Equilibrium Constant Kc High School Chemistry

Nitrogen and oxygen do not react appreciably at room temperature, as illustrated by our atmosphere. But at high temperatures, the reaction below can proceed to a measurable extent.

N₂(g) + O₂(g) ⇌ 2NO(g)

At 3000 K, the reaction above has K_c = 0.0153. If 0.3000 mol of pure NO is injected into an evacuated 2.000 L container and heated to 3000 K, what will be the equilibrium concentration of NO?

• 0.0096 mol dm^-3

• 0.0706 mol dm^-3

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-7

At a particular temperature, K_c = 2.0 x 10¯⁶ for the reaction:

2CO₂(g) ⇌ 2CO(g) + O₂(g)

If 2.0 mol CO₂ is initially placed into a 5.0 L vessel, calculate x?

• x = 4.3 x 10¯³ M

• x = 4.3 x 10^-2 M

Tags

NGSS.HS-PS1-5

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-PS1-6

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... SO₂ + O₂ <−>  SO₃ If the equilibrium shifts to the right, the concentration of O₂ will ___________.

• increase

• decrease

• remain the same

• double

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6

Nitrogen and oxygen do not react appreciably at room temperature, as illustrated by our atmosphere. But at high temperatures, the reaction below can proceed to a measurable extent.

N₂(g) + O₂(g) ⇌ 2NO(g)

At 3000 K, the reaction above has K_c = 0.0153. If 0.3000 mol of pure NO is injected into an evacuated 2.000 L container and heated to 3000 K, what will be the equilibrium concentration of NO?

• 0.0096 mol dm^-3

• 0.0706 mol dm^-3

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-7

Nitrogen and oxygen do not react appreciably at room temperature, as illustrated by our atmosphere. But at high temperatures, the reaction below can proceed to a measurable extent.

N₂(g) + O₂(g) ⇌ 2NO(g)

At 3000 K, the reaction above has K_c = 0.0153. If 0.3000 mol of pure NO is injected into an evacuated 2.000 L container and heated to 3000 K, what will be the equilibrium concentration of NO?

• 0.0096 mol dm^-3

• 0.0706 mol dm^-3

Tags

NGSS.HS-PS1-7

At a particular temperature, K_c = 2.0 x 10¯⁶ for the reaction:

2CO₂(g) ⇌ 2CO(g) + O₂(g)

If 2.0 mol CO₂ is initially placed into a 5.0 L vessel, calculate x?

• x = 4.3 x 10¯³ M

• x = 4.3 x 10^-2 M

Tags

NGSS.HS-PS1-7

What is the equilibrium expression for:
Fe₃O₄(s) + 4H₂(g) <=> 3Fe(s) + 4H₂O(g)
K_c =

• [Fe]³ [H₂O]⁴  / [Fe₃O₄] [H₂]⁴
• [Fe₃O₄] [H₂]⁴ /  [Fe]³ [H₂O]⁴
• [H₂O]⁴ / [H₂]⁴
• [Fe] [H₂O] / [Fe₃O₄] [H₂]

Tags

NGSS.HS-PS1-7

If the equilibrium constant is much greater than one (K >> 1) then

• Equilibrium is not established.
• Equilibrium lies to the right (products are favored)
• Equilibrium lies to the left (reactants are favored)
• Neither products or reactants are favored.