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A2 multiple choice test on equilibrium

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MrsSeymour
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A2 Equilibrium

Question 1 of 5

1

What is the correct definition of dynamic equilibrium?

Select one of the following:

  • The forward reaction and backward reaction proceed at the same rate. The concentration of the reactants and products are the same.

  • The forward reaction and backward reaction proceed at the same rate. The concentration of the reactants and products remains constant.

  • The forward reaction and backward reaction proceed at an increased rate. The concentration of the reactants and products remains constant.

Explanation

Question 2 of 5

1

If the equilibrium expression is [A][B]2 / [C][D]3 (the number 2 and 3 are powers)... what would the equation be?

Select one of the following:

  • A + 2B < > C + 3D

  • A + 2B < > 3C + D

  • 2A + B < > 3C + D

Explanation

Question 3 of 5

1

If the powers on the top row of an expression are 2 and 2 and on the bottom row are 1 and 3, what would the unit for Kc be?

Select one of the following:

  • moldm-3

  • mol-1dm3

  • No unit

Explanation

Question 4 of 5

1

What is Kc?

Select one of the following:

  • Rate constant

  • Equilibrium constant

  • Reversible reaction constant

Explanation

Question 5 of 5

1

A 2.50 mol sample of NOCl was heated in a sealed container and equilibrium was established at a given temperature. The equilibrium mixture formed contained 0.80 mol of
NO. What is the amount, in moles, of Cl2 and of NOCl in this equilibrium mixture? The equation is; 2NOCl(g) 2NO(g) + Cl2 (g)

Select one of the following:

  • Cl2 = 0.4 moles
    NOCl = 1.7 moles

  • Cl2 = 0.8 moles
    NOCl = 1.7 moles

  • Cl2 = 0.4 moles
    NOCl = 0.9 moles

Explanation

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