Thermochemistry Review

Front

What is thermochemistry?

Back

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

Front

What is the formula to calculate the change in temperature when energy is added?

Back

The formula is ΔT = q / (m * c), where ΔT is the change in temperature, q is the heat added, m is the mass, and c is the specific heat capacity.

Front

What is the specific heat capacity of water?

Back

The specific heat capacity of water is 4.18 J/g°C.

Front

What is the boiling point of water at standard atmospheric pressure?

Back

The boiling point of water at standard atmospheric pressure is 100°C.

Front

What is ΔH in thermochemistry?

Back

ΔH is the change in enthalpy, which represents the heat content of a system during a reaction.

Front

What does a negative ΔH value indicate?

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A negative ΔH value indicates that a reaction is exothermic, meaning it releases heat.

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What does a positive ΔH value indicate?

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A positive ΔH value indicates that a reaction is endothermic, meaning it absorbs heat.

Front

What is the formula for Gibbs free energy (ΔG)?

Back

ΔG = ΔH - TΔS, where ΔG is the change in Gibbs free energy, ΔH is the change in enthalpy, T is the temperature in Kelvin, and ΔS is the change in entropy.

Front

What is the heat of vaporization?

Back

The heat of vaporization is the amount of energy required to convert a unit mass of a liquid into vapor without a change in temperature.

Front

How much energy is required to boil 1 gram of water at 100°C?

Back

The energy required to boil 1 gram of water at 100°C is 2260 J.