Chemical Equilibrium and Reaction Rates

Which of the following does not decrease the rate of reaction?

• Decrease concentration

• Decrease temperature

• Add a catalyst

• Add an inhibitor

Tags

NGSS.HS-PS1-5

What will happen if heat is added to an exothermic reaction?

• Reaction will shift towards reactants

• Reaction will shift toward products

• No shift will occur

• Increase the rate of reaction in both directions

Which of the following is NOT true about chemical equilibrium?

• Amount of reactants equals the amount of products

• Rate of the forward reaction equals the rate of the reverse reaction

• Concentration of reactants and products in constant

• It is dynamic and continuously reacting

Tags

NGSS.HS-PS1-6

Which of the following will cause a shift in equilibrium?

• Adding a catalyst

• Adding a pure solid

• Adding a pure liquid

• Adding a gas

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

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

Tags

NGSS.HS-PS1-5

2SO₂(g)+O₂(g)⇌2SO₃(g)

Increasing the pressure

• shift equilibrium right

• shift equilibrium left

• slow rate of reaction

• have no change

Which of the following are included in equilibrium expressions? Select all that apply.

• Solids

• Liquids

• Gases

• Aqueous

N₂O₄(g) ↔ 2 NO₂(g)
What is the concentration equilibrium constant expression?

• K_c = [NO₂]²/[N₂O₄]
• K_c = [N₂O₄]/[NO₂]²
• K_c = [N₂O₄]²/[NO₂]
• K_c = [NO₂]/[N₂O₄]²

Tags

NGSS.HS-PS1-6

What is the equilibrium-constant expression for 
CO₂(g) + H₂(g) ↔ CO(g) + H₂O(l)

• K_c= [CO][H₂O] / [CO₂][H₂]  
• K_c= [CO₂][H₂] / [CO]
• K_c= [CO₂][H₂] / [CO][H₂O]
• K_c= [CO] / [CO₂][H₂]  

For the reaction...
N_{2 (g)} +  3 H_2 (g) <−> 2 NH_{3 (g)}

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

• N₂
• H₂
• N₂ and H₂
• NH₃