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10 Cards in this Set
- Front
- Back
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According to particle theory, what is pressure?
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Colliding gas particles!!
When gas particles collide with something they exert a force on it and their momentum and direction change. In a sealed container this creates outward pressure. |
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What does pressure depend on?
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How fast particles are moving and how often they hit walls
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What happens to pressure if you heat a gas?
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The particles move faster and have more KE. They hit container harder and more often. More pressure.
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What happens to pressure if you double the temp in K
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The pressure doubles. They are directly proportional
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How else can you increase pressure?
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Squash gas into smaller container. Particles more squashed up. More collision with walls.
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How else can you decrease
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Put it in a bigger container. Less collisions with walls.
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What is the equation that shows that pressure and volume remain constant at a constant temp
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p1V1 = p2V2
so if you decrease the volume then pressure will change to give you the same answer NEED TO LOOK AT THIS A BUT FURTHER |
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a gas at a pressure of 250 KiloPascals is compressed from a volume of 300cm3 to 175cm3. Find the new pressure of the gas
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p1V1 = p2V2
250 x 300 = p2 x 175 so (250 x 300)/ 175 = 429kPa |
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PAPER 2
What is the pressure/ temp equation? Must be in Kelvins (NOT C) |
In a sealed container pressure/ temp is constant.
p1/T1 = p2/T2 (p1/T1 starting and p2/T2 ending) |
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PAPER 2
A container has a volume of 30 litres. It is filled with gas at pressure of 100 kPa and temp of 290K. What's the new pressure if temp increased to 315K. |
p1/T1 = p2/T2
100/ 290 = p2 / 315 so p2 = (100/290) * 315 = 109kPa |
