CHEM 1311.001 EXAM 2 Fri. Oct. 16, 1998

GENERAL CHEMISTRY I CHEM 1311.001 EXAM 2 Friday October 16, 1998

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Note: The first four problems on this test deal with the definitions compound, element, mixture, and substance. Each definition is cited once -- and only once -- in the first four problems.

1. A kind of matter that can not be separated into simpler kinds of matter by chemical processes is called a(n)

      a) compound       b) element       c) mixture       d) substance

2. A kind of matter that can not be separated into simpler kinds of matter by physical processes is called a(n)

      a) compound       b) element       c) mixture       d) substance

3. A kind of matter that CAN be separated into simpler kinds of matter by physical processes is called a(n)

      a) compound       b) element       c) mixture       d) substance

4. A kind of matter that consists of a chemical combination of two elements is called a(n)

      a) compound       b) element       c) mixture       d) substance

Questions 5 - 10 test your understanding of the terms referenced in the above four problems by applying them to practical situations, rather than just asking about the definitions.

5. The kind of matter you would have if someone dumped sand in your half filled sugar bowl, then covered the bowl and shook it, would be a(n)

      a) compound       b) element       c) mixture       d) substance

6. The properties of the starting materials are retained (do not change) when

      a) a compound is formed       b) a mixture is formed

7. A chemist can personally control the relative amounts of each starting material when forming

      a) a compound       b) a mixutre       c) both       d) neither

8. Any kind of matter that can be classified as a compound can also be classified as a(n)

      a) element       b) mixture       c) substance       d) none of these

9. Any kind of matter that can be classified as an element can also be classified as a(n)

      a) compound       b) mixture       c) substance       d) none of these

10. Any kind of matter that can be classified as a mixture can also be classified as a(n)

      a) compound       b) element       c) substance       d) none of these

Questions 11 - 20 pertain to ionic compounds containing only monatomic ions

11. What is the formula of aluminum sulfide?

      a) AlS       b) Al₂S       c) AlS₂       d) Al₂S₃       e) Al₃S₂

12. What is the formula of barium oxide?

      a) BaO       b) Ba₂O       c) BaO₂       d) Ba₂O₃       e) Ba₃O₃

13. What is the formula of magnesium bromide?

      a) MgBr       b) Mg₂Br       c) MgBr₂       d) Mg₂Br₃       e) Mg₃Br₂

14. What is the formula of aluminum phosphide?

      a) AlP       b) Al₂P       c) AlP₂       d) Al₂P₃       e) Al₃P₂

15. What is the formula of calcium nitride?

      a) CaN       b) Ca₂N       c) CaN₂       d) Ca₂N₃       e) Ca₃N₂

16. What is the formula of aluminum fluoride?

      a) AlF       b) AlF₂       c) AlF₃       d) Al₂F       e) Al₃F

17. What is the formula of strontium nitride?

      a) SrN       b) Sr₃N       c) Sr₃N₂       d) Sr₂N₃       e) SrN₃

18. What is the formula of magnesium chloride?

      a) MgCl       b) MgCl₂       c) MgCl₃       d) Mg₂Cl       e) Mg₂Cl₂

19. What is the formula of calcium oxide?

      a) CaO       b) CaO₂       c) CaO₃       d) Ca₂O       e) Ca₂O₂

20. What is the formula of barium iodide?

      a) BaI       b) BaI₂       c) BaI₃       d) Ba₂I       e) Ba₂I₂

Questions 21 - 25 pertain to ionic compounds containing polyatomic ions (although monatomic ions may also be present)

21. What is the formula of sodium nitrite?

      a) Na₃N       b) NaNO₂       c) NaNO₃       d) Na(NO₂)₂       e) Na(NO₃)₂

22. What is the formula of ammonium carbonate?

      a) NH₄CO₃       b) (NH₄)₂CO₃       c) NH₄(CO₃)₂       d) (NH₄)₄(CO₃)₃       e) (NH₄)₃(CO₃)₄

23. What is the formula of calcium permanganate?

      a) CaMnO₄       b) Ca₂MnO₄       c) Ca(MnO₄)₂       d) Ca₄(MnO₄)₂       e) Ca(MnO)₄

24. What is the formula of potassium chromate?

      a) KCrO₄       b) K₂CrO₄       c) K(CrO₄)₂       d) K₂Cr₂O₇       e) K(Cr₂O₇)₂

25. What is the formula of sodium dihydrogen phosphate?

      a) NaH₂PO₄       b) Na₂H₂PO₄       c) Na(H₂PO₄)₂       d) NaHPO₄       e) Na(HPO₄)₂

Questions 26 - 30 pertain to ionic compounds containing cations that can have more than one charge. These compounds may also include polyatomic ions.

