OTHER KNOWLEDGE (exemplar answers)

Question 1

How do you convert from m^2 to cm^2?

Answer 1

x 10,000

Question 2

How do you convert from cm^2 to m^2?

Answer 2

x 0.0001

Question 3

Explain where in water will pressure be higher, at the top or bottom? (exemplar answer)

Answer 3

The bottom because there will be a greater mass of water above. Therefore there will be a more force and so the pressure will be greater.

Question 4

TRUE OR FALSE: the force in water acts equally in all directions

Answer 4

TRUE

Question 5

How is pressure exerted in a gas? (exemplar answer)

Answer 5

1. Gas particles collide with the walls of a container because of their fast, random movement.
2. When particles collide with the walls, they exert a force.
3. As shown in the equation P=F/A, the force causes a pressure.

Question 6

What are three factors affecting the pressure of gas?

Answer 6

1. speed (temperature)
2. NO. particles
3. Volume of container

Question 7

What is the definition of temperature? (exemplar)

Answer 7

: proportional to the average kinetic energy of all particles.

Question 8

What is the definition of heat? (exemplar)

Answer 8

Total kinetic energy of all particles in the substance

Question 9

What happens when we change the volume of a container?

Answer 9

1. Assuming the temperature is constant, the speed of particles will remain the same.
2. But because there is a smaller volume, the particles will collide more frequently with the walls.
3. This creates a greater force acting on the container.
4. So as P=F/A, the pressure increases.

Question 10

Why does an increase in temperature lead to a higher volume?

Answer 10

1. When a gas increases in temperature, the kinetic energy increases.
2. This means the particles move faster and become more widely spaced.
3. Therefore they occupy a larger area.