Chemical Equilibrium Worksheet

What is the definition of chemical equilibrium?

• A. A state where reactants are completely converted to products

• B. A state where the concentrations of reactants and products remain constant over time

• C. A reaction that stops when equilibrium is reached

• D. A reaction that always favors the reactants

Tags

NGSS.HS-PS1-6

Which of the following correctly describes the equilibrium constant (K)?

• It changes with concentration changes

• It depends only on temperature

• It is affected by adding a catalyst

• It determines the rate of reaction

Tags

NGSS.HS-PS1-6

If a system at equilibrium has Kc = 1.5 × 10⁻⁵, what does this suggest about the reaction?

• It favors the formation of products

• It favors the formation of reactants

• The forward reaction is very fast

• The reaction has stopped

How does decreasing the volume affect the following equilibrium? N₂(g) + 3H₂(g) ⇌ 2NH₃(g)

• The equilibrium shifts to the left

• The equilibrium shifts to the right

• No effect on equilibrium

• The reaction rate decreases

Tags

NGSS.HS-PS1-5

A reaction has a large Kc value (Kc = 5000). What can be concluded?

• The reaction strongly favors products

• The reaction strongly favors reactants

• The reaction is slow

Predict what will happen if the temperature is increased in the exothermic reaction: 2SO₂(g) + O₂(g) ⇌ 2SO₃(g) + heat.

• The equilibrium shifts to the right

• The equilibrium shifts to the left

• No effect on equilibrium

• The rate of reaction decreases

Tags

NGSS.HS-PS1-5

A reaction initially has Q > K. What will happen?

• A. The reaction will shift left to form more reactants

• B. The reaction will shift right to form more products

• C. No shift occurs

• D. The temperature will change

Which of the following changes will increase the solubility of CaF₂(s) ⇌ Ca²⁺(aq) + 2F⁻(aq)?

• A. Adding more Ca²⁺ ions

• B. Removing some CaF₂(s)

• C. Adding a strong acid

• D. Decreasing the pressure

Tags

NGSS.HS-PS1-5

Why does adding a catalyst not affect equilibrium position?

• It only affects the activation energy

• It shifts equilibrium to the right

• It increases K

• It changes reactant concentration

Which method can be used to increase the yield of NH₃ in the Haber process?

• Increasing temperature

• Decreasing pressure

• Using a catalyst

• Removing NH₃ as it forms

Tags

NGSS.HS-PS1-6