26. What is the formula of tin(II) sulfide?

      a) SnS       b) Sn₂S       c) SnS₂       d) SnS₄       e) Sn₂S₄

27. What is the formula of tin(IV) oxide?

      a) SnO       b) Sn₂O       c) SnO₂       d) SnO₄       e) Sn₄O

28. What is the formula of stannous chloride? Hint: You know the two different ion charges of tin, because they have been encountered in problems 26 and 27.

      a) SnCl       b) Sn₂Cl       c) SnCl₂       d) SnCl₄       e) Sn₄Cl

29. What is the formula of iron(II) sulfate?

      a) FeSO₄       b) Fe₂SO₄       c) Fe(SO₄)₂       d) Fe₂(SO₄)₃       e) Fe₃(SO₄)₂

30. What is the formula of iron(III) oxide?

      a) FeO       b) Fe₂O       c) Fe₃O       d) Fe₂O₃       e) Fe₃O₂

Questions 31 - 37 pertain to classification of reactions by type

31. The reaction

      NH₄Cl(s)       ---------->      NH₃(g)       +       HCl(g)

is an example of what kind of reaction?

      a) combination       b) combustion       c) decomposition       d) displacement       e) metathesis

32. The reaction

      2C₂H₂(g)       +       5O₂(g)       ---------->       4CO₂(g)       +       2H₂O(g)

is an example of what kind of reaction?

      a) combination       b) combustion       c) decomposition       d) displacement       e) metathesis

33. The reaction

      2AgNO₃(aq)       +       CaCl₂(aq)       ---------->       2AgCl(s)       +       Ca(NO₃)₂

is an example of what kind of reaction?

      a) combination       b) combustion       c) decomposition       d) displacement       e) metathesis

34. The reaction

      Fe(s)       +       S(s)       ---------->       FeS(s)

is an example of what kind of reaction?

      a) combination       b) combustion       c) decomposition       d) displacement       e) metathesis

35. The reaction

      2Al(s)       +       3NiCl₂(aq)       ---------->       2AlCl₃(aq)       +       3Ni(s)

is an example of what kind of reaction?

      a) combination       b) combustion       c) decomposition       d) displacement       e) metathesis

36. Another name for "single replacement" reaction is __________ reaction.

      a) combination       b) combustion       c) decomposition       d) displacement       e) metathesis

37. Another name for "double replacement" reaction is __________ reaction.

      a) combination       b) combustion       c) decomposition       d) displacement       e) metathesis

Questions 38 - 40 pertain to precipitate formation (or lack thereof)

38. What will happen (if anything) when aqueous solutions of ammonium sulfate and calcium chloride are mixed?

      a) no precipitate will form

      b) a single precipitate of ammonium chloride will form

      c) a single precipitate of calcium sulfate will form

      d) two precipitates -- ammonium chloride and calcium sulfate -- will form

39. What will happen (if anything) when aqueous solutions of sodium nitrate and potassium phosphate are mixed?

      a) no precipitate will form

      b) a single precipitate of sodium phosphate will form

      c) a single precipitate of potassium nitrate will form

      d) two precipitates -- sodium phosphate and potassium nitrate -- will form

40. What will happen (if anything) when aqueous solutions of lead(II) nitrate and potassium carbonate are mixed?

      a) no precipitate will form

      b) a single precipitate of lead(II) carbonate will form

      c) a single precipitate of potassium nitrate will form

      d) two precipitates -- lead(II) carbonate and potassium nitrate -- will form

*** THE END ***

ANSWERS:

1b     2d     3c     4a    5c

6b     7b     8c     9c    10d

11d     12a     13c     14a    15e

16c     17c     18b     19a    20b

21b     22b     23c     24b    25a

26a     27c     28c     29a    30d

31c     32b     33e     34a    35d

36d     37e     38c     39a    40b

Note: The error in the answer to problem 6 has been corrected. The original posting of this test had c as the answer to problem 6. The correct answer is b. In fact, c is not even a choice on problem 6. Users who accessed this test before 4:00 PM CST Tuesday March 2, 1999 need to correct the answer in their records.

This page was last modified Tuesday March 2, 1999