Which item(s) would you select for the Which item(s) would you select for the mail carriers to wear?mail carriers to wear?


A clothing company is marketing garments A clothing company is marketing garments that are able to disperse heat, remove that are able to disperse heat, remove perspiration, and prevent build-up of static perspiration, and prevent build-up of static electricity. This type of clothing is perfect for electricity. This type of clothing is perfect for mail carriers who work during the hot and dry mail carriers who work during the hot and dry summer months in rural Texas. Which item(s) summer months in rural Texas. Which item(s) would you select for the mail carriers to would you select for the mail carriers to wear?wear?

cottoncotton


You are examining four cylinders made of You are examining four cylinders made of aluminum, each with a different length and aluminum, each with a different length and cross-sectional area. Based on the sizes cross-sectional area. Based on the sizes below, which would you expect to have the below, which would you expect to have the highest thermal conductivity given an highest thermal conductivity given an equal temperature gradient?equal temperature gradient?


You are examining four cylinders made of You are examining four cylinders made of aluminum, each with a different length and aluminum, each with a different length and cross-sectional area. Based on the sizes cross-sectional area. Based on the sizes below, which would you expect to have the below, which would you expect to have the highest thermal conductivity given an highest thermal conductivity given an equal temperature gradient?equal temperature gradient?

length = 3 cm; cross-sectional area = 2 length = 3 cm; cross-sectional area = 2 mmmm22


Irene bought a new house and has Irene bought a new house and has decided to rewire it. She wants to be able decided to rewire it. She wants to be able to turn some lights off and have the others to turn some lights off and have the others remain lit. What type of circuits should she remain lit. What type of circuits should she use and why?use and why?


Irene bought a new house and has decided to Irene bought a new house and has decided to rewire it. She wants to be able to turn some rewire it. She wants to be able to turn some lights off and have the others remain lit. What lights off and have the others remain lit. What type of circuits should she use and why?type of circuits should she use and why?

She should use parallel circuits because when She should use parallel circuits because when one light turns off, the other lights remain lit.one light turns off, the other lights remain lit.


What happens when one light burns out in What happens when one light burns out in a parallel circuit?a parallel circuit?


What happens when one light burns out in What happens when one light burns out in a parallel circuit?a parallel circuit?

The other lights remain lit.The other lights remain lit.


Electromagnets are artificial magnets that Electromagnets are artificial magnets that are widely used in electronic appliances. are widely used in electronic appliances. They are made by wrapping wire coil They are made by wrapping wire coil around an iron core. The coil and the iron around an iron core. The coil and the iron core do not exert magnetic force on their core do not exert magnetic force on their own. What produces the magnetic force in own. What produces the magnetic force in these electromagnets?these electromagnets?


Electromagnets are artificial magnets that are Electromagnets are artificial magnets that are widely used in electronic appliances. They are widely used in electronic appliances. They are made by wrapping wire coil around an iron made by wrapping wire coil around an iron core. The coil and the iron core do not exert core. The coil and the iron core do not exert magnetic force on their own. What produces magnetic force on their own. What produces the magnetic force in these electromagnets?the magnetic force in these electromagnets?

electric force of the vibrating electrons in the electric force of the vibrating electrons in the current-carrying wirecurrent-carrying wire


Which of the following is an Which of the following is an inaccurateinaccurate representation of the relationship between representation of the relationship between electricity and magnetism?electricity and magnetism?


Which of the following is an Which of the following is an inaccurateinaccurate representation of the relationship between representation of the relationship between electricity and magnetism?electricity and magnetism?

A compass converts an electrical charge A compass converts an electrical charge to magnetism.to magnetism.


The illustration below shows the water The illustration below shows the water temperature at four different points in a temperature at four different points in a pool. Based on what you know about the pool. Based on what you know about the transfer of heat, which is true?transfer of heat, which is true?


Which of the following describes the flow Which of the following describes the flow of heat in a low-pressure weather system?of heat in a low-pressure weather system?


Which of the following describes the flow Which of the following describes the flow of heat in a low-pressure weather system?of heat in a low-pressure weather system?

Warmer air rises from the system, cools as Warmer air rises from the system, cools as it rises, and so transfers energy out of the it rises, and so transfers energy out of the system.system.


The picture below shows a small cube in a The picture below shows a small cube in a glass of water. The densities of several glass of water. The densities of several substances are listed in the table. Which substances are listed in the table. Which of the substances in the table could the of the substances in the table could the cube be made of?cube be made of?


