SP9d Gas temperature and Pressure

Question 1

1 Pa (pascal) = ?

Answer 1

1N/m² (netwon/metre²)

Question 2

Atmospheric pressure = ?

Answer 2

1.01 x 10⁵ Pa / 101 kPa

Question 3

How to convert from kelvin to celsius?

Answer 3

subtact 273.

Question 4

What is the temperature of a gas?

Answer 4

the measure of average kinetic energy of the particles.

Question 5

Is the relationship between kinetic energy of gas particles and absolute temperature directly or inversely proportional?

Answer 5

directly proportional.

Question 6

Why does a gas exert pressure on the walls of its container? (4)

Answer 6

.In a gas, particles move around rapidly frequently colliding with the wall
.When they collide they bounce off with the same speed in a dif direction
.This means their velocity has changed, so their momentum must have changed, so there must have been a force on the particle to cause this
.By Newton’s Third Law there must have been a force exerted on the law

Question 7

How often molecules hit the wall depends on what?

Answer 7

.size of container
.speed of molecules
.number of molecules in container

Question 8

The momentum change when each molecule hits the wall depends on what?

Answer 8

.mass of molecules
.speed of moleucles

Question 9

How are temp and pressure for a gas related?

Answer 9

.if we heat gas - pressure increases (for a fixed mass of gas at constant volume)
.as temp inceases, average speed and KE of particles increases
.each sec more particles hit container walls - greater change in velocity or momentum - greater force on walls

Question 10

Absolute zero?

Answer 10

the lowest possible temperature for a gas - the point at which no more heat can be removed.