“I am like that,” does not help anything.
“I can be different,” does.
“I am like that,” does not help anything.
“I can be different,” does.
Basick EnglishBasick English
• The bandage was wound around the wound.
• The farm was used to produce produce.
• The dump was so full that it had to refuse more refuse.
• The bandage was wound around the wound.
• The farm was used to produce produce.
• The dump was so full that it had to refuse more refuse.
• A chemistry teacher was berating the students for not learning the Periodic Table of the Elements. She said, "Why when I was your age I knew both their names and weights." One kid popped up, "Yeah, but teach, there were so few of them back then.
• A chemistry teacher was berating the students for not learning the Periodic Table of the Elements. She said, "Why when I was your age I knew both their names and weights." One kid popped up, "Yeah, but teach, there were so few of them back then.
Scuba Scuba
• Invented in 1943
• By Jacques - Ives Cousteau and Emile Gagnan.
• Invented in 1943
• By Jacques - Ives Cousteau and Emile Gagnan.
Pressure and water depthPressure and water depth
• At the surface of the water the air pressure equals 1 atm.
• For every 10m of water you add 1 atm.
• At the surface of the water the air pressure equals 1 atm.
• For every 10m of water you add 1 atm.
ProblemProblem
• If a diver dives 40m, how much pressure is on him?
• 5 atm
• If a diver dives 40m, how much pressure is on him?
• 5 atm
Absolute zero Absolute zero
• Substance has zero kinetic energy. All movement would stop.
• Substance has zero kinetic energy. All movement would stop.
Diffusion Diffusion
• Process by which particles of matter fill a space because of random motion.
• (Ex: smells in the air, food coloring in liquid)
• Process by which particles of matter fill a space because of random motion.
• (Ex: smells in the air, food coloring in liquid)
Evaporation Evaporation
• Process by which particles of a liquid form a gas by escaping from the surface.
• Process by which particles of a liquid form a gas by escaping from the surface.
3 Things that affect evaporation
3 Things that affect evaporation
• Temperature
• Surface area
• Humidity
• Temperature
• Surface area
• Humidity
Heat of vaporization Heat of vaporization
• Energy absorbed when 1 kg of a liquid vaporizes at its normal boiling point.
• (The heat of vaporization of water is 2.26 x 106 J / kg)
• Energy absorbed when 1 kg of a liquid vaporizes at its normal boiling point.
• (The heat of vaporization of water is 2.26 x 106 J / kg)
Heat of fusion Heat of fusion
• Energy released as 1 kg of a substance solidifies at its freezing point.
Heat of fusion of water is 3.34 x 105 J/kg
• Energy released as 1 kg of a substance solidifies at its freezing point.
Heat of fusion of water is 3.34 x 105 J/kg
Elastic collisions Elastic collisions
• When a gas particle rebounds without losing speed or no K.E. is lost.
• When a gas particle rebounds without losing speed or no K.E. is lost.
Fractional distillation Fractional distillation
• When mixtures of air are separated into components and these components are separated by differences in their B.P.
• (Used in production of N2 and O2 and other gases.)
• When mixtures of air are separated into components and these components are separated by differences in their B.P.
• (Used in production of N2 and O2 and other gases.)
Factor Label Method Factor Label Method
• Method used to convert measurements in one unit to their equivalent in a second unit .
• Method used to convert measurements in one unit to their equivalent in a second unit .
Problem 1Problem 1
• Determine the number of moles of unknown gas if a sample occupies a volume of 148 mL at 13°C and a pressure of 107.0 kPa.
• Determine the number of moles of unknown gas if a sample occupies a volume of 148 mL at 13°C and a pressure of 107.0 kPa.
WorkWork
• Convert ml to L• 148 ml = .148 L = V
• 13oC = 286 K = T
• P = 107.0 kPa• Plug into the formula PV=nRT
• Convert ml to L• 148 ml = .148 L = V
• 13oC = 286 K = T
• P = 107.0 kPa• Plug into the formula PV=nRT
QuestionQuestion
• What is it called when dry ice (solid carbon dioxide) changes to carbon dioxide gas?
• Answer: Sublimation
• What is it called when dry ice (solid carbon dioxide) changes to carbon dioxide gas?
• Answer: Sublimation
P1V1= P2V2 P1V1= P2V2
• What is the name of the above formula?
• Boyle’s Law
• What is the name of the above formula?
• Boyle’s Law
Problem 2Problem 2
• The gas left in a used aerosol can is at a pressure of 1 atm at 27oC (room temp). If this can is thrown onto a fire, what is the internal pressure of the gas when its temperature reaches 927oC?
• The gas left in a used aerosol can is at a pressure of 1 atm at 27oC (room temp). If this can is thrown onto a fire, what is the internal pressure of the gas when its temperature reaches 927oC?
WorkWork
• Convert temp to Kelvin • 27 + 273 = 300 K • 927 + 273 = 1200 K
• 1 atm = P2
• 300 K 1200K • 1 atm x 1200 K • 300 K• Answer = 4 atm
• Convert temp to Kelvin • 27 + 273 = 300 K • 927 + 273 = 1200 K
• 1 atm = P2
• 300 K 1200K • 1 atm x 1200 K • 300 K• Answer = 4 atm
Problem 3Problem 3
• How many moles of helium are contained in a 5.00 L canister at 101 kPa and 30 o C?
• How many moles of helium are contained in a 5.00 L canister at 101 kPa and 30 o C?