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WorksheetsChemistry I - Quiz II
Total questions: 20
Worksheet time: 27mins
A stainless steel ball bearing has a radius of 6.35 mm and a density of 7.75 g/cm3. What is the mass of this ball? (π=3)
0.128
7.936
0.02
0.992
1.024
When the equation below is balanced, the correct set of stoichiometric coefficients will be________.
? Cu(s) + ? HNO3(aq) → ? Cu(NO3)2(aq) + ? H2O(l) + ? NO(g)
1, 6, 1, 3, 4
1, 3, 8, 2, 4
3, 8, 3, 4, 2
1, 4, 1, 2, 2
2, 6, 2, 3, 2
What is the empirical formula of a compound that contains 85.7% carbon and 14.3% hydrogen by mass?
CH3
C2H3
CH
C3H6
CH2
What is the percent composition by mass of hydrogen in methane (CH4)?
(Atomic weight of C=12, H=1 g/mol)
12.50%
50.00%
20.00%
25.00%
33.33%
How many moles of ammonia (NH3) are produced when 3 moles of nitrogen gas react with 9 moles of hydrogen gas?
3 moles
15 moles
6 moles
9 moles
12 moles
How many moles of carbon dioxide are produced when 5 moles of propane (C3H8) are completely combusted?
5 moles
10 moles
15 moles
20 moles
25 moles
What is the percent composition by mass of nitrogen in ammonium nitrate (NH4NO3)?
(Atomic weight of N=14, H=1, O=16 g/mol)
52.50%
58.33%
42.00%
35.00%
28.00%
Which of the following is the balanced equation for the reaction of aluminum with oxygen to form aluminum oxide?
4 Al + 3 O2 → 2 Al2O3
2 Al + O2 → Al2O3
Al + O2 → AlO2
3 Al + 2 O2 → Al3O4
2 Al + 3 O2 → 2 AlO3
Which of the following is the balanced equation for the reaction of iron with oxygen to form iron(III) oxide?
2 Fe + O2 → Fe2O3
4 Fe + 3 O2 → 2 Fe2O3
Fe + O2 → FeO
2 Fe + 3 O2 → 2 FeO3
3 Fe + 2 O2 → Fe3O4
An aqueous solution that is 5.30% LiBr by mass has a density of 1.040 g/mL. What is the molarity of this solution?
(Atomic weight of Li=7 and Br=80 g/mol)
0.0563 M
12.0 M
0.0635 M
0.563 M
0.635 M
Nitric acid, HNO3, can be manufactured from ammonia, NH3, by using the three reactions shown below. What is the maximum number of moles of HNO3 that can be obtained from 4.00 moles of NH3?
(Assume that the NO produced in step 3 is not recycled back into step 2.)
Step 1: 4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(l)
Step 2: 2NO(g) + O2(g) → 2NO2(g)
Step 3: 3NO2(g) + H2O(l) → 2HNO3(aq) + NO(g)
1.33 mol
2.00 mol
2.67 mol
4.00 mol
6.00 mol
The oxidation state of I in the ion is H4IO6- is
-1
0
+1
+7
+8
Compared with its mass on Earth, the mass of the same object on the moon should be
less
more
the same
nearly the same, but somewhat less
None of them
Vitamin C is essential for the prevention of scurvy. Combustion of a 0.2000 g sample of this carbon–hydrogen–oxygen compound yields 0.2998 g CO2 and 0.0819 g H2O. What is the empirical formula of vitamin C? (Atomic weight of O=16.004, C=12.011 g and H=1.008 g/mol, Avogadro Constant=6.022x1023)
CH2O
C2H5O5
C3H7O2
C2H5O9
C3H4O3
When heated with sulfuric or phosphoric acid, cyclohexanol, C6H11OH, is converted to cyclohexene, C6H10. The balanced chemical equation for the reaction is shown below. If the percent yield is 83%, what mass of cyclohexanol must we use to obtain 25 g of cyclohexene? (Molecular weight of C6H11OH=100.2 and C6H10=82.1 g/mol, Avogadro’s constant = 6.022 x 1023)
C6H11OH(l) → C6H10(l) + H2O(l)
27
37
47
57
67
What is the molarity of a solution prepared by dissolving 5.00 g of NaCl in enough water to make 250 mL of solution? (Atomic weight of Na=23, Cl=35.5 g/mol)
0.684 M
0.513 M
0.256 M
0.171 M
0.342 M
An analytical balance can detect a mass of 0.1 mg. How many ions are present in this minimally detectable quantity of MgCl2? (Avogadro Constant=6.0x1023, MW of MgCl2=95 g/mol)
2 x 1018
3 x 1018
4 x 1018
5 x 1017
6 x 1016
Which of the following is the balanced equation for the reaction of calcium with water to form calcium hydroxide and hydrogen gas?
Ca + 2 H2O → Ca(OH)2 + H2
2 Ca + 2 H2O → 2 Ca(OH)2 + H2
Ca + H2O → CaO + H2
Ca + H2O → Ca(OH)2 + H2
Ca + 2 H2O → CaO + 2 H2
What is the molarity of a solution prepared by dissolving 10.0 g of KCl in enough water to make 500 mL of solution? (Atomic weight of K=39, Cl=35.5 g/mol)
0.134 M
0.536 M
0.268 M
0.402 M
0.671 M
A solution of sucrose in water is 28.0% sucrose by mass and has a density of 1.118 g/mL. What mass of sucrose, in grams, is contained in 3.50 L of this solution?
1.096
1096
10.96
100.96
10096
