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Question 9

A)Endothermic reactions absorb a lot of energy. Exothermic reactions give off a lot of energy. Which type of reaction has a higher activation energy? Which one takes more energy to break up the bonds of the reactants?(1 point)
Responses

Exothermic reactions have a higher activation energy. Endothermic reactions require more energy to break up the bonds of the reactants.
Exothermic reactions have a higher activation energy. Endothermic reactions require more energy to break up the bonds of the reactants.

Endothermic reactions have a higher activation energy. Exothermic reactions require more energy to break up the bonds of the reactants.
Endothermic reactions have a higher activation energy. Exothermic reactions require more energy to break up the bonds of the reactants.

Exothermic reactions have a higher activation energy. Exothermic reactions require more energy to break up the bonds of the reactants.
Exothermic reactions have a higher activation energy. Exothermic reactions require more energy to break up the bonds of the reactants.

Endothermic reactions have a higher activation energy. Endothermic reactions require more energy to break up the bonds of the reactants.
Endothermic reactions have a higher activation energy. Endothermic reactions require more energy to break up the bonds of the reactants.
Question 10
A)Why is thermal energy (heat) required to freeze ice into crystals?(1 point)
Responses

Heat must be released by the reactants and the products.
Heat must be released by the reactants and the products.

Heat must be absorbed by the reactants and the products.
Heat must be absorbed by the reactants and the products.

Heat must be released by the products in order to convert from the reactants.
Heat must be released by the products in order to convert from the reactants.

Heat must be absorbed by the products in order to convert from the reactants.

1 answer

Question 9:

The correct response is:

  • Endothermic reactions have a higher activation energy. Exothermic reactions require more energy to break up the bonds of the reactants.

Explanation:
Endothermic reactions typically require a higher activation energy because they need to absorb energy to break the bonds of the reactants and form the products, which often involves overcoming significant energy barriers. In contrast, exothermic reactions release energy when products form, indicating that the bond formation energy is greater than the bond breaking energy.

Question 10:

The correct response is:

  • Heat must be released by the products in order to convert from the reactants.

Explanation:
When ice freezes into crystals, thermal energy (heat) is released to the surroundings as the molecular motion decreases, allowing the water molecules to arrange themselves into a solid crystalline structure. Freezing is an exothermic process, where energy is released rather than absorbed.