Module 5 Review HSC CHem

Which is the reactant - and why?

• A, as concentration decreases

• A, as concentration increases

• B, as concentration decreases

• B, as concentration increases

Tags

NGSS.HS-PS1-5

When the system X + 2 Y <=> Z has reached equilibrium, which of the following is TRUE?

• Forward reaction and Backward reaction stop.

• Forward reaction has sped up and backward reaction has slowed down.

• Forward and backward reactions occur at the same rate.

• Forward reaction has slowed down and backward reaction has sped up.

At what time the reaction reached equilibrium?

• t₁

• t₂

• t₃

• t₄

Tags

NGSS.HS-PS1-5

For the reaction...

SO₂ + O₂ <=> SO₃

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

• to the left

• to the right

• to the left and right

• neither left nor right

Tags

NGSS.HS-PS1-5

For the reaction...

SO₂ + O₂ <=> SO₃

If the equilibrium position shifts to the right, the concentration of O₂ will ___________.

• increase

• decrease

• remain the same

• double

Tags

NGSS.HS-PS1-6

For the reaction...

N₂ + O₂ <=> 2NO

If O₂ is removed, the concentration of N₂ will _______.

• increase

• decrease

• remain the same

• double

Tags

NGSS.HS-PS1-5

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 (as 2 mol gas → 4 mol gas)

• H₂ (as 2 mol gas → 4 mol gas)

• N₂ and H₂ (as 2 mol gas → 4 mol gas)

• NH₃ (as 4 mol gas → 2 mol gas)

Tags

NGSS.HS-PS1-7

For the reaction...

N₂ + O₂ <=> 2NO: Δ H = +182 kJ mol^-1.

If the temperature is increased the equilibrium position will shift _______.

• to the left

• to the right

• to the left and right

• neither left nor right

Tags

NGSS.HS-PS1-6

What is the K_c expression for this reaction?

2 NO_(g) + O_2(g) ⇌ 2 NO_2(g)

• K_c = [NO₂]² / [NO]² [O₂]

• K_c = [NO]² [O₂] / [NO₂]²

• K_c = [NO]² [O₂] [NO₂]²

• K_c = [NO₂]² / [NO]² + [O₂]

Consider the following reaction:

2SO_2(g) + O_2(g) <=> 2SO_3(g): ΔΗ = - 197 kJ mol ^-1

Which of the following will NOT shift the equilibrium position to the right?

• Adding more O₂

• Adding a catalyst

• increasing the pressure

• Lowering the temperature

Tags

NGSS.HS-PS1-6