Understanding Heat and Specific Heat

What is the definition of specific heat?

• The temperature at which a substance changes its state.

• The heat required to change a substance from solid to liquid.

• The total heat energy contained in a substance.

• The amount of heat required to raise the temperature of one unit mass of a substance by one degree Celsius.

How do you calculate heat transfer?

• Q = mc^2

• Q = mΔT

• Q = mgh

• Q = mcΔT

Explain the difference between heat capacity and specific heat.

• Heat capacity is only relevant for gases, while specific heat applies to liquids and solids.

• Specific heat is the total heat an object can hold, while heat capacity is per unit mass.

• Heat capacity measures temperature change, while specific heat does not.

• Heat capacity is for an object, while specific heat is for a unit mass of a substance.

What is latent heat?

• Latent heat is the heat required to increase the temperature of a substance.

• Latent heat is the energy released during a chemical reaction.

• Latent heat is the heat required for a substance to change its phase.

• Latent heat is the temperature at which a substance boils.

Define specific latent heat.

• Specific latent heat is the heat required to change the state of a unit mass of a substance at constant temperature.

• Specific latent heat is the heat needed to dissolve a unit mass of a substance.

• Specific latent heat is the heat required to raise the temperature of a substance.

• Specific latent heat is the energy released when a substance cools down.

What units are used to measure specific heat?

• J/g·°C

• cal/kg·°F

• kJ/mol·K

• J/kg·°C or J/kg·K

What happens to the temperature of a substance during a phase change?

• The temperature fluctuates during a phase change.

• The temperature decreases during a phase change.

• The temperature remains constant during a phase change.

• The temperature increases during a phase change.

How does specific heat relate to energy conservation?

• Specific heat only applies to gases, not liquids or solids.

• Specific heat has no impact on energy transfer.

• Specific heat relates to energy conservation by determining how much energy a substance can store or release during temperature changes.

• Energy conservation is unrelated to temperature changes.

How does the specific latent heat of fusion differ from that of vaporization?

• The specific latent heat of fusion is for boiling, while that of vaporization is for melting.

• Both specific latent heats refer to the same phase change from solid to gas.

• The specific latent heat of fusion is higher than that of vaporization.

• The specific latent heat of fusion is for melting (solid to liquid), while that of vaporization is for boiling (liquid to gas).

Given that SPECIFIC LATENT HEAT OF FUSION (lF) of ice =  3.4 x 10^5 j kg-1

SPECIFIC LATENT HEAT OF VAPORIZATION (lv) of water =  2.3 x 10^6 j kg-1

How much heat is required to convert 0.01 kg of ice at 0 k to water 0 k ?

• 2500 J
• 5000 J
• 1500 J
• 3400 J