GENERAL CHEMISTRY I – CHM201
Unit 1 Practice Test 2
This test is intended to help you get acquainted with the types of questions you will be asked on the Unit Test administered at
the end of the unit. The answers are included at the end of the test. Do not pass in your answers to this test. This is optional
and will not be graded. Feel free to seek any help you wish on these questions. A mastery of the topics covered in them will
assure a good performance on the tests that count.
1. Of the following which is NOT a pure substance?
A) gold
B) sugar
C) water
D) air
E) methane
2. Which of the following is an example of a physical property?
A) corrosiveness of sulfuric acid
B) toxicity of cyanide
C) flammability of gasoline
D) neutralization of stomach acid with an antacid
E) lead becomes a liquid when heated to 601◦C
3. The element gallium melts at 29.8°C. What temperature is this in K?
A) -243.4K
B) 243.4K
C) 302.95K
D) 302.9K
E) 303.0K
4. How many milliliters is 0.005 L?
A) 0.5 mL
B) 5 mL
C) 0.50 mL
D) 0.000005 mL
E) 200 mL
5. Bromine is a red liquid at 25°C. Its density is 3.12 g/cm3. What is the volume of 28.1 g of liquid bromine?
A) 87.7 cm3
B) 0.111 cm3
C) 9.01 cm3
D) 28.1 cm3
E) None of the above
6. You just measured a ball of clear plastic and obtained the following information:
mass = 13.7882 g
radius = 1.535 cm
Which of the following statements concerning the plastic is true? (The formula for the volume of a sphere is V=4/3 πr3.)
A) Volume = 15.15 cm3; density = 1.099 g/cm3; the object floats on water.
B) Volume = 15.15 cm3; density = 1.099 g/cm3; the object sinks in water.
C) Volume = 15.15 cm3; density = 0.9101 g/cm3; the object sinks in water.
D) Volume = 15.15 cm3; density = 0.9101 g/cm3; the object floats on water.
E) Volume = 14.13 cm3; density = 0.9753 g/cm3; the object floats on water.
7. Express the number 0.000053 in scientific notation.
A) 5.3 × 10-2
B) 5.3 × 10-3
C) 5.3 × 10-4
D) 5.3 × 10-5
E) 5.3 × 10-6
8. How many significant figures does the result of the following operation contain?
(1.5 × 10–4 × 61.3) + 2.01 =
A) 1
B) 2
C) 3
D) 4
E) 5
9. Calculate the mass of the air contained in a room that measures 2.50 m × 5.50 m × 3.00 m (density of air = 1.29 g/dm3 at 25°C).
A) 3.13 × 10–5 g
B) 32.0 kg
C) 53.2 kg
D) 53.2 g
E) None of the above.
10. Choose the answer with the correct number of significant figures and units to the problem below. (3.45 m + 2.78 m)/ 565 s =
A) 1.10 x 10-2 m2/s
B) 1.10 x 10-2 m/s
C) 1.10 x 10-2 s-1
D) 1.10 x 10-2 s
E) 1.10 x 10-2 m2
11. Radio waves travel at the speed of light, which is 3.00 × 10 8 m/s. How many kilometers will radio messages travel in exactly
one year?
A) 9.46 × 1015 km
B) 7.30 × 108 km
C) 7.10 × 1010 km
D) 9.46 × 1012 km
E) 3.33 × 10–3 km
12. Give the number of protons (p), neutrons (n), and electrons E) in one atom of 238U.
A) 146 p, 92 n, 92 e
B) 92 p, 92 n, 92 e
C) 92 p, 146 n, 92e
D) 146 p, 28 n, 146 e
E) 238 p, 146 n, 238 e
13. Complete the following chart, in order from left to right
Ion
56Fe3+
A) 56, 26, 30, 23
B) 56, 26, 30, 26
C) 56, 26, 30, 24
D) 56, 26, 56, 26
E) 56, 56, 26, 54
Mass Number
Protons
Neutrons
Electrons
14. Which of the following elements is chemically similar to magnesium?
A) sulfur
B) calcium
C) iron
D) nickel
E) potassium
15. What are the two different ions present in the compound Na 2S?
A) Na2+, S2B) Na+, S2C) Na2+, S2D) Na+, SE) Na2+, S16. What is the empirical formula for C6H14O?
A) C6H14O
B) C3H7O
C) C2H7O
D) C12H28O2
E) CHO
17. What is the formula for the ionic compound containing barium ions and sulfate ions?
A) BaSO4
B) Ba2SO4
C) BaS
D) Ba(SO4)2
E) Ba3S2
18. What are the two different ions present in the compound Al(NO 3)3?
A) Al3+, (NO3-)3
B) Al+, NO3C) Al3+, NO3D) Al3+, NO33E) Al+, (NO3)319. Name the compound CuSO4.
A) Copper (I) sulfate
B) Copper (I) sulfite
C) Copper (II) sulfite
D) Copper (II) sulfate
E) Copper (IV) sulfate
20. Give the formula for nickel(II) sulfite.
A) NiSO
B) NiSO3
C) Ni2SO4
D) Ni2(SO3)
E) NiS2
21. Select True or False: The formula of hydrosulfuric acid is H 2S.
A) True
B) False
22. Select True or False: The following list shows the nitride ion, nitrate ion, and nitrite ion, in order.
N3-, NO3-, and NO2A) True
B) False
Unit 1 Practice Test 2 Answers (CHM201)
1. D
2. E
3. E
4. B
5. C
6. D
7. D
8. C
9. C
10. B
11. D
12. C
13. A
14. B
15. B
16. A
17. A
18. C
19. D
20. B
21. A
22. A