Chemistry - Enthalpy

Front

What is Enthalpy?

Back

Energy stored in the chemical bonds in a substance.

Front

What does a negative enthalpy change indicate?

Back

The reaction releases energy to the surroundings.

Front

How do you calculate the enthalpy change of a reaction?

Back

ΔH = ΔH_products - ΔH_reactants.

Front

In an exothermic reaction, where is the heat energy found?

Back

On the products side of the equation.

Front

What happens to the temperature of the surroundings in an exothermic reaction?

Back

The temperature of the surroundings rises.

Front

What is the enthalpy change for an endothermic reaction?

Back

It is positive, indicating energy is absorbed from the surroundings.

Front

What is the significance of ΔH in a chemical reaction?

Back

It represents the change in enthalpy during the reaction.

Front

What is the relationship between enthalpy and temperature?

Back

Enthalpy is a measure of energy content, while temperature measures the average kinetic energy of particles.

Front

What is the standard enthalpy of formation?

Back

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

Front

What does it mean if a reaction has a ΔH of +50 kJ?

Back

The reaction is endothermic, absorbing 50 kJ of energy.