Download Quiz Choose the correct answer: 1. How many micrometers in 0.5

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Quiz
Choose the correct answer:
1. How many micrometers in 0.5 centimeter?
A. 500 µm
B. 5 x 10-4 µm
C. 5 x 106 µm
D. 5 x 103 µm*
__________________________________________________
2. Express 122F in C.
A. 50.0C *
B. 64.4C
C. 67.8C
D. 162.0C
___________________________________________________
3. What is the number of protons and electrons in Mg2+?
A. 12 protons, 12 electrons
B. 12 protons, 14 electrons
C. 12 protons, 10 electrons *
D. 14 protons, 12 electrons
____________________________________________________
4. What is the formula for copper (II) cyanide?
A. CuCN
B. Cu(CN)2 *
C. Cu2CN
D. CuNCO
________________________________________________
5.
Calculate the number of moles of chloroform (CHCl3) in 198 g of chloroform.
A. 3.82 mol
B.
1.66 mol *
C. 6.1 x 10-12 mol
D.
8.9 x 10-3 mol
______________________________________________________
6. How many molecules are there in 8.0 g of ozone, O3?
A.
3 molecules
B.
3.6  1024 molecules
C.
1.0  1023 molecules *
D.
3.0  1023 molecules
__________________________________________________________
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7. The atomic masses of the two stable isotopes of boron, 510B (19.78 percent) and
11
5 B (80.22 percent), are 10.0129 amu and 11.0093 amu, respectively. Calculate the
average atomic mass of boron.
A. 10.50
B. 21.00
C. 10.81 *
D. 50%
_________________________________________________________
8.
What is the molecular formula of a vitamin C that has a molar mass of 176 g/mol,
and an empirical formula C3H4O3.
A.
C6H8O6 *
B.
C9H18O
C.
C16H28O4
D.
C18H36O2
________________________________________________________
9.
Balance the following equation using the smallest set of whole numbers, then add together
the coefficients. Don't forget to count coefficients of one.
__ SF4 + __ H2O  __ H2SO3 + __ HF
The sum of the coefficients is
A. 6
B. 7
C.
9*
D.
none of these
________________________________________________________________
10. Calculate the mass of FeS formed when 9.42 g of Fe reacts with 8.50 g of S.
Fe(s) + S(s)  FeS(s)
A.
17.9 g
B.
87.9 g
C.
26.0 g
D. 14.8 g *
2
Answer Key:
1. D
2. A
3. C
4. B
5. B
6. C
7. C
8. A
9. C
10. D
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