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Chemistry: A Molecular Approach, Second Cdn. Ed. (Tro)
Chapter 2 Atoms and Elements
2.1 Multiple Choice Questions
1) In a chemical reaction, matter is neither created nor destroyed. Which law does this refer to?
A) Law of definite proportions
B) Law of the conservation of mass
C) Law of modern atomic theory
D) Law of multiple proportions
E) First law of thermodynamics
Answer: B
Diff: 1 Type: MC Var: 1 Page Ref: 2.3
2) If 3.6 g of chlorine combines with sodium to make 6.0 g of sodium chloride, what mass of
sodium is required?
A) 3.6 g
B) 2.4 g
C) 6.0 g
D) 9.6 g
E) 1.2 g
Answer: B
Diff: 3 Type: MC Var: 1 Page Ref: 2.3
3) What mass of calcium is required to produce 4.2 g of calcium bromide, starting with 3.4 g of
bromine?
A) 0.4 g
B) 3.4 g
C) 4.2 g
D) 1.6 g
E) 0.8 g
Answer: E
Diff: 3 Type: MC Var: 1 Page Ref: 2.3
4) All samples of a given compound, regardless of their source or how they were prepared, have
the same proportions of their constituent elements. Which law does this refer to?
A) Law of definite proportions
B) Law of the conservation of mass
C) Law of modern atomic theory
D) Law of multiple proportions
E) First law of thermodynamics
Answer: A
Diff: 1 Type: MC Var: 1 Page Ref: 2.3
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5) If 26.0 g of water, O, is found to contain 2.9 g of hydrogen and 23.1 g of oxygen, how
much hydrogen and oxygen, in grams, is contained in 32.0 g of water?
A) 3.6 g hydrogen and 28.4 g oxygen
B) 28.4 g hydrogen and 3.6 g oxygen
C) 26.0 g hydrogen and 28.4 g oxygen
D) 3.6 g hydrogen and 2.9 g oxygen
E) 2.9 g hydrogen and 28.4 g oxygen
Answer: A
Diff: 3 Type: MC Var: 1 Page Ref: 2.3
6) When two elements, A and B, form two different compounds, the masses of element B that
combine with 1 g of element A can be expressed as a ratio of small whole numbers. Which law
does this refer to?
A) Law of definite proportions
B) Law of the conservation of mass
C) Law of modern atomic theory
D) Law of multiple proportions
E) First law of thermodynamics
Answer: D
Diff: 1 Type: MC Var: 1 Page Ref: 2.3
7) If 6.0 g of carbon combines with 16.0 g of oxygen to form 22.0 g of carbon dioxide, how
much carbon and oxygen, in grams, is in 28.7 g carbon dioxide?
A) 20.9 g carbon and 7.8 g oxygen
B) 20.9 g carbon and 10.5 g oxygen
C) 7.8 g carbon and 20.9 g oxygen
D) 7.8 g carbon and 10.5 g oxygen
E) 3.9 g carbon and 20.9 g oxygen
Answer: C
Diff: 3 Type: MC Var: 1 Page Ref: 2.3
8) Dalton's atomic theory states
A) that all elements have several isotopes.
B) that matter is composed of small indestructible particles.
C) that the properties of matter are determined by the properties of atoms.
D) that energy is neither created nor destroyed during a chemical reaction.
E) that an atom is predominantly empty space.
Answer: B
Diff: 1 Type: MC Var: 1 Page Ref: 2.3
2
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9) Which of the following is an example of the law of multiple proportions?
A) A sample of chlorine is found to contain three times as much Cl-35 as Cl-37.
B) Two different compounds formed from carbon and oxygen have the following mass ratios:
1.33 g O:1 g C and 2.66 g O:1 g C.
C) Two different samples of table salt are found to have the same ratio of sodium to chlorine.
D) The atomic mass of bromine is found to be 79.90 amu.
