10 L115 Temperature and Changes of State

If you have 2 kg of a material, how much energy would be needed to raise its temperature by one degree Celsius compared to 1 kg?

• Twice as much

• Half as much

• The same amount

• Four times as much

When is energy absorbed during a change of state?

• When melting and evaporating

• When freezing and condensing

• When cooling and freezing

• When boiling and freezing

What is specific heat capacity?

• The heat required to change the state of a substance without changing its temperature.
• The total heat energy contained in a substance at a given temperature.
• Specific heat capacity is the heat required to raise the temperature of one kilogram of a substance by one degree Celsius.
• The amount of heat needed to cool a substance by one degree Celsius.

What is specific latent heat of fusion?

• The specific latent heat of fusion is the heat required to convert a liquid into a solid at constant temperature.
• The specific latent heat of fusion is the heat required to convert a unit mass of a solid into a liquid at constant temperature.
• The specific latent heat of fusion is the heat required to raise the temperature of a solid by one degree Celsius.
• The specific latent heat of fusion is the heat required to vaporize a liquid into a gas at constant pressure.

What is specific latent heat of vaporisation?

• The specific latent heat of vaporisation is the temperature at which a liquid boils.
• The specific latent heat of vaporisation is the heat energy needed to vaporise a unit mass of a liquid.
• The specific latent heat of vaporisation is the energy released when a gas condenses into a liquid.
• The specific latent heat of vaporisation is the heat energy required to freeze a unit mass of a liquid.

Why does the temperature stay constant during a change of state?

• The temperature stays constant during a change of state because energy is used to change the state rather than increase the temperature.
• The temperature fluctuates during the change of state.
• Energy is released to change the state, raising the temperature.
• The temperature increases as the state changes.

How can you tell there is a change of state happening on a graph for time vs temperature?

• A horizontal line or plateau on the graph indicates a change of state.
• A fluctuating line suggests a change of state.
• A downward trend shows a change of state.
• A steep slope indicates a change of state.

What happens to the kinetic energy of the particles in a solid when the temperature increases?

• The kinetic energy of the particles in a solid increases when the temperature increases.
• The kinetic energy of the particles decreases when the temperature increases.
• The kinetic energy of the particles remains constant regardless of temperature changes.
• The kinetic energy of the particles in a solid is unaffected by temperature changes.

What is internal energy?

• Internal energy = kinetic energy + potential energy

• Internal energy = thermal energy + potential energy

• Internal energy = potential energy + chemical energy

• Internal energy = kinetic energy + thermal energy

If the change of state takes a long time, does it need lots of energy to take place, or not much energy?

• It needs lots of energy.
• It needs energy only for a brief moment.
• It requires energy only at the beginning.
• It needs minimal energy.