Thermochemistry

Front

What is thermochemistry?

Back

Thermochemistry is the study of the heat energy associated with chemical reactions and changes of state.

Front

Define endothermic reaction.

Back

An endothermic reaction is a chemical reaction that absorbs heat from its surroundings.

Front

Define exothermic reaction.

Back

An exothermic reaction is a chemical reaction that releases heat to its surroundings.

Front

What is specific heat capacity?

Back

Specific heat capacity is the amount of heat required to raise the temperature of 1 gram of a substance by 1 degree Celsius.

Front

What is the formula to calculate heat absorbed or released?

Back

q = m × c × ΔT, where q is heat, m is mass, c is specific heat, and ΔT is the change in temperature.

Front

What is the heat of fusion (H_fus)?

Back

The heat of fusion is the amount of heat required to convert a unit mass of a solid into a liquid at its melting point.

Front

What is the heat of vaporization (H_vap)?

Back

The heat of vaporization is the amount of heat required to convert a unit mass of a liquid into a gas at its boiling point.

Front

How do high temperatures and low pressures affect phase changes?

Back

High temperatures and low pressures typically favor the gas phase.

Front

Calculate the heat absorbed when 60 grams of water boils to steam.

Back

Heat absorbed = mass × H_vap = 60 g × 2260 J/g = 135,600 J.

Front

What is the specific heat of aluminum?

Back

The specific heat of aluminum is 0.904 J/g°C.