CHEM 1301
Fall 2004
TEST 3 VERSION 1
1.
Consider the reaction between aluminum sulfate and barium chloride shown. Which of the statements is FALSE?
Al2(SO4)3 + 3 BaCl2 → 3 BaSO4 + 2 AlCl3
(A)
(B)
(C)
(D)
(E)
this is a metathesis reaction
aluminum chloride is a product of the reaction
6 "molecules" of barium chloride will make 6 "molecules" of barium sulfate
there will be 3/2 times as many aluminum chloride molecules made as there are molecules of barium chloride used.
the fact that the number of each type of atom on each side is equal is related to the Law of Conservation of Mass.
2.
When the following equation is balanced using the smallest possible whole numbers, what is the coefficient of O2(g)?
C5H10O2(l) + O2(g) → H2O(g) + CO2(g)
(A)
1
3.
After the following equation is balanced with the smallest possible whole numbers, what is the sum of the coefficients?
NO2(g) + H2(g) → NH3(g) + H2O
(A)
4
4.
What is the molar mass of magnesium nitrate?
(A)
(D)
38.3 g/mol
86.3 g/mol
(B)
(B)
6
10
(C)
7
(D)
(C)
15
(D)
(B)
(E)
43 g/mol
148.3 g/mol
1
13
17
(E)
15
(E)
20
(C)
74 g/mol
5.
How many moles of water contain 2.22 x 1024 molecules of water?
(A)
(D)
3.69 moles
36.9 moles
6.
How many moles of NH3 are needed to react completely with 30.0 mol of F2?
2 NH3 + 5 F2
→ N2F4
+
6 HF
(A)
2 mol
7.
Which of the following has the largest mass of oxygen?
(A)
(C)
(E)
6.02 x 1023 molecules of O2
0.500 mol of O2
Both (B) and (C) are the largest mass
8.
Calculate the mass in grams of 1.505 x 1023 molecules of CH4.
(A)
4g
9.
How many fluorine atoms are present in 19.75 g of the Freon C2HBrClF3?
(A)
1.81 x 1023
10.
Germanium (IV) chloride reacts with sulfur trioxide to produce Germanium (IV) sulfate (which has the formula, Ge(SO4)2) and
S2O5Cl2. How many moles of sulfur trioxide are needed to react with 2 moles of Germanium (IV) chloride?
(A)
2 mol
(B)
(E)
(B)
(B)
(B)
(B)
12 mol
16 g
6.02 x 1023
3 mol
0.272 moles
1.34 x 1048 moles
(C)
5 mol
(B)
(D)
(C)
(C)
(C)
(C)
2.72 moles
(D)
30 mol
(E)
75 mol
16.0 g of O2
all have the same mass
40 g
6.69 x 1021
6 mol
2
(D)
64 g
(E)
2.4 x 1024 g
(D)
6.03 x 1022
(E)
2.23 x 1023
(D)
12 mol
(E)
24 mol
11.
6.02 x 1021 molecules of an unknown substance X has a mass of 2.00 grams. What is the molar mass of X in g/mole?
(A)
0.02 g/mol
12.
Barium hydroxide (used in corrosion inhibitors and lubricants) reacts with chloric acid (HClO3) to form barium chlorate [Ba(ClO3)2]
and water. What mass of water is formed when 138 g of barium hydroxide reacts with chloric acid?
(A)
32.5 g
13.
Lead(II) sulfide (PbS) was once used in glazing earthenware. It will also react with hydrogen peroxide (H2O2) to form lead(II) sulfate
and water. How many grams of hydrogen peroxide are needed to react completely with 265 g of lead(II) sulfide?
(A)
151 g
14.
Which of the following is NOT an example of a solution?
(A)
(B)
(C)
(D)
(E)
well-stirred cup of coffee
the atmosphere
sterling silver
Gatorade
all of these are examples of solutions
15.
Hydrochloric acid is widely used as a laboratory reagent, in refining ore for the production of tin and tantalum, and as a catalyst in
organic reactions. Calculate the number of moles of HCl in 62.50 mL of 0.500 M hydrochloric acid.
(A)
0.03125 mol
16.
A 0.30 M solution of sulfuric acid is to be reacted with a solution of sodium hydroxide to make sodium sulfate and water. 33.3 mL of
the H2SO4 solution reacts with 25.0 mL of the NaOH solution. What is the molarity of the NaOH solution?
(A)
0.2 M
(B)
(B)
(B)
(B)
(B)
0.2 g/mol
29.0 g
123 g
0.125 mol
0.3 M
(C)
(C)
(C)
(C)
(C)
20 g/mol
16.2 g
37.7 g
8 mol
0.4 M
3
(D)
(D)
(D)
(D)
(D)
200 g/mol
7.31 g
9.41 g
31.25 mol
0.6 M
(E)
(E)
(E)
(E)
(E)
2000 g/mol
138 g
265 g
125 mol
0.8 M
17.
What is the molarity of formaldehyde in a solution containing 0.30 g of formaldehyde (CH2O) per mL?
(A)
(B)
(C)
(D)
(E)
0.3 M
1M
3M
10 M
30 M
18.
How many milliliters of 2.50 M HCl are needed to react completely with 42 g NaHCO3 to make sodium chloride, water and carbon
dioxide?
(A)
(B)
(C)
(D)
(E)
0.2 mL
16.8 mL
105 mL
200 mL
2,500 mL
19.
Which of the following reactions is incorrectly described?
(A)
(B)
(C)
(D)
(E)
Hydrogen gas (H2) plus chlorine gas (Cl2) react to produce HCl in a combination reaction.
Hydrogen peroxide produces water and oxygen gas (O2) in a combustion reaction.
Sodium reacts with water to produce NaOH and H2 in a single displacement reaction.
When heated, calcium carbonate produces calcium oxide and carbon dioxide in a decomposition reaction
The reaction between potassium carbonate and aluminum nitrate to give potassium nitrate and aluminum carbonate is a metathesis or
double displacement reaction.
20.
You know five categories of reactions. Which of the following could be described by more than one of these categories?
(A)
(D)
H2 + Cl2 → 2 HCl
2 Na + 2 H2O → H2 + 2 NaOH
(B)
(E)
CaCO3 → CaO + CO2
(C)
NaCl + AgNO3 → AgCl + NaNO3
4
2 H2 + O2 → 2 H2O