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Equilibrium and Le Chatelier's Principle

Authored by Alyson Colin

Science

9th - 12th Grade

Used 2+ times

Equilibrium and Le Chatelier's Principle
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11 questions

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1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which change would shift the equilibrium toward the products in the reaction CH4 (g) + 2 H2S (g) ↔ CS2 (g) + 4 H2 (g)

Increase concentration of methane (CH4)

Decrease concentration of methane (CH4)

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which change would force the reaction to move in the reverse direction 3H2(g)+N2(g) <---> 2NH3(g) ?

Remove H2

Add Catalyst

Remove NH3

Add H2

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

3H2(g)+N2(g) <----> 2NH3(g) What is the equilibrium constant, Kc, for the reaction? Give your answer to the nearest tenth. [NH3] = 0.41 M; [N2] = 0.042 M; [H2] = 0.104 M

2.81 × 10−4

93.86

3358

0.0107

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Write the Kc equilibrium expression for the equation:

O3 (g) + NO(g) <--> O2(g) + NO2(g)

[O2] * [NO2]

( [O2] * [NO2] ) / ( [O3] * [NO] )

( [O2]^2 * [NO2] ) / ( [O3]^3 * [NO] )

( [O3] * [NO] ) / ( [O2] * [NO2] )

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

According to Le Chatelier's Principle, adding reactants to a chemical reaction at equilibrium will cause the reaction to __________________________________________________ (you need more than one word here – it's a phrase)

Shift toward reactants

Right

Forward

Shift toward products

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

PCl5(g) <-->PCl3(g) + Cl2(g).

What is the equilibrium constant if the equilibrium concentrations are as follows: PCl5 is 0.0096 mol/L, PCl3 is 0.0247 mol/L and Cl2 is 0.0247 mol/L?

(0.0096) / (0.0247)^2 = 15.73

(0.0247)^2 / (0.0096) = 0.0636

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Write the Kc equilibrium expression for the equation: 2H2O(g) → 2H2(g) + O2(g)

[H2] * [O2] / [H2O]

[H2]^2 * [O2] / [H2O]^2

[H2]^2 * [O2]

[H2O]^2 / [H2]^2 * [O2]

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