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Temperature, Pressure, Volume, Mass, and Density
Terms in this set (14)
What happens to molecule motion when heating occurs?
Molecules move faster
What happens to molecule motion when cooling occurs?
Molecules slow down
What causes the air pressure inside a container?
The force of molecules pushing against the sides of their container
What happens to pressure when heating occurs?
What happens to pressure when cooling occurs?
Why does a gas' pressure change when it is heated or cooled?
Molecules change speed, so they push against things with a new and different amount of force
For a sealed flexible container that can change size (like a Ziplock bag), this is what happens to the container's mass when it is heated
Mass doesn't change [no stuff can enter or leave, because the container is sealed.]
For a sealed flexible container that can change size (like a Ziplock bag), what happens to the container's pressure when it is heated?
Pressure increases [because the molecules speed up and push harder against the insides of the container]
For a sealed flexible container that can change size (like a Ziplock bag), what happens to the container's volume when it is heated?
Volume increases [because the molecules speed up and push away from each other, pushing the walls outward and making the bag grow bigger]
For a sealed flexible container that can change size (like a Ziplock bag), what happens to the container's density when it is heated?
Density decreases [because the amount of mass in the bag stays the same, but the stronger pressure is making the bag bigger -- so it has the same stuff in a larger space, and that means it is less crowded = less dense.]
If you squeeze a sealed bag of air, what will happen to the temperature of the air in the bag?
The air will heat up [because you gave the air molecules a "push," and that made them move faster.]
If you have been squeezing a sealed bag of air, what will happen to the temperature of the air in the bag when you stop squeezing?
The air will cool down [because the air molecules pushed you outward. This took some of their energy, so they slowed down and got cooler]
Suppose you have an empty 2-liter bottle with the cap on. Why does squeezing the bottle change the temperature inside the bottle?
Because you're pushing the air molecules inside, making them move faster. Faster = hotter
Suppose you have an empty 2-liter bottle with the cap on. You have been squeezing the bottle. Why does releasing the bottle change the temperature inside the bottle?
Instead of you pushing the air molecules, the air molecules are pushing you. Since they are doing the pushing, they are losing energy and giving it to you. Since they lose energy, they slow down. Slower = cooler
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