Chemical Reactions Energy Level Diagram Assessment

What does an energy level diagram represent in a chemical reaction?

• The physical state of the reactants and products

• The energy changes that occur during the reaction

• The duration of the reaction

• The temperature change during the reaction

What does the difference in energy between the reactants and products represent in an energy level diagram?

• The amount of energy transferred to or absorbed from the surroundings

• The amount of energy lost as heat to the surroundings

• The change in mass of the reactants and products

• The speed of the chemical reaction

In an endothermic reaction, how does the energy level of the products compare to the reactants?

• The products are at a lower energy level than the reactants

• The products are at the same energy level as the reactants

• The products are at a higher energy level than the reactants

• The energy level of the products is unrelated to the reactants

What is represented as ΔH on the energy level diagram for an endothermic reaction?

• The activation energy required for the reaction

• The total energy of the reactants

• The amount of heat energy released to the surroundings

• The amount of heat energy absorbed from the surroundings

What happens to the energy level of the products in an exothermic reaction compared to the reactants?

• The products are at a higher energy level than the reactants.

• The products are at the same energy level as the reactants.

• The products are at a lower energy level than the reactants.

• The energy level of the products is not related to the energy level of the reactants.

In an exothermic reaction, the difference in energy between the reactants and products is represented by what symbol on the energy level diagram?

• ΔR

• ΔP

• ΔH

• ΔE

What is the process called when atoms in the reactants are rearranged to form new products?

• Bond-breaking

• Bond-making

• Both A and B

• Neither A nor B

Which process is endothermic during a chemical reaction?

• Bond-making

• Bond-breaking

• Both A and B

• Neither A nor B

What determines whether a chemical reaction is exothermic or endothermic?

• The type of reactants involved

• The temperature at which the reaction occurs

• The amount of energy needed to break bonds compared to the energy released when new bonds are made

• The color change during the reaction

What is the result if the amount of energy required to break the bonds is less than the amount of energy released when new bonds are made?

• The reaction will be endothermic.

• The reaction will be exothermic.

• The reaction will not occur.

• The reaction will be reversible.