Chemistry Raymond Chang 10 th edition Chapter 4 Copyright © The McGraw-Hill Companies, Inc....
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Transcript of Chemistry Raymond Chang 10 th edition Chapter 4 Copyright © The McGraw-Hill Companies, Inc....
Chemistry
Raymond Chang 10th edition
Chapter 4
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
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
1 2 3 4 5
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?
1 2 3 4 5
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.
1 2 3 4 5
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