Endothermic and Exothermic Reactions

Front

What are endothermic processes?

Back

Endothermic processes are chemical reactions or physical changes that absorb heat from their surroundings, resulting in a decrease in temperature of the environment.

Front

What are exothermic processes?

Back

Exothermic processes are chemical reactions or physical changes that release heat into their surroundings, resulting in an increase in temperature of the environment.

Front

What is the significance of ΔH in chemical reactions?

Back

ΔH represents the change in enthalpy (heat content) during a reaction. A negative ΔH indicates an exothermic reaction, while a positive ΔH indicates an endothermic reaction.

Front

Give an example of an endothermic reaction.

Back

Baking bread and cooking an egg are examples of endothermic reactions, as they absorb heat during the process.

Front

Give an example of an exothermic reaction.

Back

Combustion of gasoline in a school bus is an example of an exothermic reaction, as it releases heat.

Front

In an endothermic reaction, heat is __________.

Back

absorbed.

Front

In an exothermic reaction, heat is __________.

Back

released.

Front

What happens to the temperature of the surroundings during an endothermic reaction?

Back

The temperature of the surroundings decreases as heat is absorbed by the reaction.

Front

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

Back

The temperature of the surroundings increases as heat is released by the reaction.

Front

What is an example of a physical change that is endothermic?

Back

Melting ice is an example of a physical change that is endothermic, as it absorbs heat from the environment.