Question

reading science

1. what type of chemical reaction occurs when more energy is released during the chemical reaction than is needed to start the chemical reaction?

a. a bond energy reaction
b. an exothermic reaction
c. an endothermic reaction
d. a simple chemical reaction

1. what type of chemical reaction occurs when less energy is released during the chemical reaction than is needed to start the chemical reaction?

a. a bond energy reaction
b. an exothermic reaction
c. an endothermic reaction
d. a simple chemical reaction

1. some chemical reactions release energy. others store energy. what important chemical reaction stores energy?

a. the burning of fossil fuels
b. combustion reactions
c. photosynthesis
d. digestion

Explanation:

1. Reactions that release more energy than is required to start them are defined as exothermic, as they release net energy.
2. Reactions that release less energy than is needed to initiate them absorb net energy, which is the definition of endothermic.
3. Photosynthesis stores energy from sunlight in chemical bonds of glucose, while the other options release energy.

Answer:

1. B. An exothermic reaction
2. C. An endothermic reaction
3. C. Photosynthesis