The picture below shows a small cube in a The picture below shows a small cube in a glass of water. The densities of several glass of water. The densities of several substances are listed in the table. Which substances are listed in the table. Which of the substances in the table could the of the substances in the table could the cube be made of?cube be made of?

CorkCork


When small particles settle through water When small particles settle through water faster than large particles, the small faster than large particles, the small particles are probablyparticles are probably


When small particles settle through water When small particles settle through water faster than large particles, the small faster than large particles, the small particles are probablyparticles are probably

denser.denser.

Question 32Question 32 In Ernest Rutherford’s famous gold-foil In Ernest Rutherford’s famous gold-foil

experiment, a beam of positively charged experiment, a beam of positively charged particles was aimed at a very thin sheet of particles was aimed at a very thin sheet of gold foil. His surprising results showed that gold foil. His surprising results showed that although most of the particles passed although most of the particles passed through the gold foil as expected, some of through the gold foil as expected, some of the particles were deflected, and a few the particles were deflected, and a few even bounced back. Which of the following even bounced back. Which of the following atomic models atomic models best best fits Rutherford’s fits Rutherford’s results?results?

Question 32Question 32 In Ernest Rutherford’s famous gold-foil In Ernest Rutherford’s famous gold-foil

experiment, a beam of positively charged experiment, a beam of positively charged particles was aimed at a very thin sheet of particles was aimed at a very thin sheet of gold foil. His surprising results showed that gold foil. His surprising results showed that although most of the particles passed through although most of the particles passed through the gold foil as expected, some of the the gold foil as expected, some of the particles were deflected, and a few even particles were deflected, and a few even bounced back. Which of the following atomic bounced back. Which of the following atomic models models best best fits Rutherford’s results?fits Rutherford’s results?

The atom is mostly empty space, with a tiny The atom is mostly empty space, with a tiny nucleus of positively charged particles.nucleus of positively charged particles.


Democritus, a Greek philosopher, thought Democritus, a Greek philosopher, thought that you could keep cutting something into that you could keep cutting something into smaller and smaller pieces, and you would smaller and smaller pieces, and you would eventually end up with a particle that could eventually end up with a particle that could no longer be cut. Democritus called that no longer be cut. Democritus called that particle a(n)particle a(n)


Democritus, a Greek philosopher, thought Democritus, a Greek philosopher, thought that you could keep cutting something into that you could keep cutting something into smaller and smaller pieces, and you would smaller and smaller pieces, and you would eventually end up with a particle that could eventually end up with a particle that could no longer be cut. Democritus called that no longer be cut. Democritus called that particle a(n)particle a(n)

AtomAtom

Question 34Question 34During a fireworks display after a football During a fireworks display after a football

game at the high school, Stella become game at the high school, Stella become curious about how the different colors of curious about how the different colors of the fireworks are created. She suspects the fireworks are created. She suspects they are created by different materials that they are created by different materials that burn with different colors. Which of the burn with different colors. Which of the following analysis techniques could she following analysis techniques could she use to safely find what materials are used use to safely find what materials are used in the fireworks?in the fireworks?

Question 34Question 34 During a fireworks display after a football During a fireworks display after a football

game at the high school, Stella become game at the high school, Stella become curious about how the different colors of the curious about how the different colors of the fireworks are created. She suspects they fireworks are created. She suspects they are created by different materials that burn are created by different materials that burn with different colors. Which of the following with different colors. Which of the following analysis techniques could she use to safely analysis techniques could she use to safely find what materials are used in the find what materials are used in the fireworks?fireworks?

spectral analysis spectral analysis

Question 35Question 35 You have the opportunity to work for your You have the opportunity to work for your

uncle's fireworks company. Recently, the uncle's fireworks company. Recently, the company had moved all of their materials company had moved all of their materials from one warehouse to another. During the from one warehouse to another. During the move, the labels fell off several containers move, the labels fell off several containers that hold the metal salts that make the that hold the metal salts that make the colors in fireworks. You need to figure out colors in fireworks. You need to figure out an inexpensive way to determine which of an inexpensive way to determine which of the metal salts produce what colors. Which the metal salts produce what colors. Which test will you run on the metal salts?test will you run on the metal salts?

