Quizizz: Equilibrium Introduction

This symbol indicates that a reaction is _____

• reversible

• irreversible

• endothermic

• exothermic

During equilibrium, the rates of the forward and the reverse reactions are ________

• equal

• slow

• constant

• fast

In a reversible chemical reaction, what is equal when the reaction is at equilibrium?

• concentration of reactants and concentration of products

• potential energy of reactants and potential energy of products

• activation energy of reactants and activation energy of products

• rate at which reactants are formed and rate at which products are formed

If a reaction is reversible and has reached equilibrium, what can be said about the amounts of reactants and products?

• They are equal!

• They are constant!

• The amount of reactants is greater than the amount of products!

• The amount of products is greater than the amount of reactants!

Which statement correctly describes the potential energy diagram pictured?

• Both forward and reverse reactions are endothermic.

• Both forward and reverse reactions are exothermic.

• The forward reaction is endothermic and the reverse reaction is exothermic.

• The forward reaction is exothermic and the reverse reaction is endothermic.

When the system X + 2 Y <=> Z has reached equilibrium, which of the following is TRUE?

• Forward reaction and reverse reaction stop.

• Forward reaction has sped up and reverse reaction has slowed down.

• Forward and reverse reactions occur at the same rate.

• Forward reaction has slowed down and reverse reaction has sped up.

Which of the following is NOT true at equilibrium?

• The concentrations of reactants and products do not change.

• The forward and reverse reactions proceed at the same rate.

• The concentration of the reactants is equal to the concentration of the products.

• The forward and reverse reactions continue to occur.

How can the system pictured reach a state of equilibrium?

• Add more reactants

• Add more products

• Close the container

• Add a catalyst

A chemical reaction has reached equilibrium when . . .

• the reverse reaction begins

• the forward reaction stops

• the concentrations of the reactants and products become equal

• the concentrations of the reactants and products become constant

Given the system at chemical equilibrium:

2O₃ (g) <---> 3O₂ (g)

The concentration of O₃ and O₂ must be . . .

• constant

• equal

• increasing

• decreasing