REVIEW U3: Heat & Phase Changes

Front

What is the definition of heat?

Back

Heat is the energy transferred between two systems or a system and its surroundings due to a temperature difference.

Front

What is the melting point?

Back

The melting point is the temperature at which a solid becomes a liquid at a given pressure.

Front

What is the formula to calculate heat energy required to raise the temperature of any substance?

Back

Front

What is the heat of reaction (ΔH)?

Back

The heat of reaction (ΔH) is the amount of heat absorbed or released during a chemical reaction at constant pressure.

Front

What happens during a phase change?

Back

During a phase change, a substance changes from one state of matter to another (e.g., solid to liquid) without changing its temperature.

Front

What is the difference between endothermic and exothermic reactions?

Back

Endothermic reactions absorb heat from the surroundings, while exothermic reactions release heat to the surroundings.

Front

What is specific heat capacity?

Back

Specific heat capacity is the amount of heat required to raise the temperature of one gram of a substance by one degree Celsius.

Front

What is the significance of the B-C and D-E segments in a heating curve?

Back

The B-C and D-E segments represent phase changes where the substance is changing state (e.g., melting or boiling) without a change in temperature.

Front

What is the relationship between temperature and kinetic energy?

Back

Temperature is a measure of the average kinetic energy of the particles in a substance; as temperature increases, kinetic energy increases.

Front

What is latent heat?

Back

Latent heat is the heat absorbed or released during a phase change without a change in temperature.