General Chemistry Presession Quiz

If you have difficulties with this test, it might mean that there is a lot of work ahead of you! You are expected to already know something about Chemical Measurement, Atoms, Molecules, Chemical Reactions, Stoichiometry. It is critical that you brush up on these subjects on your own.
Need a Periodic Table?

Question 1

A bathroom-type scale is calibrated in hundredths of a kilogramfrom 1 to 200 kg. How many significant figures should be used to express the mass of anyone using the scale whose mass is between 11 and 99 kg?

5
4
3
2
1

Question 2

The Hope diamond weighs 44.0 carats. Determine the volume occupied by the diamond, given that its density is 3.5 g cm-3 at 20oC, and that 1 carat = 0.200 g.

2.5 cm3
0.40 cm3
0.06 cm3
63 cm3
150 cm3

Question 3

The recommended daily allowance (RDA) of calcium is 1.0 g. Calcium carbonate contains 40.0% calcium by mass. How many grams of calcium carbonate are needed to provide the RDA of calcium?

0.25 g
0.40 g
1.0 g
2.5 g
4.0 g

Question 4

An Aluminum(III) ion (Al3+) has: ?

13 protons and 13 electrons
27 protons and 24 electrons
16 protons and 13 electrons
13 protons and 10 electrons
10 protons and 13 electrons

Question 5

How many electrons are in one mole of Cl- ions?

6.02 x 1023
12.0 x 1023
1.02 x 1024
1.08 x 1025
9.63 x 1024

Question 6

Atoms of the same element with different mass numbers are called?

nucleons
neutrons
allotropes
isomers
isotopes

Question 7

Which is the correct formula for lead(IV) carbonate?

Pb2(CO3)
Pb(CO3)2
Pb(CO3)4
Pb4(CO3)
Pb4(CO2)

Question 8

Consider the following equation:

V2O5(s)   +   5 Ca(l)  → 2 V(l)   +   5 CaO(s)

When 10 moles of V2O5 are mixed with 10 moles of Ca, which is the limiting reactant according to the above equation?

V2O5
Ca
V
CaO
none of the above

Question 9

Consider the following reaction:

Cr2O3(s)   +   2 Al(s)  →  Al2O3 (s)   +   2 Cr(s)

If 17.39 g of Cr were produced, what was the % yield of Cr if 44.2 g of Cr2O3(s) had been reacted with 35.0 g Al?

7%
23%
46%
58%
75%

Question 10

Consider the following UNBALANCED combustion reaction of a fatty acid (C18H34O2(l)):

C18H34O2(l)   +   O2(g)  →   CO2(g)   +   H2O(g)

for every two moles of the fatty acid burned how many moles of CO2 (g) are produced?

17
18
34
36
51

Question 11

In accordance with the solubility rules, which of the following is true when solutions of CuSO4(aq) and BaCl2(aq) are mixed?

CuCl2 will precipitate, and Ba2+ and SO42- are spectator ions.
CuSO4 will precipitate, and Ba2+ and Cl- are spectator ions.
BaSO4 will precipitate, and Cu2+ and Cl- are spectator ions.
BaCl2 will precipitate, and Cu2+ and SO42- are spectator ions.
No precipitate will form.

Question 12

Which of the following is the correct net ionic equation for the reaction that occurs when solutions of Pb(NO3)2 and NH4Cl are mixed?

Pb(NO3)2(aq)  +   2 NH4Cl(aq) →    NH4NO3(aq)   +   PbCl2(s)
Pb2+(aq)  +   2 Cl-(aq) →   PbCl2(s)
Pb2+(aq)  +  2 NO3-(aq)  +  2 NH4+(aq) +  2 Cl-(aq) →  2 NH4+(aq)  +  2 NO3-(aq)  +  PbCl2(s)
2 NO3-(aq) +  2 NH4+(aq) →   2 NH4NO3(aq)
none of the above.

Question 13

What are the oxidation numbers for each of the elements, K, Ta and F respectively, in K2TaF7?

2+, 1+, 7-
2+, 5+, 1-
2+, 5+, 7-
1+, 5+, 1-
1+, 5+, 7-

Question 14

What is the molarity of an aqueous solution of hydrochloric acid given that it is 36% by weight HCl and the density of the solution is 1.2 g mL-1 ?

10 M
12 M
37 M
44.4 M
none of the above

Question 15

Consider the following UNBALANCED redox equation:

HI(aq)   +   HNO3(aq)  →   I2(s)    +  NO(aq)

When this equation is BALANCED, for an acidic solution, the coefficient in front of HI is?

1
2
4
6
none of the above

Question 16

Consider the following UNBALANCED redox equation:

Bi(OH)3(aq)   +   SnO22- (aq) →    Bi(s)   +  SnO32-(aq)

When this equation is BALANCED, for a basic solution, the coefficient in front of H2O is?

2
3
6
8
9

Question 17

Which of the following is an acid-base neutralization reaction?

2 Al(s)  +  3 H2SO4(aq) →  Al2(SO4)3(aq)   +  3 H2(g)
SO2(g)  +   H2O(l) →  H2SO3(g)
LiOH(aq)  +  HNO3(aq) →  LiNO3(aq)   +  H2O(l)
2 KBr(aq)  +  Cl2(g) →  2 KCl(aq)   +  Br2(l)
CaBr2(aq) +   H2SO4(aq) →  CaSO4(s)   +  2 HBr(g)

Question 18

Which of the following is a precipitation reaction?

2 H2(g)  +   O2(l) →  2 H2O(l)
CaBr2(aq) +   H2SO4(aq) →  CaSO4(s)   +  2 HBr(g)
2 KNO3(s) →  2 KNO2(s)   +  O2(g)
2 KBr(aq)  +  Cl2(g) →  2 KCl(aq)   +  Br2(l)
2 Al(s)  +  3 H2SO4(aq) →  Al2(SO4)3(aq)   +  3 H2(g)

Question 19

An unknown organic compound X gave the following Elemental Analysis data: C = 66.6%, H = 11.3%. What is the empirical formula of X?

C3H8
C3H6O
C4H10
C4H8O
C4H8

Question 20

2.00 g of an unknown organic compound, X, gave 5.59 g of carbon dioxide and 1.31 g of water in a combustion analysis. The empirical formula of X is?

C2H6
C3H3O
C3H8
C6H7O
C3H6

© R. Spinney and V. Mozol 2003 -2005
My thanks to Dr. V. Mozol for her help in generating these quizzes.
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