11C Energy Changes in Chemical Reactions

Front

What is the symbol used to represent the heat energy change in a chemical equation?

Back

ΔH

Front

How is the energy change calculated in a chemical reaction?

Back

By taking the difference between the energy of the products and the energy of the reactants.

Front

What is the sign of the energy change for an endothermic reaction?

Back

+

Front

What is the general term used to describe the energy change that occurs in a chemical reaction?

Back

enthalpy

Front

Define exothermic reaction.

Back

A chemical reaction that releases energy in the form of heat or light.

Front

Define endothermic reaction.

Back

A chemical reaction that absorbs energy in the form of heat or light.

Front

What is activation energy?

Back

The minimum energy required for a chemical reaction to occur.

Front

What is the difference between exothermic and endothermic reactions?

Back

Exothermic reactions release energy, while endothermic reactions absorb energy.

Front

What is the role of catalysts in chemical reactions?

Back

Catalysts lower the activation energy, speeding up the reaction without being consumed.

Front

What does a negative ΔH indicate?

Back

A negative ΔH indicates that the reaction is exothermic.