Name: __________________________ Date: _____________
1. Two electronic balances are tested using a standard weight. The true mass of the
standard is 5.0000 g. The results of 5 individual measurements on each balance
are recorded below.
average mass =
Balance A
5.2895 g
5.1077 g
4.6407 g
4.8947 g
5.0672 g
5.0000 g
Balance B
5.0001 g
4.9998 g
4.9999 g
5.0002 g
4.9999 g
5.0000 g
Which statement best describes the results?
A) A: poor precision, good accuracy. B: good precision, good accuracy.
B) A: good precision, good accuracy. B: poor precision, good accuracy.
C) A: good precision, good accuracy. B: good precision, poor accuracy.
D) A: poor precision, good accuracy. B: good precision, poor accuracy.
E) A: good precision, poor accuracy. B: poor precision, good accuracy.
2. What is the correct answer to the expression below?
A)
B)
C)
D)
E)
2 cm
2.03 cm
2.0320 cm
2.032 cm
2.0 cm
3. A column of liquid is found to expand linearly on heating. Assume the column rises
5.25 cm for a 10.0 °F rise in temperature. If the initial temperature of the liquid is 98.6
°F, what will be the final temperature in °C if the liquid has expanded by 18.5 cm?
A) 56.6 °C
B) 134 °C
C) 19.0 °C
D) 13.4 °C
E) 122 °C
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4. A copper wire (density = 8.96 g/cm3) has a diameter of 0.25 mm. If a sample of this
wire has a mass of 22.0 g, how long is this wire? ( Given: V = πr2 × l, where l = length
of the wire)
A) 5.0 x103 cm
B) 5.0 x 103 mm
C) 4.9 x 104 cm
D) 4.9 x 104 mm
E) 2.8 x 104 mm
5. Gases and liquids share the property of ________.
A) indefinite shape
B) definite shape
C) compressibility
D) incompressibility
E) definite volume
6. A neutral atom of the isotope 197Au contains
A) 79 protons and 118 neutrons.
B) 197 neutrons and 276 electrons.
C) 197 protons, 79 neutrons, and 197 electrons.
D) 197 protons and 118 electrons.
E) 79 protons and 197 neutrons.
7. Which of these are incorretly name molecule(s)?
I. CaO, Calcium monoxide
II. FePO4, Iron (II) phosphate
III Na2O2, Sodium oxide
A) All of them
B) I and II only
C) I and III only
D) II and III only
E) I only
8. Which of the following is/are type of radioactive radiation(s) which has no charge and is
unaffected by external electric or magnetic fields?
A)  rays
B)  rays
C)  rays
D) Both  and rays
E) All , andrays
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9. Calculate the amu for the 30Si from the data given below:
(Note: The average atomic mass of Si is 28.085500)
Isotope
Isotopic Mass (amu)
Abundance %
28
Si
27.976927
92.23
29
Si
28.976495
4.67
30
Si
?
3.10
A) 29.973
B) 28.973
C) 27.974
D) 28.984
E) 27.984
10. The binary compound P2O3 is properly named:
A) diphosphorous trioxide
B) phosphorous oxide
C) phosphorous(III) oxide
D) diphosphorous ozone
E) phosphorous trioxide
11. A 1.850 g mixture of SrCO3 and SrO is heated. The SrCO3 decomposes to SrO and CO2.
What is the mass percentage of SrCO3 in the mixture if the mass after heating is 1.445
g?
A) 73.4%
B) 26.6%
C) 21.9%
D) 13.7%
E) 78.1%
12. What is coefficient of O2, when the following chemical reaction is balanced with the
smallest whole coefficients?
Cu3FeS3(s) +
O2(g) → Cu(s) + FeO(s) + SO2(g)
A) 7
B) 6
C) 9
D) 8
E) 5
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13. Consider the following unbalanced reaction: P4(s) + F2(g) → PF3(g)
What mass of F2 is needed to produce 120. g of PF3 if the reaction is 78.1 % yield?
A) 99.6 g
B) 154 g
C) 103 g
D) 66.5 g
E) 77.0 g
14. What is the mass, in grams, of one arsenic (As) atom ?
A) 1.24 × 10–22 g
B) 5.48 × 10–23 g
C) 33.0 g
D) 74.9 g
E) 8.04 × 10-21 g
15. What is the empirical formula for a 100 g sample containing 87.42 g of nitrogen and
12.58 g of hydrogen?
A) NH2
B) NH
C) N2H
D) NH3
E) NH4
16. Select a balanced chemical equation for the reaction of aqueous solutions of magnesium
chloride and potassium phosphate.
A) 3 MgCl2(aq) + 2 K3PO4(aq) → Mg3(PO4)2(s) + 6 KCl(aq)
B) MgCl2(aq) + K3PO4(aq) → K3Mg(s) + PO4Cl2(aq)
C) 3 MgCl2(aq) + 2 K3PO4(aq) → 3 K2Mg(s) + 2 PO4Cl3(aq)
D) MgCl(aq) + KPO4(aq) → MgPO4(s) + KCl(aq)
E) MgCl2(aq) + 2 KPO4(aq) → Mg(PO4)2(s) + 2 KCl(aq)
17. 47.8 mg of silver nitrate was dissolved in water to make 10.00 mL of solution. 3.00 mL
of that solution was used to make a new solution with a total volume of 1.000 L. What
was the concentration of the silver ion in the final solution?
A) 8.44 x 10–5 M
B) 1.43 x 10–2 M
C) 8.44 x 10–3 M
D) 14.3 M
E) 0.0281 M
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18. 175.0 mL of 0.25 M HCl is added to 105.0 mL of 0.55 M Ba(OH)2 solution. What is
the concentration of the excess H+ or OH- left in the solution?
A) 0.26 M OHB) 0.16 M OHC) 0.12 M H+
D) 0.072 M H+
E) 0.044 M H+
19. What is the oxidation number for oxygen in hydrogen peroxide?
A) -1
B) +1
C) 0
D) -2
E) +2
20. A mixture contains only NaCl and Al2(SO4)3. A 1.45 g sample of the mixture dissolved
in water and an excess of NaOH is added, producing a precipitate of Al(OH)3. The
precipitate is filtered and dried and weighed. The mass of the precipitate is 0.107 g.
What is the mass % of Al2(SO4)3 in the sample?
A) 16.2 %
B) 23.5 %
C) 2.35 %
D) 14.5 %
E) 21.5 %
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Answer Key
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