matter. what do you know about states of matter? what are the three commonly known states of matter?...
TRANSCRIPT
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Matter
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WHAT DO YOU KNOW ABOUT STATES OF
MATTER?• What are the three commonly known states of
matter?
• What is the gas, liquid and solid form of water?
• How does matter change state?
Watch this animation on states of matter (click “Play Video”):Animation: States of Matter
http://teacher.scholastic.com/activities/studyjams/matter_states/Scholastic
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Each of these states is also called a phase.
There are three common states of matter: solid, liquid, and gas.
States of matter are the physical forms a substance can take.
WHAT ARE STATES OF MATTER?
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THE THREE COMMON STATES OF MATTER
Most substances, like water, can exist in all three states.
A cloud is made of water vapor, a type of gas.
An iceberg is made of water in solid form.
This glass contains liquid water.
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SOLIDS• Solids have a definite
shape and volume, or amount of space an object takes up.
• Solid particles vibrate in place but cannot move from their position, which is why solids maintain their rigid shape.
The particles that make up a solid are packed tightly and held together by strong forces.
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LIQUIDS
The particles that make up a liquid are spaced farther apart and are held together by weaker forces than solids.
• Liquids have a definite volume but not a definite shape.
• Liquid particles move slightly, which allows liquids to flow and take the shape of the container they are in.
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GASES
• Gases do not have a definite volume or shape.
• Gas particles move freely and will expand to fill a container of any size or shape.
The particles that make up a gas are fast-moving and are held together by extremely weak forces.
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CHANGES OF STATE• Matter can change from one
state to another.
• Even though the physical form of the matter changes, it remains the same substance.
• Changes of state occur when thermal energy (heat energy) is absorbed or released by a substance.
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WHAT ARE THE CHANGES OF STATE?
GAS
SOLID LIQUID
Deposition
Sublimatio
n
Boiling / Evaporation
Condensation
Freezing
Melting
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HOW DOES MATTER CHANGE STATE?
• As heat increases, a substance changes from a solid to a liquid, and finally to a gas.
Thermal Energy Added
Tem
per
atu
re
Changes of State
• As heat decreases, a substance changes from a gas to a liquid, and finally to a solid.
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DISCUSSION QUESTIONS• How does pressure and temperature affect the state
of water, carbon dioxide, and hydrogen?
• On Earth, we typically see gases, liquids, and solids. But is there a fourth state of matter?
Use this interactive PBS Web site to find out:www.pbs.org/wgbh/nova/zero/matt-flash.html.
Learn about a fourth state of matter at this Web site:http://www.spaceweathercenter.org/amazing_plasmas/02/02.html
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HANDS-ON SCIENCE(No Lab Required)
Directions1. Place chocolate chips and candy-coated chocolate in separate bags.
2. Place each bag of chocolate in a half-filled mug of room-temperature water.
3. Your teacher will continue to increase the temperature in each mug by adding boiling water a little at a time.
4. As a class, monitor the temperature with a thermometer until the chocolate starts to melt in the bag.
This demo explores melting points.Materialschocolate chips, candy-coated chocolates, baggies, two mugs, water, thermometer
ConclusionAt what temperature does each type of chocolate start to melt? Why do you think this is?
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Solid: has definite shape and volume
Gas: does not have definite volume or shape.
Liquid: has definite volume but not shape
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Physical Change: a change that does not result in new substances.
Melting point: temperature when solid changes to liquid
Freezing point: temperature when liquid changes to a solid:
water is 32 F or 0 C
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Boiling point: temperature when liquid changes to a gas. Water: 212 F… 100 C
Sublimation: changes from a solid to a gas. Example: dry ice
Condenses: changes from gas to liquid because it cools down. Example: water on the outside of a can of pop.
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Matter: has mass and takes up space.
Mass: the amount of matter something has
Volume: amount of space something takes up
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Weight: measure of the force of gravity on an object’s mass
Density: measurement of how much matter is in an object. Mass divided by volume
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Physical Properties:colorsmell
freezing pointmelting pointboiling point
densitysolubility
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Chemical Properties:odor
color change: trees in autumnoxidation
flammabilityPh (acid or base)
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Physical Change: doesn’t change what the substance is.
