Introduction to Equilrium

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.

This symbol indicates that a reaction is ____________

• reversible
• irreversible

Tags

NGSS.HS-PS1-6

Why is equilibrium called a dynamic state?

• Chemists try to convert as much reactants as possible into products.

• Once equilibrium is achieved, the forward and reverse reactions do not stop.

• Once equilibrium is achieved, the forward and reverse reactions stop.

• All chemical reactions are considered to be reversible under suitable conditions.

Forward reaction is

• Reactants to products (left to right)

• Products to reactants (right to left)

• Always reversible

• Always endothermic

2A + 3B  <---->  2AB
The forward reaction forms the substance __________.

• A
• B
• AB
• A + B

Tags

NGSS.HS-PS1-2

2A + 3B  <---->  2AB
The reverse reaction forms the substance __________.

• A
• B
• AB
• A + B

At what time (in seconds) is equilibrium established?

• 0 seconds
• 1 second
• 5 seconds
• 10 seconds

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

• Forward reaction rate is faster than the reverse and concentrations are equal
• Forward and reverse reaction rates are equal and concentration is constant
• Forward and revers reaction rates are equal and concentration is equal
• Forward reaction rate is faster than the reverse and concentration is equal

Tags

NGSS.HS-PS1-6

NGSS.HS-PS1-5

When writing an endothermic reaction, heat energy is stated as a

• product

• catalyst

• reactant

Which of the following is NOT true at equilibrium?

• The forward and reverse reactions proceed at the same rate.
• The concentrations of reactants and products do not change.
• The concentration of the reactants is equal to the concentration of the products.
• The forward and reverse reactions continue to occur.