Energy in Reactions Quiz

What type of reaction occurs when energy is absorbed, and specifically when heat is absorbed?

• Endergonic and Endothermic

• Endergonic and Exothermic

• Exergonic and Exothermic

• Exergonic and Endothermic

How does an increase in temperature affect the rate of a chemical reaction?

• It slows down the reaction by increasing activation energy.

• It increases the reaction rate by increasing particle collisions.

• It decreases the reaction rate by reducing particle collisions.

• It has no effect on the reaction rate.

Why does a higher concentration of reactants lead to a faster reaction rate?

• Because it changes the state of the reactants.

• Because it decreases the number of particle collisions.

• Because it reduces the energy required for the reaction.

• Because it increases the number of particle collisions.

What is the role of a catalyst in a chemical reaction?

• It increases the activation energy required for the reaction.

• It slows down the reaction rate.

• It decreases the activation energy required for the reaction.

• It acts as a reactant in the reaction.

How does increased pressure affect the rate of gaseous reactions?

• It increases the reaction rate by increasing particle collisions.

• It slows down the reaction by increasing activation energy.

• It has no effect on the reaction rate.

• It decreases the reaction rate by reducing particle collisions.