Can be reversed. Examples: torn piece of paper;
mixing sugar and water
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Chemical Change: causes a chemical reaction and a new
substance is formed. Cannot be reversed.
Examples: paper burned; baking a cake
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Law of Conservation of Mass: Matter can never be created or
destroyed. All matter is present just changes form.
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Dmitri Mendeleev: known for putting the periodic table together as we know it today.
The Periodic Table of elements organizes the elements based on atomic number. There are approximately 100 elements. They are organized into 18 groups and 7 periods.
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Atoms
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Atoms: the smallest parts of something that can be identified.
d. Nucleus: in the center of the atom
c. Electrons: negative charge/outside the nucleus
b. Neutrons: neutral charge/found in the nucleus
a. Protons: positive charge/found in the nucleus
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Atomic Number: represents the number of protons and electrons.
Atomic Mass: represents the number of protons and neutrons.
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If I use Carbon---the atomic number is 6. That means carbon has 6
protons and 6 electrons. To find out how many Neutrons there are plug in the numbers: atomic mass is 12 which equals number of protons
and neutrons. If the protons are 6 then the neutrons are 6.
protons + neutrons = atomic mass
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Element: a substance that cannot be split into simpler substances. Made up of only one kind of atom.Examples: H, O, N, Cl
Mixture: any substance made of 2 or more atoms that can be separated physically.Examples: Tossed Salad, Chex Mix, Cereal
Solution: mixture where particles of different substances are mixed evenly: Example: Powdered fruit drinks
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Molecule: any substance made of 2 or more atoms. Examples: Water:H2O & Table Salt: NaCl & Ozone: O3
Compounds: matter made of 2 or more different elements.Examples: water: H2O & Table sugar: C12H22O11
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Simple Machines
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Notes over Simple Machines
LEVER: 1. Fulcrum: the pivot point where it rotates2. Effort/Force: a push or pull3. Resistance/Load: an object being moved.4. 3 Classes of levers:
a. 1st: Fulcrum in the middle: a crow bar, see-sawb. 2nd Load in the middle: wheel barrel, nutcrackerc. 3rd Effort in the middle: broom, rake
5. M.A.= effort arm divided by resistance arm
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Notes over Simple Machines
Wheel/Axle: • The bigger the wheel compared to the
axle the easier the work.Examples: car wheels, door knobs, skates,
bike tires
2. M.A.= Diameter of wheel divided by the diameter of the axle
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Notes over Simple Machines
Pulley: • Fixed pulley: attached to something. No
M.A.But changes direction of effort.
2. Moveable pulley: moves with the object. Only half as much effort is needed.
3. Block and Tackle pulley: used to lift heavy objects. 2 pulleys are used.
4. M.A. is multiplied by the number of strands in a pulley.
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Notes over Simple Machines
Screw: An inclined plane wrapped around a pole.
Examples: Nut/bolt, jar lid, road around a mountain,
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Notes over Simple Machines
Wedge: An object that cuts separates things.
Examples: Knife, door stop, ax, scissors, fork, tip of
nail
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Notes over Simple Machines
Inclined plane: A flat sloped surface.
Examples: Ramp, roof, staircase
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Notes over Simple Machines1. Simple Machines are used to reduce the force
needed to move an object while increasing the distance over which the force is applied.
2. Friction will reduce the output of simple machines or increase the amount of force needed.
3. Force needed to move an object can be reduced by combining 2 or more simple machines to create a compound machine.
4. The force required to lift an object by yourself is equal to the weight of the object. BUT when you use a simple machine the object can be lifted with less force.
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Newton’s Laws of Motion
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NOTES1. Newton’s 1st Law: an object at rest stays
at rest and an object in motion stays in motion unless a force acts on it.