Question 35Question 35 You have the opportunity to work for your You have the opportunity to work for your

uncle's fireworks company. Recently, the uncle's fireworks company. Recently, the company had moved all of their materials company had moved all of their materials from one warehouse to another. During the from one warehouse to another. During the move, the labels fell off several containers move, the labels fell off several containers that hold the metal salts that make the colors that hold the metal salts that make the colors in fireworks. You need to figure out an in fireworks. You need to figure out an inexpensive way to determine which of the inexpensive way to determine which of the metal salts produce what colors. Which test metal salts produce what colors. Which test will you run on the metal salts?will you run on the metal salts?

Conduct a simple flame test using ethanol as Conduct a simple flame test using ethanol as the control.the control.


Beryllium oxide (BeO) is the most powerful Beryllium oxide (BeO) is the most powerful oxidizing agent, while strontium oxide oxidizing agent, while strontium oxide (SrO) is the least. What can you conclude (SrO) is the least. What can you conclude from this statement?from this statement?


Beryllium oxide (BeO) is the most powerful Beryllium oxide (BeO) is the most powerful oxidizing agent, while strontium oxide oxidizing agent, while strontium oxide (SrO) is the least. What can you conclude (SrO) is the least. What can you conclude from this statement?from this statement?

The oxidizing power of an element The oxidizing power of an element decreases along a group.decreases along a group.


Iodine is placed in the group of halogens Iodine is placed in the group of halogens on the periodic table. Which of the on the periodic table. Which of the following statements supports the following statements supports the classification of iodine as an element?classification of iodine as an element?


Iodine is placed in the group of halogens Iodine is placed in the group of halogens on the periodic table. Which of the on the periodic table. Which of the following statements supports the following statements supports the classification of iodine as an element?classification of iodine as an element?

It cannot be decomposed.It cannot be decomposed.


Which of the following is a physical Which of the following is a physical property of water?property of water?


Which of the following is a physical Which of the following is a physical property of water?property of water?

Water freezes and becomes a solid at Water freezes and becomes a solid at 0°C.0°C.


Glow sticks can be made from different Glow sticks can be made from different chemical combinations. Rory had two chemical combinations. Rory had two different brands of glow sticks that he different brands of glow sticks that he bought for a school camping trip. When he bought for a school camping trip. When he snapped both sticks at the same time, he snapped both sticks at the same time, he noticed that one of the sticks glowed noticed that one of the sticks glowed brighter. What can be assumed about the brighter. What can be assumed about the chemicals in the stick that glowed chemicals in the stick that glowed brighter?brighter?


Glow sticks can be made from different chemical Glow sticks can be made from different chemical combinations. Rory had two different brands of combinations. Rory had two different brands of glow sticks that he bought for a school camping glow sticks that he bought for a school camping trip. When he snapped both sticks at the same trip. When he snapped both sticks at the same time, he noticed that one of the sticks glowed time, he noticed that one of the sticks glowed brighter. What can be assumed about the brighter. What can be assumed about the chemicals in the stick that glowed brighter?chemicals in the stick that glowed brighter?

their kinetic energy was greater when combinedtheir kinetic energy was greater when combined


Batteries work by creating a reaction Batteries work by creating a reaction between two chemicals. When some between two chemicals. When some batteries have been completely used, they batteries have been completely used, they have less mass than unused batteries. have less mass than unused batteries. Which of the following statements Which of the following statements best best describes this? describes this?

. .


Batteries work by creating a reaction Batteries work by creating a reaction between two chemicals. When some between two chemicals. When some batteries have been completely used, they batteries have been completely used, they have less mass than unused batteries. have less mass than unused batteries. Which of the following statements Which of the following statements best best describes this? describes this?

Mass has been converted into energy. Mass has been converted into energy.


Nuclear fusion is one of the universe’s Nuclear fusion is one of the universe’s most fundamental processes. Essentially it most fundamental processes. Essentially it is responsible for all of the energy we use is responsible for all of the energy we use here on Earth. What happens during here on Earth. What happens during fusion?fusion?


Nuclear fusion is one of the universe’s most Nuclear fusion is one of the universe’s most fundamental processes. Essentially it is fundamental processes. Essentially it is responsible for all of the energy we use responsible for all of the energy we use here on Earth. What happens during here on Earth. What happens during fusion?fusion?

Hydrogen (H) atoms merge to form helium Hydrogen (H) atoms merge to form helium (He) and release energy.(He) and release energy.


