7.3: Chemical Reactions Involve Energy Changes

A reaction in which energy is released is a(n)

• Physical reaction

• Exothermic Reaction

• Endothermic Reaction

A chemical reaction where energy is absorbed is a(n)

• Physical Reaction

• Exothermic Reaction

• Endothermic Reaction

An exothermic reaction is usually indicated by

• a decrease in temperature

• an increase in temperature

• an increase in number of products

Plants absorb and store some of the energy in sunlight through a series of reactions called

• Decomposition

• Combustion

• Photosynthesis

The energy needed to break reactants apart is known as

• bond energy

• endothermic energy

• catalytic energy

Methane reacts with Oxygen to create CO₂, Water, and heat. This is an example of

• An exothermic reaction

• An endothermic reaction

• A physical change

An endothermic reaction is usually indicated by

• an increase in temperature

• a decrease in temperature

• the presence of a catalyst

When new bonds are formed, energy is

• absorbed

• released

• gained

In a reaction between Baking Soda and Vinegar, the temperature decreases. This indicates

• An endothermic reaction

• An exothermic reaction

• A combustion reaction

In order to break bonds between atoms, energy must be

• absorbed

• lost

• released