GENERAL CHEMISTRY I
CHEM 1311.001
EXAM 1
Friday February 12, 1999

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1. What term means "a tested explanation of natural phenomena"?
a) hypothesisb) experimentc) theory
d) lawe) observation
2. What term means "use of the senses or extensions thereof, to acquire information about natural phenomena"?
a) hypothesisb) experimentc) theory
d) lawe) observation
3. What term means "a concise statement or mathematical equation about natural phenomena"?
a) hypothesisb) experimentc) theory
d) lawe) observation
4. What term means "a tentative explanation of natural phenomena"?
a) hypothesisb) experimentc) theory
d) lawe) observation
5. What term means "an observation of natural phenomena, carried out in a controlled manner so that the results can be duplicated and rational conclusions can be obtained"?
a) hypothesisb) experimentc) theory
d) lawe) observation
6. A law usually

a) applies to a broad variety of cases

b) applies to just a few limited cases

7. What name is usually given to the organized sequence of steps one follows to acquire information about natural phenomena?
a) trial and errorb) organized inquiry
c) the scientific methodd) directed observation
e) inductive reasoning
8. A carpenter reports the length of a wooden plank to be 38.0 inches. How many significant figures are there in the number 38.0 as used in this context?
a) 1b) 2c) 3
d) infinitee) indeterminate
9. There are 12 inches in a foot. How many significant figures are there in the number 12 as used in this context?
a) 0b) 1c) 2
d) infinitee) indeterminate
10. A small piece of metal was weighed and found to have a mass of 0.0015 g. How many significant figures are there in the number 0.0015 as used in this context?
a) 2b) 3c) 4d) 5
e) indeterminate
11. A chemist reports that the volume of a water sample is 107.2 mL. How many significant figures are there in the number 107.2 as used in this context?
a) 3b) 4c) 5
d) infinitee) indeterminate
12. A chemist measures out a 100.00 g sample of a compound for use in an experiment. How many significant figures are there in the number 100.00 as used in this context?
a) 1b) 3c) 5
d) infinitee) indeterminate
13. It is reported that a certain city street is 5000 feet long. How many significant figures are there in the number 5000 as used in this context?
a) 1b) 4c) 5
d) infinitee) indeterminate
14. There are 60 seconds in a minute. How many significant figures are there in the number 60 as used in this context?
a) 1b) 2c) 60
d) infinitee) indeterminate
15. Any number which is known to be exact will have

a) some definite number of significant figures

b) an infinite number of significant figures

c) an indeterminate number of significant figures

16. Exact numbers arise when

a) we measure things, like length of volume

b) we count things that only come in whole numbers, like people

c) when we define things, like 3 feet in a yard

d) both a and b

e) both b and c

17. According to significant figure rules, how many uncertain digits are allowed to be carried in a number that expresses the results of a measurement?
a) noneb) onec) an infinite number
d) There are no uncertain digits in a measured number, because measurements are exact

18. According to significant figure rules, what is the proper way to express the area of a rectangle that has a length of 10.00 cm and a width of 5.07 cm? Recall that area is calculated by multiplying length by width.
a) 5 x 101 cm2b) 51 cm2c) 50.7 cm2
d) 50.70 cm2e) 50.700 cm2
19. According to significant figure rules, what is the proper way to report the density of a metal that has a mass of 21.275 g and a volume of 2.8 mL? Recall that density is calculated by dividing mass by volume.
a) 8 g / cm3b) 7.6 g / cm3
c) 7.60 g / cm3d) 7.598 g / cm3
e) 7.5982 g / cm3
20. According to significant figure rules, what is the proper way to express the combined length of two pieces of string, one having of length of 5.070 m and the other having a length of 15.2 m? Note that the combined length is calculated by adding the two lengths.
a) 2 x 101 cmb) 20 cmc) 20.3 cm
d) 20.27 cme) 20.270 cm
21. According to significant figure rules, what is the proper way to express the mass of water in a beaker if the empty beaker has a mass of 84.2117 g and the mass of the beaker with the water is 105.22 g? Note that the mass of water is calculated by subtracting the mass of the empty beaker from the mass of the beaker with the water.
a) 21 gb) 21.0 gc) 21.01 g
d) 21.008 ge) 21.0083 g
22. A kind of matter that can be classified as a mixture can __________ be classified as a substance.
a) alwaysb) sometimesc) never
23. A substance

