Chemistry

Raymond Chang 10th edition

Chapter 4

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Question 11

When calcium carbonate is placed in water, which of the following best describes what is present in the mixture?

1 2 3 4 5

0% 0% 0%0%0%

A) calcium carbonate molecules only

B) calcium ions and carbonate ions only

C) mostly calcium ions and carbonate ions and little undissociated calcium carbonate

D) a few calcium ions and carbonate ions and a lot of undissociated calcium carbonate

E) hydrated calcium and carbonate ions only

Question 14

The equation Fe3+(aq) + 3OH-(aq) → Fe(OH)3

represents

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0% 0% 0%0%0%

A) a balanced molecular equation.

B) a balanced ionic equation.

C) a balanced net ionic equation.

D) a dissociation reaction.

E) an example of a redox reaction.

Question 16

Which of the following species should be considered a weak Bronsted acid?

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0% 0% 0%0%0%

A) HI

B) OH-

C) HNO3

D) HClO4

E) None of the above

Question 18

In which of the following species is the oxidation number of manganese highest?

1 2 3 4 5

6%

38%

6%

38%

13%

A) MnO2

B) Mn2(SO4)3

C) K2MnO4

D) KMnO4

E) MnO3

Question 19

Which of the following equations does not represent a redox reaction?

1 2 3 4 5

19%

31%

25%

6%

19%

A) Cu + 2AgNO3 → 2Ag + Cu(NO3)2

B) 2CrO42- + 2H+ → Cr2O7

2- + H2O

C) 2SO2 + O2 → 2SO3

D) 2H2 + O2 → 2H2O

E) All are redox

Question 20

A sample of oxalic acid (a diprotic acid of the formula H2C2O4) is dissolved in enough water to make 1.00 L

of solution. A 100.0 mL sample of this solution is titrated with a solution of sodium hydroxide of concentration 0.750 M and requires 20.0 mL of sodium hydroxide to reach the end point. Calculate the mass of the original oxalic acid sample.

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13%

19%

6%

25%

38%

A) 6.75 g

B) 0.675 g

C) 1.35 g

D) 13.5 g

E) None of the above

23.48mL of a NaOH solution are needed to neutralize 0.5468g of KHP (MW 204.2 g/mol). What is the concentration of the base solution?

1 2 3 4

88%

0%6%6%

1. 0.1141M

2. 0.002678M

3. 1.14M

4. Can’t tell

Answer Key – Chapter 4

1. D2. D3. B4. A5. A 6. C7. D8. D9. B 10. B

11. D12. A13. C14. C15. A 16. B17. E18. D19. B 20. A