Endothermic and Exothermic Reactions

Temperature changes are due to changes in ________

• Matter

• Energy

• Motion

• Bonds

Answer explanation

Temperature changes are due to changes in energy.

Tags

NGSS.HS-PS3-2

NGSS.HS-PS3-4

What is released to the environment when a chemical bonds are formed? (Choose all the correct answers)

• Energy

• Matter

• Light

• Heat

Answer explanation

When chemical bonds are formed, energy, light, and heat are released to the environment.

Tags

NGSS.HS-PS1-4

What type of reactions release more energy when the products form than is required to break the bonds?

• Exothermic Reactions

• Endothermic Reactions

• Chemical Reactions

• Physical Reactions

Answer explanation

Exothermic reactions release more energy when the products form than is required to break the bonds.

Tags

NGSS.HS-PS1-4

What happens to the surroundings in endothermic reactions?

• They get hotter

• They get colder

• No change

• Cannot be determined

Answer explanation

In endothermic reactions, the surroundings get colder.

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

What is the energy change in an exothermic reaction?

• Energy is absorbed

• Energy is released

• No energy change

• Cannot be determined

Answer explanation

In an exothermic reaction, energy is released.

Tags

NGSS.HS-PS1-4

What happens to the surroundings in exothermic reactions?

• They get hotter

• They get colder

• No change

• Cannot be determined

Answer explanation

In exothermic reactions, the surroundings get hotter.

Tags

NGSS.HS-PS1-4

What type of reactions require more energy to break the bonds than is released when the products form?

• Exothermic Reactions

• Endothermic Reactions

• Chemical Reactions

• Physical Reactions

Answer explanation

Endothermic reactions require more energy to break the bonds than is released when the products form.

Tags

NGSS.HS-PS1-4

Ms. Guadiamos combined baking soda and vinegar. It then formed water, carbon dioxide. Ms. Guadiamos measured the temperature of the and the surroundings got colder. What type of reaction was it?

• Exothermic Reaction

• Endothermic Reactions

• No reaction occurred (No chemical chang)

Answer explanation

The reaction between baking soda and vinegar is an endothermic reaction because the temperature of the surroundings decreases.

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

A hand warmer is exposed to air (oxygen) and suddenly increases in temperature?

What type of reaction occurred?

• Exothermic Reaction

• Endothermic Reaction

• No reaction occurred (no sign of chemical change)

Answer explanation

The sudden increase in temperature indicates an exothermic reaction, where heat is released. This is consistent with the correct choice, 'Exothermic Reaction'.

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

Ms. Guadiamos put steel wool in vinegar. It turned red, rust formed, and increased in temperature. What type of reaction occurred?

• Exothermic Reaction

• Endothermic Reaction

• No reaction happened (No Chemical Change)

Answer explanation

The reaction between steel wool and vinegar is an exothermic reaction, as indicated by the formation of rust, change in color, and increase in temperature.

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-4