6D Chemical Equilibrium

Given the equation representing a system at equilibrium:

N₂(g) + 3H₂(g) ⇌ 2NH₃(g)

Which statement describes this reaction at equilibrium?

• The concentration of N₂(g) decreases.

• The concentration of N₂(g) is constant.

• The rate of the reverse reaction decreases.

• The rate of the reverse reaction increases.

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6

What occurs when a reaction reaches equilibrium?

• The concentration of the reactants increases.

• The concentration of the products increases.

• The rate of the forward reaction is equal to the rate of the reverse reaction.

• The rate of the forward reaction is slower than the rate of the reverse reaction.

Tags

NGSS.HS-PS1-6

Which equation represents a chemical equilibrium?

• N₂(g) ⇌ N₂(g)

• 2NO₂(g) ⇌ N₂O₄(g)

• CO₂(g) ⇌ CO₂(g)

• NH₃(g) ⇌ NH₃(g)

Tags

NGSS.HS-PS1-6

When a chemical reaction is at equilibrium, the concentration of each reactant and the concentration of each product must be

• constant
• variable

• equal

• zero

Tags

NGSS.HS-PS1-6

Which statement describes a reaction at equilibrium?

• The mass of the products must equal the mass of the reactants.

• The entropy of the reactants must equal the entropy of the products.

• The rate of formation of the products must equal the rate of formation of the reactants.

• The number of moles of the reactants must equal the number of moles of the products

Tags

NGSS.HS-PS1-6

Given the equation representing a system at equilibrium:

N₂O₄(g) ⇌ 2NO₂(g).

Which statement describes the concentration of the two gases in this system?

• The concentration of N₂O₄(g) must be less than the concentration of NO₂(g).

• The concentration of N₂O₄(g) must be greater than the concentration of NO₂(g).

• The concentration of N₂O₄(g) and the concentration of NO₂(g) must be equal.

• The concentration of N₂O₄(g) and the concentration of NO₂(g) must be constant.

Tags

NGSS.HS-PS1-6

Given the reaction at equilibrium:

2SO₂(g) + O₂(g) ⇌ 2SO₃(g) + heat

Which change will shift the equilibrium to the right?

• adding a catalyst

• adding more O₂(g)

• decreasing the pressure

• increasing the temperature

Tags

NGSS.HS-PS1-6

Given the equilibrium reaction at constant pressure:

2HBr(g) + 17.4 kcal ⇌ H₂(g) + Br₂(g)

When the temperature is increased, the equilibrium will shift to the _____.

• right, and the concentration of HBr(g) will decrease

• right, and the concentration of HBr(g) will increase

• left, and the concentration of HBr(g) will decrease

• left, and the concentration of HBr(g) will increase

Tags

NGSS.HS-PS1-5

Given the reaction at equilibrium:

2SO₂(g) + O₂(g) ⇌ 2SO₃(g) + heat

Which change will shift the equilibrium to the right?

• decreasing [SO₂]

• decreasing the pressure

• increasing [O₂]

• increasing the temperature

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6

Given the reaction at STP and at equilibrium:

H₂(g) + Cl₂(g) ⇌ 2HCl(g).

Which change will result in an increase in the concentration of Cl₂(g)?

• decreasing the pressure of the system

• decreasing the concentration of HCl(g)

• increasing the concentration of H₂(g)

• increasing the concentration of HCl(g)

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6