2. ALSO CALLED THE LAW OF INERTIAFORCES:a. Gravity: pulls/holds onto thingsb. Friction: wears down, slows down, heats up
when 2 objects come in contact with each other.
c. Air resistanceEXAMPLES: a book on the table, swing
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NOTES2. Newton’s 2nd Law: the greater the force
the greater the acceleration. The larger the mass of the object the greater the force required to accelerate or slow down the object.
EXAMPLES: empty/full grocery cart & Diesel or small car
ACCELERATION: speeding upFORCE: the push or pull on an objectNEWTONS: (N)the unit of force required to
accelerate an object. (1 kg-1 m per s2)
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NOTES3. Newton’s 3rd Law: For every action there
is an equal but opposite reaction.
EXAMPLES: firing a gun, rocket shooting
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NOTESBalanced forces: when 2 or more forces act
on the same object equally in opposite directions.
Unbalanced forces: unequal forces that act on an object and change its motion.
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Motion GraphsMotion Graphs
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Interpret The Graph Below:
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Interpret The Graph Below:
The graph shows an object which is not moving (at rest).
The distance stays the same as time goes by because it is not moving.
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Interpret The Graph Below:
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Interpret The Graph Below:
The graph showsthat the objects distance increases as time passes.The object is moving and so it has velocity.
The straight line shows it is a constant (not changing).
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Interpret The Graph Below:
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Interpret The Graph Below:
Just like the previous graph, this graph shows an object moving with constant velocity
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Interpret The Graph Below:
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Interpret The Graph Below:
The curve in the graph shows that the objects velocity is changing as time passes.
This is acceleration.
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Interpret The Graph Below:
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Interpret The Graph Below:
In the first part of the graph the object is moving with constant velocity.
In the second part of the graph the object is at rest (not moving).
In the third part the object is again moving with constant velocity.
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Interpret The Graph Below:
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Interpret The Graph Below:
The graph showsthat the objects velocity does not change as time passes.
It shows constant velocity.
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Interpret The Graph Below:
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Interpret The Graph Below:
The graph showsthat the objects velocity is increasing as time passes – it is accelerating.
The straight line shows that it is constant acceleration.
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Click here for more review:
http://www.usoe.k12.ut.us/curr/science/sciber00/8th/forces/sciber/intro.htm
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Heat
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Temperature: the measure of how hot or cold something is.
Heat: energy that is based on the temperature and mass of an object.
Thermometer: a device used to measure the temperature of an object.
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Absolute Zero: the lowest possible temperature. Kelvin: 0Celcius: -273Fahrenheit: -459.7
Celcius: temperature scale based on freezing & boiling points of water.
Freezing: 0Boiling: 100
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Fahrenheit: a temperature scale based on water freezing.
Freezing: 32Boiling: 212
Kelvin: a temperature scale based on absolute zero.
Freezing: 272Boiling: 373
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Conduction: transfers heat energy through direct contact.
Conductors: materials that allow heat to pass easily.
Examples: water, metals
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Convection: Transfer of heat energy in a liquid or gas in a circular motion. Examples: oven, heater in house, magma under the surface of the earth.
Radiation: transfer of heat energy through the emptiness of space. Examples: sun, microwaves
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Insulators: material that does not allow heat to pass through easily.
Examples: rubber, cloth, styrofoam, wood
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LIGHT
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LIGHT VOCABULARY1. Opaque: does not emit light (ex:
cardboard)2. Luminous: emits light (ex. Sun)3. Transparent: light is able to pass
through the object. (ex: glass)4. Translucent: some light can pass
through (ex: wax paper)5. Refraction: bending of light waves (ex.
Pencil in water)6. Reflection: bouncing back of light waves
(ex. Looking in a mirror)
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LIGHT VOCABULARY7. Transmission: some light is absorbed and some
passes through the object onto the other side. 8. Absorption: If the object looks white, it is because all
or nearly all of the radiation is reflected. If the object appears to have any color other than white, however, it means that all the visible radiation has been absorbed except for the color you see. Objects that absorb all the radiation striking them are known as black bodies.
9. White light reflects light and is made up of 7 colors.
10. The color of an object is determined by the color of light reflected by the object.