Fort Chem On-line Quiz - Equilibrium

1 At equilibrium, what is equal?

2 In which case does the reaction go farthest to completion?

3

Under which of the following conditions does the equilibrium constant change for the reaction

H2(g) + I2(g) <===> 2 HI(g)

4

What is the expression for the following reaction?

2 NO2(g) <===> 2 NO(g) + O2(g)


5

What is the equilibrium expression for the following reaction?

Ca3(PO4)2(s) <===> 3 Ca^2+(aq) + 2 PO4^3(aq)


6

For the reaction below, what is the equilibrium expression?

2 H2(g) + 2 FeO(s) <===> 2 Fe(s) + 2 H2O(g)


7

2 NOBr(g) <===> 2 NO(g) + 1/2 Br2(g) Kc = 0.44

at a particular temperature, what is the Kc for the following reaction?

NOBr(g) <===> NO(g) + 1/2 Br2(g)

8

A gaseous mixture at 300 ° C is at equilibrium. It contains 8.7 mol HCl, 0.21 mol H2 and 0.43 mol Cl2 in a 1.00 L flask. Calculate Kc for the reaction

2 HCl(g) <===> H2(g) + Cl2(g)

9

A mixture of 5.00 x10^-3 moles of H2 and 2.00 x10^-3 moles of I2 is placed in a 5.00 L container of 448° C and allowed to reach equilibrium. Analysis of the equilibrium mixture shows that 1.86 x10^-3 moles of HI have been formed. Calculate Kc at 448° C for the reaction

H2(g) + I2(g) <===> 2 HI(g)

10

A mixture of 2.0 moles of N2 and 2.0 moles of O2 is placed in a 1-L container at 448° C and allowed to reach equilibrium according to the following reaction.

N2(g) + O2(g) <===> 2 NO(g) Kc = 100

The equilibrium constant is 100. Calculate the concentrations if all species present at equilibrium.

11 In which of the following reactions does a decrease in the volume of the container increase the concentration of the products? Assume constant temperature.


12

The reaction

A <==> B

is performed at two temperatures and the equilibrium constant determined. At temperature T1, the K = 800. At T2 the K = 20. Which statement is true?


13

A flask contains the following system at equilibrium

PbCl2(s) <==> Pb^2+(aq) + 2 Cl^-(aq)

If solid NaCl is added to the system, what change (if any) will be observed?


14

A flask contains the following system at equilibrium

Mg(OH)2(s) <==> Mg^2+(aq) + 2 OH^-(aq)

Which of the following reagents could be added to increase the solubility of Mg(OH)2?

15

Calcium carbonate decomposes when heated according to the following reaction

CaCO3(s) <==> CaO(s) + CO2(g)

The mass of the CaCO3 could be increase by

16 Which of the following statements concerning equilibrium is true?


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