Front

What is the Heat of Reaction (ΔH) for an exothermic reaction?

Back

ΔH is negative, indicating that energy is released.

Front

What type of reaction usually feels hot?

Back

Exothermic reactions feel hot.

Front

What is an exothermic reaction?

Back

A reaction that releases energy, usually in the form of heat.

Front

What is an endothermic reaction?

Back

A reaction that absorbs energy from its surroundings.

Front

What happens to energy in an exothermic reaction?

Back

Energy is released into the surroundings.

Front

What happens to energy in an endothermic reaction?

Back

Energy is absorbed from the surroundings.

Front

Give an example of an exothermic reaction.

Back

Combustion of fuels, such as burning wood or gasoline.

Front

Give an example of an endothermic reaction.

Back

Photosynthesis: @@6 ext{CO}_2 + 6 ext{H}_2 ext{O} + ext{Energy} ightarrow ext{C}_6 ext{H}_{12} ext{O}_6 + 6 ext{O}_2@@.

Front

What is the significance of ΔH in chemical reactions?

Back

ΔH indicates whether a reaction is exothermic (negative ΔH) or endothermic (positive ΔH).

Front

How can you identify an exothermic reaction from a chemical equation?

Back

Look for products that have lower energy than reactants, indicating energy release.