Equilibrium

2A + 3B ↔ 2AB

The forward reaction forms the substance(s) __________.

• A

• B

• AB

• A + B

2A + 3B ↔ 2AB

The forward reaction points towards the __________.

• left

• right

• up

• down

What kind of equilibrium does the reaction below show?
H_2(g) +I_2(g) ↔ 2HI_(g)

• Heterogeneous equilibrium, all the reactants and products are in the same physical state.
• Homogeneous equilibrium, all the reactants and products are in the same physical state.
• Heterogeneous equilibrium, the reactants and products are present in more than one physical state
• Homogeneous equilibrium, the reactants and products are present in more than one physical state

Define chemical equilibrium.

• A reaction is reversible.
• The concentration of the reactants is equal to the concentration of the products.
• The rate of a forward reaction is equal to the rate of the reverse reaction.
• The reaction stops and no further change in concentration occurs.

Tags

NGSS.HS-PS1-6

Why is equilibrium called a dynamic state?

• Chemists try to convert as much reactants as possible into products.
• The reactions at equilibrium continue to take place once equilibrium is established.
• The products of a forward reaction are favored, so equilibrium lies to the right.
• All chemical reactions are considered to be reversible under suitable conditions.

Tags

NGSS.HS-PS1-6

If a reaction is reversible, what are the relative amounts of reactant and product at the end of the reaction?

• some product; some reactant

• no reactant; all product

• The relationship between reactants and products cannot be determined.

• no product; all reactant

By applying Le Chatelier's principle to a reaction that has come to equilibrium, you can make the reaction

• run to completion.

• reach a new chemical equilibrium.

• produce more reactants.

• All of the above

What happens to a reaction at equilibrium when more reactant is added to the system?

• The reaction makes more reactants.

• The reaction is unchanged.

• The answer cannot be determined.

• The reaction makes more products.

A reaction in which products can react to re-form reactants is

• reversible.

• buffered.

• reforming.

• impossible.

If a reaction system has come to equilibrium, it can be made to run to completion

• only if the temperature is low enough.

• only if it is not reversible.

• under no circumstances.

• by removing a product.