CHEM 1411. Review Exercises for Test 1 (chapter 1, 2, 3). Ky50.
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1) The law of constant composition applies to ________.
A) solutions
B) homogeneous mixtures
C) solids
D) heterogeneous mixtures
E) compounds
1)
2) Which one of the following has the element name and symbol correctly matched?
A) Fe, iron
B) Tn, tin
C) B, bromine
D) S, sodium
E) N, neon
2)
3) Homogeneous mixtures are also known as ________.
A) elements
B) solids
C) solutions
D) compounds
E) substances
3)
4) Gases and liquids share the property of ________.
A) incompressibility
B) compressibility
C) definite shape
D) indefinite shape
E) definite volume
4)
5) Which one of the following is the highest temperature?
A) 96 °F
B) 38 °C
C) 302 K
D) none of the above
E) the freezing point of water
5)
6) Of the objects below, ________ is the most dense.
A) an object with a volume of 13 dm 3 and a mass of 1.29 × 103 g
6)
B) an object with a volume of 139 mL and a mass of 93 g
C) an object with a volume of 3.91 × 10-24 nm3 and a mass of 7.93 × 10-1 ng
D) an object with a volume of 2.5 L and a mass of 12.5 kg
E) an object with a volume of 0.00212 m 3 and a mass of 4.22 × 104 mg
CHEM 1411. Review Exercises for Test 1 (chapter 1, 2, 3). Ky50., page 1
7) You have to calculate the volume of a gas sample with mass of 1.000 × 103 g and density of 1.027
g/L, but you have forgotten the formula. Which way of reasoning would help you in finding the
correct mass?
A) If 1.027 g of a gas takes up a volume of 1 L, then 1.000 × 103 g of the same gas takes up a
7)
volume of __________.
B) If 1.027 L of gas has a mass of 1 g, then __________ L has the mass of 1.000 × 103 g.
8) Iron has a density of 7.9 g/cm 3 . What is the mass of a cube of iron with the length of one side equal
to 55.0 mm?
A) 2.1 × 104 g
8)
B) 4.3 × 102 g
C) 2.3 × 10-2 g
D) 1.3 × 103 g
E) 1.4 g
9) Acceleration due to gravity of a free-falling object is 9.8 m/s 2 . Express this in
millimeters/millisecond2 .
A) 9.8 × 103
B) 9.8 × 10-6
C) 9.8 × 106
D) 9.8 × 10-9
9)
E) 9.8 × 10-3
10) If an object is accelerating at a rate of 25 m/s 2 , how fast will it be moving (in m/s) after 1.50 min?
(Assume an initial velocity of zero.)
A) 3.6
B) 17
C) 38
D) 0.060
E) 2.3 × 103
10)
11) How many significant figures should be retained in the result of the following calculation?
11)
A) 2
12.00000 × 0.9893 + 13.00335 × 0.0107
B) 3
C) 4
12) Round the number 3456.5 to two significant figures.
A) 3000.0
B) 3000
C) 3500
D) 5
E) 6
D) 3400.0
E) 3400
12)
13) A one degree of temperature difference is the smallest on the ________ temperature scale.
A) Kelvin
B) Fahrenheit and Celsius
C) Kelvin and Celsius
D) Celsius
E) Fahrenheit
13)
14) The length of the side of a cube having a density of 12.6 g/ml and a mass of 7.65 g is ________ cm.
A) 0.584
B) 3.20
C) 0.847
D) 1.32
E) 1.02
14)
15) Momentum is defined as the product of mass and velocity. The SI unit for momentum is ________.
kg ∙ m
g ∙ km
kg ∙ m
kg ∙ km
g ∙ m
B)
C)
D)
E)
A)
s
hr
s
s
hr
15)
CHEM 1411. Review Exercises for Test 1 (chapter 1, 2, 3). Ky50., page 2
16) ʺAbsolute zeroʺ refers to ________.
A) 273.15 °C
B) 0° Celsius
C) 0 Kelvin
D) 0° Fahrenheit
E) °C + 9/5(°F - 32)
16)
17) A certain liquid has a density of 2.67 g/cm 3 . 1340 g of this liquid would occupy a volume of
________ L.
A) 3.58
B) 50.2
C) 35.8
D) 1.99 × 10-3
17)
E) 0.502
18) Consider the following selected postulates of Daltonʹs atomic theory:
(i) Each element is composed of extremely small particles called atoms.
(ii) Atoms are indivisible.
(iii) Atoms of a given element are identical.
(iv) Atoms of different elements are different and have different properties.
