Unit 1 - Part 2: Lesson 3 - Energy Changes in Chemical Reactions

Front

What happens to energy during a chemical reaction in a cold pack?

Back

Energy is absorbed from the surroundings.

Front

How does increasing reactant concentration affect the reaction rate?

Back

The reaction rate increases.

Front

Where does the energy in a chemical reaction primarily come from?

Back

The chemical bonds of atoms.

Front

What type of reaction absorbs more energy to break bonds than it releases?

Back

Endothermic reaction.

Front

What energy source do plants primarily use in photosynthesis?

Back

Sunlight.

Front

Define an exothermic reaction.

Back

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

Front

What is the role of activation energy in a chemical reaction?

Back

It is the minimum energy required for a reaction to occur.

Front

What is a catalyst?

Back

A substance that increases the rate of a chemical reaction without being consumed.

Front

Explain the difference between endothermic and exothermic reactions.

Back

Endothermic reactions absorb energy; exothermic reactions release energy.

Front

What is the law of conservation of energy in chemical reactions?

Back

Energy cannot be created or destroyed, only transformed.