Chemical Equilibrium

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-PS1-5

NGSS.HS-PS1-6

For the reaction...

SO₂ + O₂ ⇌ SO₃

If the concentration of SO₂ is increased, the equilibrium of the reaction will shift ___________.

• left

• right

• left and right

• neither left nor right

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6

For the reaction...

N_{2 (g)} + 3 H_2(g) ⇌ 2 NH_{3 (g)}

If the pressure in the system is increased, which substance(s) will increase in concentration?

• N₂

• H₂

• N₂ and H₂

• NH₃

Tags

NGSS.HS-PS1-6

2SO₂(g)+O₂(g)⇌2SO₃(g)
Removing O₂(g) will

• shift equilibrium right
• shift equilibrium left
• increase pressure
• have no change

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.

Tags

NGSS.HS-PS1-6

For the reaction...
heat  +  N₂  +  O₂  <−>  2NO
If the heat is added to the chemical system, the equilibrium will shift _______.

• left
• right
• left and right
• neither left nor right

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6

For the reaction...
H_{2 (g)}  + Cl_{2 (g)} <−>  2HCl _(g)  +  heat
If the temperature is cooled, the _________ reaction will be favored.

• forward
• reverse
• forward and reverse

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6

It is a chemical reaction where the reactants form products that, in turn, react together to give the reactants back.

• reversible reaction
• irreversible reaction
• decomposition reaction
• synthesis

Tags

NGSS.HS-PS1-6

Le Chatelier's Principle states that:

• a disturbing force must be applied to a system in order for it to reach equilibrium.

• when a system at equilibrium is disturbed, a new equilibrium constant is established.

• when a chemical system at equilibrium is disturbed, the system shifts in order to minimize the effect.

• when a chemical system is at equilibrium it is no longer possible to alter the system.

Tags

NGSS.HS-PS1-6

In which of the following systems would the number of molecules of the substances present at equilibrium NOT be shifted by a change in the pressure of the system?

• CO_(g) + NO_(g) ↔ CO_2(g) + ½N_2(g)

• N_2(g) + 3H_2(g) ↔ 2NH_3(g)

• N_2(g) + 2O_2(g) ↔ 2 NO_2(g)

• NO_(g) + O_3(g) ↔ NO_2(g) + O_2(g)