C7: Endothermic and Exothermic Reactions

What is the definition of an endothermic reaction?

• Absorbs heat from its surroundings

• Does not involve any heat exchange

• Releases heat to its surroundings

• Only occurs in living organisms

Explain in your own words what happens in an endothermic reaction.

• In an endothermic reaction, energy is absorbed from the surroundings.

• Endothermic reactions do not involve any energy changes.

• In an endothermic reaction, energy is released to the surroundings.

• Endothermic reactions only occur in living organisms.

Why do endothermic reactions feel cold to the touch?

• Endothermic reactions release heat to their surroundings

• Endothermic reactions absorb heat from their surroundings.

• Endothermic reactions have no effect on temperature

• Endothermic reactions create heat within themselves

What is the definition of an exothermic reaction?

• A chemical reaction that only releases energy in the form of sound.

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

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

• A chemical reaction that has no effect on energy.

Describe what occurs during an exothermic reaction.

• Energy is released in the form of heat or light.

• No energy is involved in the reaction.

• Energy is absorbed in the form of heat or light.

• The reaction only occurs in living organisms.

Why do exothermic reactions feel warm to the touch?

• Exothermic reactions absorb heat energy.

• Exothermic reactions release heat energy.

• Exothermic reactions have no effect on temperature.

• Exothermic reactions produce cold temperatures.

How do endothermic and exothermic reactions differ?

• Endothermic reactions absorb heat from the surroundings, while exothermic reactions release heat to the surroundings.

• Endothermic reactions and exothermic reactions both release heat to the surroundings.

• Endothermic reactions release heat to the surroundings, while exothermic reactions absorb heat from the surroundings.

• Endothermic reactions and exothermic reactions both absorb heat from the surroundings.

In what way are endothermic and exothermic reactions similar?

• They both require a catalyst to occur.

• They both involve the exchange of energy with the surroundings.

• They both occur only in living organisms.

• They both involve the release of energy to the surroundings.

Explain the energy changes in an endothermic reaction.

• Energy is converted into mass in an endothermic reaction.

• There is no change in energy in an endothermic reaction.

• Energy is absorbed from the surroundings, causing the surroundings to become cooler.

• Energy is released to the surroundings, causing the surroundings to become warmer.

Describe the energy changes in an exothermic reaction.

• Energy is released to the surroundings

• No energy changes occur

• Energy is converted into matter

• Energy is absorbed from the surroundings