IGCSE U5 thermal effects

Capacity refers to the:

• a) The ability of an object to hold heat
• b) The amount of heat required to raise the temperature of a substance
• c) The volume of a container
• d) The ability of an object to conduct heat

Change in thermal energy is a result of:

• a) A change in temperature
• b) The transfer of heat from one object to another
• c) A change in the state of matter
• d) A change in the internal energy of a system

Chemical changes involve:

• a) Changes in temperature
• b) Changes in the physical properties of a substance
• c) Changes in the chemical composition of a substance
• d) Changes in the density of a substance

Condensation is the process by which:

• a) A solid changes directly into a gas
• b) A gas changes directly into a solid
• c) A liquid changes into a gas
• d) A gas changes into a liquid

Density is defined as:

• a) The mass per unit volume of a substance
• b) The weight of a substance
• c) The volume per unit mass of a substance
• d) The temperature of a substance

Evaporation is the process by which:

• a) A liquid changes into a gas at its boiling point
• b) A gas changes into a liquid
• c) A liquid changes into a gas at temperatures below its boiling point
• d) A solid changes into a gas

Freezing is the process by which:

• a) A liquid changes into a gas
• b) A gas changes into a liquid
• c) A liquid changes into a solid
• d) A solid changes into a liquid

Gas temperature is a measure of:

• a) The kinetic energy of gas molecules
• b) The volume of a gas
• c) The pressure of a gas
• d) The density of a gas

Internal energy refers to the:

• a) Total energy of a system
• b) Energy stored in chemical bonds
• c) Energy transferred as heat
• d) Energy associated with motion

Latent heat is the heat:

• a) Required to raise the temperature of a substance
• b) Released by a substance as it cools
• c) Absorbed or released during a change in state
• d) Transferred by conduction