a) can never be a compound

b) may or may not be a compound

c) is always a compound

24. What is the chemical formula of magnesium bromide?
a) MgBrb) Mg2Brc) MgBr2
d) Mg2Br3e) Mg3Br2
25. What is the chemical formula of potassium iodide?
a) KIb) K2Ic) KI2
d) K2I3e) K3I2
26. What is the chemical formula of aluminum oxide?
a) AlOb) Al2Oc) AlO2
d) Al2O3e) Al3O2
27. What is the chemical formula of magnesium chloride?
a) MgClb) Mg2Clc) MgCl2
d) Mg2Cl3e) Mg3Cl2
28. What is the chemical formula of calcium nitride?
a) CaNb) Ca2Nc) CaN2
d) Ca2N3e) Ca3N2
29. What is the chemical formula of potassium sulfide?
a) KSb) K2Sc) KS2
d) K2S3e) K3S2
30. What is the chemical formula of ammonium chloride?
a) NH4Clb) (NH4)2Clc) NH4Cl2
d) (NH4)2Cl3e) (NH4)3Cl2
31. What is the chemical formula of sodium sulfate?
a) NaSO4b) Na2SO4c) Na(SO4)2
d) Na2(SO4)3e) Na3(SO4)2
32. What is the chemical formula of calcium nitrate?
a) CaNO3b) Ca2NO3c) Ca(NO3)2
d) Ca2(NO3)3e) Ca3(NO3)2
33. What is the chemical formula of calcium carbonate?
a) CaCO3b) Ca2CO3c) Ca(CO3)2
d) Ca2(CO3)3e) Ca3(CO3)2
34. What is the chemical formula of aluminum phosphate?
a) AlPO4b) Al2PO4c) Al(PO4)2
d) Al2(PO4)3e) Al3(PO4)2
35. What is the chemical formula of lead(IV) oxide? Recall that the Roman number indicates the charge of the metal ion. The charge of the non-metal ion you should know from the periodic table.
a) PbOb) Pb2Oc) PbO2
d) Pb4Oe) PbO4
36. What is the chemical formula of lead (II) oxide? Recall that the Roman number indicates the charge of the metal ion. The charge of the non-metal ion you should know from the periodic table.
a) PbOb) Pb2Oc) PbO2
d) Pb4Oe) PbO4
37. Copper forms two ions: Cu+ and Cu2+. With this in mind, which of the following is a correct chemical name for CuO?
a) copper oxideb) copper(I) oxide
c) cuprous oxided) cupric oxide
e) both b and d
38. Chromium forms two ions: Cr2+ and Cr3+. With this in mind, which of the following is a correct chemical name for Cr2O3?
a) chromium oxideb) chromium(III) oxide
c) chromous oxided) chromic oxide
e) both b and d
39. What is the chemical name of HNO3? Hint: consider the name of the corresponding polyatomic anion. There is a relationship between the name of the anion and the name of the acid.
a) hyponitrous acidb) nitrous acidc) nitric acid
d) pernitrous acide) hydronitric acid
40. What is the chemical name of H2S? Hint: this is a binary acid. Consider the H2S to be dissolved in water.
a) hyposulfurous acidb) sulfurous acidc) sulfuric acid
d) persulfurous acide) hydrosulfuric acid

ANSWERS:

1 c      2 e      3 d      4 a      5 b     

6 a      7 c      8 c      9 d      10 a     

11 b      12 c      13 e      14 d      15 b     

16 e      17 b      18 c      19 b      20 c     

21 c      22 c      23 b      24 c      25 a     

26 d      27 c      28 e      29 b      30 a     

31 b      32 c      33 a      34 a      35 c     

36 a      37 d      38 e      39 c      40 e     

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