Heat Capacity & Gas Laws

A 2 kg mass of Copper is heated for 40 s by a heater that produces 100 J/s. The specific heat capacity of Copper is 400 J/(kg K). What is the rise in temperature?

• 5 K
• 10 k
• 20 k
• 50 k

The diagram shows the levels X and Y in a liquid manometer when the gas tap is opened. What is the pressure of the gas in the cylinder?

• 18 cm of liquid below atmospheric pressure
• 9 cm of liquid below atmospheric pressure
• 9 cm of liquid above atmospheric pressure
• 18 cm of liquid above atmospheric pressure

A substance consists of particles that are close together and moving past each other at random. The average speed of the particles is gradually increasing. What best describes the substance?

• A liquid being boiled to form a gas
• A liquid being heated
• A solid being heated
• A solid being melted to form a liquid

Diagram 1 shows some air trapped in a cylinder. Diagram 2 shows the same air after the piston has been pushed in slowly. The air in Diagram 1 is at atmospheric pressure PA. What is the pressure of the air in Diagram 2?

• 6/10 * PA
• PA
• 10/6 * PA
• 60 * PA

Heat energy is supplied at the same rate to 100 g of paraffin and to 100 g of water in similar containers. Why does the temperature of paraffin rise more quickly?

• The paraffin has a larger specific heat capacity than water
• The paraffin has a smaller specific heat capacity than water
• The paraffin is less dense than water
• The paraffin is more dense than water

Some ice cubes are taken from a deep-freezer and placed in a metal container. The container is heated at a constant rate and readings of temperature and time are taken. The results are recorded on a graph as shown. Which temperature corresponds to 0 degrees celcius?

• A
• B
• C
• D

A substance that is originally a solid is heated strongly for some time. At one stage, the energy given to the substance is used as latent heat of vaporization. At this stage, what change does the energy cause?

• It breaks the bonds holding the molecules together. Molecules escape from the liquid
• It breaks the bonds holding the molecules together. The solid becomes liquid
• It makes the molecules move faster and so the temperature rises
• It makes the molecules move faster but there is still a strong attraction between them

A fixed mass of gas at constant temperature is compressed to reduce its volume. How do the molecules of gas now strike the walls of the container?

• Less often than before with a higher velocity
• Less often than before with the same velocity
• More often than before with a higher velocity
• More often than before with the same velocity

Some gas is trapped in a large syringe by a piston. The atmospheric pressure 100 kPa. The pressure gauge indicates that the gas pressure is 200 kPa above atmospheric pressure. The piston moves outwards and the volume of the trapped gas doubles. The temperature remains constant. What is the new gas pressure?

• 100 kPa
• 150 kPa
• 200 kPa
• 400 kPa

A block of metal has a mass of 2 kg. Its specific heat capacity is 800 J/(kgK). The block is supplied with 2400 J of energy. What is the change in temperature?

• 0.17 K
• 0.67 K
• 1.5 K
• 6.0 K