Introduction to Equilibria

2A + 3B  <---->  2AB
The forward reaction points towards the __________.

• left
• right
• up
• down

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

• A
• B
• AB
• A + B

A reaction is in a state of dynamic equilibrium when

• it is in an open system

• there is the same amount of product and reactant

• the forward and reverse rates are equal

• you change the temperature

Tags

NGSS.HS-PS1-6

What is the equilibrium expression for:
Fe₃O₄(s) + 4H₂(g) <--> 3Fe(s) + 4H₂O(g)

• ([Fe]³[H₂O]⁴ ) / ([Fe₃O₄][H₂]⁴)
• ([Fe₃O₄][H₂]⁴)/ ([Fe]³[H₂O]⁴)
• [H₂O]⁴ / [H₂]⁴
• ([Fe][H₂O]) / ([Fe₃O₄][H₂])

Tags

NGSS.HS-PS1-6

When K_eq > 1,

• There are more products than reactants when the reaction reached equilibrium.

• There are more reactants than products when the reaction reached equilibrium.

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

Tags

NGSS.HS-PS1-6

Keq < 1

• There are more products than reactants when the reaction reached equilibrium.

• There are more reactants than products when the reaction reached equilibrium.

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

Tags

NGSS.HS-PS1-6

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

What kind of equilibrium does the reaction below show?
CaCO_{3 (s)} ↔ CaO _(s) + CO_{2 (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

Tags

NGSS.HS-PS1-6

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.