Equilibrium in Chemical Reactions

What is the definition of 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

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.

Tags

NGSS.HS-PS1-6

When the forward and reverse reactions are occurring at the same rate, the reaction is said to be at:

• Chemical equilibrium

• Chemical reaction

• Chemical constant

• Chemical peace

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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

What are the two factors to look for when determining if the reaction is at equilibrium?

• The concentrations of the reactants and products are equal

• Forward and reverse reaction rates are the same

• Forward reaction rate is faster than the reverse and concentration is equal

Tags

NGSS.HS-PS1-6

This symbol indicates that a reaction is ____________

• reversible

• irreversible

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NGSS.HS-PS1-6

For the reaction... heat + N_2(g) + O_2(g) <−> 2NO_(g) If the heat is removed to the chemical system, the equilibrium will _______.

• shift to the left

• shift to the right

• not shift

Tags

NGSS.HS-PS1-6

What happens to the equilibrium if we add methane (CH_4)?

• It shifts left, towards the reactants

• It shifts right, towards the products

• It does not shift

Tags

NGSS.HS-PS1-6

What happens to the equilibrium if we add hydrogen (H_2)?

• It shifts left, towards the reactants

• It shifts right, towards the products

• It does not shift

Tags

NGSS.HS-PS1-6

What happens to the equilibrium if we remove water (H_2O)?

• It shifts left, towards the reactants

• It shifts right, towards the products

• It does not shift

Tags

NGSS.HS-PS1-6