After three days of rain, cars in a one After three days of rain, cars in a one block area displayed discolored spots on block area displayed discolored spots on the hoods and rooftops. This area has the hoods and rooftops. This area has quite a few factories that produce heavy quite a few factories that produce heavy air pollution. Which of the following air pollution. Which of the following describes the most probable cause of the describes the most probable cause of the damage to the cars?damage to the cars?


After three days of rain, cars in a one block After three days of rain, cars in a one block area displayed discolored spots on the hoods area displayed discolored spots on the hoods and rooftops. This area has quite a few and rooftops. This area has quite a few factories that produce heavy air pollution. factories that produce heavy air pollution. Which of the following describes the most Which of the following describes the most probable cause of the damage to the cars?probable cause of the damage to the cars?

The byproducts of combustion from factories The byproducts of combustion from factories and car engines mixed with the air and rain to and car engines mixed with the air and rain to form nitric and sulfuric acids.form nitric and sulfuric acids.


What happens to sodium chloride (NaCl) What happens to sodium chloride (NaCl) when it is mixed with the "universal when it is mixed with the "universal solvent," water (Hsolvent," water (H220).0).


What happens to sodium chloride (NaCl) What happens to sodium chloride (NaCl) when it is mixed with the "universal when it is mixed with the "universal solvent," water (Hsolvent," water (H220).0).

NaNa++ and Cl and Cl-- are split apart and become are split apart and become free ions which then "float" freely in the free ions which then "float" freely in the water solutionwater solution


Healthy human blood has a pH between Healthy human blood has a pH between 7.38 and 7.42. If your pH drops below 7, 7.38 and 7.42. If your pH drops below 7, your body may not function properly your body may not function properly because your blood has becomebecause your blood has become


Healthy human blood has a pH between Healthy human blood has a pH between 7.38 and 7.42. If your pH drops below 7, 7.38 and 7.42. If your pH drops below 7, your body may not function properly your body may not function properly because your blood has becomebecause your blood has become

acidic.acidic.


A SCUBA diver is diving to the bottom of a A SCUBA diver is diving to the bottom of a body of water that is over 100 meters body of water that is over 100 meters deep. He needs to be careful and ascend deep. He needs to be careful and ascend slowly, because he might get "the bends" slowly, because he might get "the bends" and could possibly die. This is also known and could possibly die. This is also known as decompression sickness and can as decompression sickness and can happen when nitrogen bubbles build up in happen when nitrogen bubbles build up in the blood stream. This happens because?the blood stream. This happens because?


A SCUBA diver is diving to the bottom of a A SCUBA diver is diving to the bottom of a body of water that is over 100 meters deep. He body of water that is over 100 meters deep. He needs to be careful and ascend slowly, needs to be careful and ascend slowly, because he might get "the bends" and could because he might get "the bends" and could possibly die. This is also known as possibly die. This is also known as decompression sickness and can happen decompression sickness and can happen when nitrogen bubbles build up in the blood when nitrogen bubbles build up in the blood stream. This happens because?stream. This happens because?

with increasing underwater pressure, the with increasing underwater pressure, the solubility of nitrogen gas increases.solubility of nitrogen gas increases.


After a big meal late at night, some people After a big meal late at night, some people suffer from acid indigestion. Acid suffer from acid indigestion. Acid indigestion occurs when the stomach indigestion occurs when the stomach makes too much hydrochloric acid (HCl), makes too much hydrochloric acid (HCl), causing pain. Many people treat this causing pain. Many people treat this situation with antacids that they have to situation with antacids that they have to dissolve in a glass of water. In this dissolve in a glass of water. In this situation, a crushed tablet wouldsituation, a crushed tablet would


After a big meal late at night, some people After a big meal late at night, some people suffer from acid indigestion. Acid suffer from acid indigestion. Acid indigestion occurs when the stomach indigestion occurs when the stomach makes too much hydrochloric acid (HCl), makes too much hydrochloric acid (HCl), causing pain. Many people treat this causing pain. Many people treat this situation with antacids that they have to situation with antacids that they have to dissolve in a glass of water. In this dissolve in a glass of water. In this situation, a crushed tablet wouldsituation, a crushed tablet would

dissolve faster than a whole table.dissolve faster than a whole table.

tea – obj 5. question 1 a moving walkway in an airport terminal moves at a speed of 1.3 m/s. a...

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moving walkway

reaction force

inclined planes

average speed

airport terminal

newtons n

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woman steps