Which of the postulates is(are) no longer considered valid?
A) (iii) only
B) (iii) and (iv)
C) (ii) only
D) (i) and (ii)
E) (ii) and (iii)
18)
19) All atoms of a given element have the same ________.
A) number of electrons and neutrons
B) mass
C) number of protons
D) density
E) number of neutrons
19)
20) Which atom has the largest number of neutrons?
A) potassium-39
B) chlorine-37
C) calcium-40
D) argon-40
E) phosphorus-30
20)
21) An atom of the most common isotope of gold, 197 Au, has ________ protons, ________ neutrons,
and ________ electrons.
A) 79, 118, 118
B) 79, 197, 197
C) 79, 118, 79
D) 197, 79, 118
E) 118, 79, 39
21)
CHEM 1411. Review Exercises for Test 1 (chapter 1, 2, 3). Ky50., page 3
22) Which isotope has 36 electrons in an atom?
80
36
78
A)
Kr
B)
Hg
C)
Se
36
80
34
22)
34
D)
Cl
17
80
E)
Br
35
23) The element X has three naturally occurring isotopes. The masses (amu) and % abundances of the
isotopes are given in the table below. The average atomic mass of the element is ________ amu.
23)
Isotope Abundance Mass
221X
74.22
220.9
220X
12.78
220.0
218X
13.00
218.1
A) 221.0
B) 220.42
C) 218.5
D) 219.7
E) 220.4
24) An unknown element is found to have three naturally occurring isotopes with atomic masses of
35.9675 (0.337%), 37.9627 (0.063%), and 39.9624 (99.600%). Which of the following is the unknown
element?
A) Ca
B) K
C) Cl
D) Ar
E) None of the above could be the unknown element.
24)
25) Which pair of elements would you expect to exhibit the greatest similarity in their physical and
chemical properties?
A) O, S
B) Si, P
C) C, N
D) H, He
E) K, Ca
25)
26) Which compounds do not have the same empirical formula?
A) C2 H4 O2 , C6 H12O6
26)
B) C2 H5 COOCH3 , CH 3 CHO
C) C2 H2, C6 H6
D) CO, CO 2
E) C2 H4, C3 H6
27) An empirical formula always indicates ________.
A) how many of each atom are in a molecule
B) which atoms are attached to which in a molecule
C) the isotope of each element in a compound
D) the geometry of a molecule
E) the simplest whole-number ratio of different atoms in a compound
27)
28) Which species has 16 protons?
A) 36Cl
B) 31P
C) 80Br-
D) 16O
E) 34S2-
29) Which species is an isotope of 39Cl?
A) 36ClB) 80Br
C) 39Ar
D) 40Ar+
E) 34S2-
28)
29)
CHEM 1411. Review Exercises for Test 1 (chapter 1, 2, 3). Ky50., page 4
30) Which formula/name pair is incorrect?
A) Fe 2 (SO3 )3
iron(III) sulfite
B) FeSO 3
C) FeSO 4
D) FeS
E) Fe 2 (SO4 )3
30)
iron(II) sulfite
iron(II) sulfate
iron(II) sulfide
iron(III) sulfide
31) Which one of the following compounds is copper(I) chloride?
A) Cu2 Cl3
B) CuCl
C) Cu2 Cl
31)
D) Cu3 Cl2
E) CuCl2
32) The correct name for NaHCO 3 is ________.
32)
A) persodium carbonate
B) sodium hydride
C) carbonic acid
D) sodium bicarbonate
E) persodium hydroxide
33) Which element forms an ion with the same charge as the ammonium ion?
A) nitrogen
B) potassium
C) oxygen
D) calcium
E) chlorine
33)
34) Which metal does not form cations of differing charges?
A) Cu
B) Fe
C) Na
E) Sn
34)
D) Co
35)
35) Of the reactions below, which one is not a combination reaction?
A) 2N2 + 3H2 → 2NH3
B) 2Mg + O2 → 2MgO
C) 2CH 4 + 4O2 → 2CO 2 + 4H2 O
D) C + O2 → CO2
E) CaO + H2 O → Ca(OH)2
36) Which of the following are combustion reactions?
1) CH 4 (g) + O2 (g) → CO2 (g) + H2 O (l)
36)
2) CaO (s) + CO2 (g) → CaCO3 (s)
3) PbCO3 (s) → PbO (s) + CO2 (g)
4) CH 3 OH (l) + O2 (g) → CO2 (g) + H2 O (l)
A) 3 and 4
B) 1 and 4
C) 1, 2, 3, and 4
D) 1, 3, and 4
E) 2, 3, and 4
37) The formula weight of potassium dichromate (K 2 Cr2 O7 ) is ________ amu.
