Honors Chem Chapter 5

Front

What is the formula to calculate the temperature change of water when a hot object is placed in it?

Back

Temperature change (ΔT) = Final temperature - Initial temperature.

Front

Define 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 °C.

Front

What is the principle of conservation of energy in calorimetry?

Back

The principle states that the heat lost by the hot object is equal to the heat gained by the cold object.

Front

How do you calculate the heat gained or lost by a substance?

Back

Heat (q) = mass (m) × specific heat capacity (c) × temperature change (ΔT).

Front

What is the significance of ΔH in a chemical reaction?

Back

ΔH represents the change in enthalpy, indicating whether a reaction is exothermic (releases heat) or endothermic (absorbs heat).

Front

What does a negative ΔH value indicate?

Back

A negative ΔH value indicates that the reaction is exothermic, meaning it releases heat to the surroundings.

Front

What is the heat of formation?

Back

The heat of formation is the change in enthalpy when one mole of a compound is formed from its elements in their standard states.

Front

How do you determine the heat released in a reaction using stoichiometry?

Back

Use the stoichiometric coefficients from the balanced equation to relate moles of reactants/products to the heat change (ΔH).

Front

What is the relationship between moles and energy in thermochemical equations?

Back

The energy change (ΔH) is often given per mole of a substance in a balanced chemical equation.

Front

Define calorimetry.

Back

Calorimetry is the science of measuring the heat of chemical reactions or physical changes.