Lesson 9.2 (38): Reaction Energy Vocab + Mastery

After learning Lesson 38: Reaction Energy, you should be able to define 'Potential energy'. What does it refer to?

• The energy released during a chemical reaction

• The energy required to start a reaction

• The energy stored in an object due to its position or arrangement

• The energy absorbed during a chemical reaction

What term is used to describe a reaction that releases energy?

• Endothermic

• Potential energy

• Heat of Reaction

• Exothermic

Which term refers to a reaction that absorbs energy?

• Exothermic

• Potential energy

• Endothermic

• Heat of Reaction

What are the substances called that are present before a chemical reaction takes place?

• Products

• Potential energy

• Endothermic

• Reactants

What are the substances called that are formed as a result of a chemical reaction?

• Reactants

• Potential energy

• Products

• Endothermic

What is the term for the energy change that occurs during a chemical reaction?

• Potential energy

• Exothermic

• Endothermic

• Heat of Reaction

What does potential energy in a substance depend on?

• The temperature of the substance

• The structure and composition of the substance

• The phase of the substance (solid, liquid, gas)

• The amount of the substance

What is the heat of reaction (ΔH)?

• The temperature change during a reaction

• The amount of heat absorbed by the reactants

• The overall or net energy absorbed or released during a reaction

• The energy required to start a reaction

What does a negative heat of reaction (-ΔH) indicate? (2 answers)

• The products of the reaction have more energy than the reactants

• The reaction is endothermic because heat is absorbed

• The products of the reaction have less energy than the reactants

• The reaction is exothermic because heat is released

What does a positive heat of reaction (+ΔH) mean? (2 answers)

• The products of the reaction have less energy than the reactants

• The reaction is exothermic because heat is released

• The products of the reaction have more energy than the reactants

• The reaction is endothermic because heat is absorbed