Endothermic vs Exothermic Reactions

What is an endothermic reaction?

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

• A reaction that absorbs energy from its surroundings.

• A reaction that occurs without any energy change.

• A reaction that produces light.

What is an exothermic reaction?

• A reaction that absorbs energy from its surroundings.

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

• A reaction that requires a catalyst to proceed.

• A reaction that occurs only in the presence of light.

Which of the following is a characteristic of endothermic reactions?

• They feel warm to the touch.

• They feel cold to the touch.

• They produce light.

• They produce sound.

Which of the following is a characteristic of exothermic reactions?

• They absorb light.

• They feel cold to the touch.

• They release heat.

• They require energy input to start.

In a chemical reaction diagram, how is an endothermic reaction typically represented?

• The products have lower energy than the reactants.

• The products have higher energy than the reactants.

• The energy level remains constant.

• The energy level decreases and then increases.

In a chemical reaction diagram, how is an exothermic reaction typically represented?

• The products have higher energy than the reactants.

• The products have lower energy than the reactants.

• The energy level remains constant.

• The energy level increases and then decreases.

Which of the following reactions is an example of an endothermic process?

• Combustion of wood.

• Photosynthesis in plants.

• Freezing of water.

• Condensation of steam.

Which of the following reactions is an example of an exothermic process?

• Melting of ice.

• Evaporation of water.

• Combustion of gasoline.

• Electrolysis of water.

Compare endothermic and exothermic reactions in terms of energy flow.

• Endothermic reactions release energy, while exothermic reactions absorb energy.

• Endothermic reactions absorb energy, while exothermic reactions release energy.

• Both types of reactions absorb energy.

• Both types of reactions release energy.

Which of the following best describes the energy change in an exothermic reaction?

• Energy is absorbed from the surroundings.

• Energy is released to the surroundings.

• Energy remains constant.

• Energy is converted into mass.