A) 294.18
B) 255.08
C) 242.18
D) 107.09
37)
E) 333.08
38) The formula weight of magnesium fluoride (MgF 2 ), rounded to one decimal place, is ________
amu.
A) 62.3
B) 86.6
C) 67.6
D) 92.9
E) 43.3
CHEM 1411. Review Exercises for Test 1 (chapter 1, 2, 3). Ky50., page 5
38)
39) Calculate the percentage by mass of lead in Pb(NO 3 )2 .
A) 38.6
B) 44.5
C) 65.3
40) One mole of ________ contains the smallest number of atoms.
A) Na3 PO4
B) NaCl
C) C10H8
39)
D) 71.2
E) 62.6
D) Al2 (SO4 )3
E) S8
40)
41) A sample of CH2 F2 with a mass of 19 g contains ________ atoms of F.
B) 3.3 × 1024
A) 9.5
C) 4.4 × 1023
D) 2.2 × 1023
41)
E) 38
42) How many oxygen atoms are there in 52.06 g of carbon dioxide?
A) 6.022 × 1023
42)
B) 1.424 × 1024
C) 1.204 × 1024
D) 5.088 × 1023
E) 1.018 × 1024
43)
43) A sulfur oxide is 50.0% by mass sulfur. This molecular formula could be ________.
A) S2 O4
B) SO2
C) S2 O
D) SO
E) either SO 2 or S2 O4
44)
44) When the following equation is balanced, the coefficients are ________.
Al(NO3 )3 + Na2 S → Al2 S3 + NaNO3
A) 2, 3, 2, 3
B) 2, 1, 3, 2
C) 2, 3, 1, 6
D) 1, 1, 1, 1
E) 4, 6, 3, 2
45)
45) When the following equation is balanced, the coefficient of O 2 is ________.
C2 H4 O (g) + O2 (g) → CO2 (g) + H2 O (g)
A) 1
B) 2
C) 5
D) 3
E) 4
46) There are ________ sulfur atoms in 25 molecules of C 4 H4 S2 .
A) 1.5 × 1025
B) 50
C) 4.8 × 1025
D) 6.02 × 1023
E) 3.0 × 1025
CHEM 1411. Review Exercises for Test 1 (chapter 1, 2, 3). Ky50., page 6
46)
47) Calcium carbide (CaC2 ) reacts with water to produce acetylene (C 2 H2 ):
47)
CaC2 (s) + 2H2 O (g) → Ca(OH)2 (s) + C2 H2 (g)
The complete reaction of 57.4 g of CaC 2 requires consumption of ________ g of H 2 O.
A) 18.0
B) 32.3
C) 1.79
D) 0.895
E) 64.1
48) Under appropriate conditions, nitrogen and hydrogen undergo a combination reaction to yield
ammonia:
48)
N2 (g) + 3H2 (g) → 2NH 3 (g)
If the reaction yield is 87.5%, how many moles of N 2 are needed to produce 3.00 mol of NH 3 ?
A) 1.5
B) 2.32
C) 1.00
D) 0.166
E) 1.71
49)
49) A 3.82-g sample of magnesium nitride is reacted with 7.73 g of water:
Mg 3 N2 + 3H2 O → 2NH3 + 3MgO
The yield of MgO is 3.60 g. What is the percent yield in the reaction?
A) 49.4
B) 46.6
C) 94.5
D) 99.9
E) 78.4
50) The formula weight of LiClO4 is ________ amu.
A) 101.0
B) 106.3
C) 58.3
50)
D) 212.3
E) 52.0
CHEM 1411. Review Exercises for Test 1 (chapter 1, 2, 3). Ky50., page 7
Answer Key
Testname: CHEM 1411. REVIEW EXERCISES FOR TEST 1 (CHAPTER 1, 2, 3). KY50.
1) E
2) A
3) C
4) D
5) B
6) C
7) A
8) D
9) E
10) E
11) B
12) C
13) E
14) C
15) D
16) C
17) E
18) E
19) C
20) D
21) C
22) A
23) E
24) D
25) A
26) D
27) E
28) E
29) A
30) E
31) B
32) D
33) B
34) C
35) C
36) B
37) A
38) A
39) E
40) B
41) C
42) B
43) E
44) C
45) C
46) B
47) B
48) E
49) E
50) B
CHEM 1411. Review Exercises for Test 1 (chapter 1, 2, 3). Ky50., page 8