 Edexcel GCSE Pressure

Page 1

Q1+2. The diagram shows gas molecules trapped in a container. The molecules (particles) are moving very fast. they collide with the walls of the container producing a pressure. Author:yelod - wikimedia commons - edited

1. Which of these statements best describes the effect of this pressure on the container?

• A. The pressure produces a force parallel to the surface of the container.
• B. The pressure produces a force at right angles to the surface of the container.
• C. The pressure produces energy parallel to the surface of the container.
• D. The pressure produces energy at right angles to the surface of the container.

2. If the container volume is increased, without changing the temperature of the gas, what happens to pressure of the gas?

• A. The pressure increases because the particles move and collide faster.
• B. The pressure increases because the particles hit the sides of the container more frequently.
• C. The pressure decreases because the particles move and collide more slowly.
• D. The pressure decreases because the particles hit the sides of the container less frequently.

3-6. A simple experiment is carried out using a gas syringe:

A pressure sensor is attatched to the end of the syringe, and the pressure reading taken as the gas volume is reduced. The reading is taken after a while to allow the temperature to remain constant. The results are shown in the green table below.

The formula linking pressure and volume is:

p V = constant Database Center for Life Science (DBCLS)

3. What are the likely missing volume units labelled X in the results table below?

• A) cm2
• B) cm3
• C) m2
• D) m3

4-6. What are the missing values in the results table shown here?

Volume

('X')

Pressure

(kPa)

6
100
120
3
2.5

7. Which of these statements best describes what happens to a gas trapped inside a bicycle pump when it is pushed inwards rapidly, reducing the volume of the gas?

• A. The temperature decreases due to work being done on the gas.
• B. The temperature increases due to work being done on the gas.
• C. The temperature decreases due to a force being applied on the gas.
• D. The temperature increases due to a force being applied on the gas.

When divers go deep under water the pressure increases, as per this formula:

Pressure (Pa) = height (m) x density (kg/m3) x g (N/kg)

What are the missing values in this table used for divers in a lake? (Density of water= 1000 kg/m3)

 Pressure due to liquid Depth 8. 400 000 Pa ? 4m 40m 400m 4000m 9. ? 250Pa 2500Pa 25000Pa 250000Pa 250cm