E) Nitrogen dioxide always has a mass ratio of 2.28 g O:1 g N.
Answer: B
Diff: 1 Type: MC Var: 1 Page Ref: 2.3
10) Which of the following statements is TRUE according to Dalton's atomic theory?
A) Atoms combine in simple fraction ratios to form compounds.
B) All atoms of chlorine have identical properties to other elements with similar mass.
C) Atoms of carbon can be changed into atoms of oxygen when creating carbon dioxide.
D) Atoms of carbon do not change into another element during a chemical reaction with
chlorine.
E) An atom of nitrogen can be broken down into smaller particles that will still have the unique
properties of nitrogen.
Answer: D
Diff: 1 Type: MC Var: 1 Page Ref: 2.3
11) Identify the description of an atom.
A) neutrons and electrons in nucleus; protons in orbitals
B) neutrons in nucleus; protons and electrons in orbitals
C) protons and neutrons in nucleus; electrons in orbitals
D) protons and electrons in nucleus; neutrons in orbitals
E) electrons in nucleus; protons and neutrons in orbitals
Answer: C
Diff: 1 Type: MC Var: 1 Page Ref: 2.4
12) Identify the charges of protons, neutrons, and electrons.
A) protons +1, neutrons 0, electrons -1
B) protons 0, neutrons -1, electrons +1
C) protons -1, neutrons 0, electrons +1
D) protons 0, neutrons +1, electrons -1
E) protons +1, neutrons -1, electrons 0
Answer: A
Diff: 1 Type: MC Var: 1 Page Ref: 2.4
13) Isotopes differ in the number of what particle?
A) beta particles
B) protons
C) electrons
D) neutrons
E) gamma particles
Answer: D
Diff: 1 Type: MC Var: 1 Page Ref: 2.4
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Chemistry: A Molecular Approach, Second Cdn. Ed. (Tro)
Chapter 2 Atoms and Elements
2.1 Multiple Choice Questions
1) In a chemical reaction, matter is neither created nor destroyed. Which law does this refer to?
A) Law of definite proportions
B) Law of the conservation of mass
C) Law of modern atomic theory
D) Law of multiple proportions
E) First law of thermodynamics
Answer: B
Diff: 1 Type: MC Var: 1 Page Ref: 2.3
2) If 3.6 g of chlorine combines with sodium to make 6.0 g of sodium chloride, what mass of
sodium is required?
A) 3.6 g
B) 2.4 g
C) 6.0 g
D) 9.6 g
E) 1.2 g
Answer: B
Diff: 3 Type: MC Var: 1 Page Ref: 2.3
3) What mass of calcium is required to produce 4.2 g of calcium bromide, starting with 3.4 g of
bromine?
A) 0.4 g
B) 3.4 g
C) 4.2 g
D) 1.6 g
E) 0.8 g
Answer: E
Diff: 3 Type: MC Var: 1 Page Ref: 2.3
4) All samples of a given compound, regardless of their source or how they were prepared, have
the same proportions of their constituent elements. Which law does this refer to?
A) Law of definite proportions
B) Law of the conservation of mass
C) Law of modern atomic theory
D) Law of multiple proportions
E) First law of thermodynamics
Answer: A
Diff: 1 Type: MC Var: 1 Page Ref: 2.3
1
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,DOWNLOAD THE Test Bank for Chemistry Molecular Approach 2nd Edition Tr
5) If 26.0 g of water, O, is found to contain 2.9 g of hydrogen and 23.1 g of oxygen, how
much hydrogen and oxygen, in grams, is contained in 32.0 g of water?
A) 3.6 g hydrogen and 28.4 g oxygen
B) 28.4 g hydrogen and 3.6 g oxygen
C) 26.0 g hydrogen and 28.4 g oxygen
D) 3.6 g hydrogen and 2.9 g oxygen
E) 2.9 g hydrogen and 28.4 g oxygen
Answer: A
Diff: 3 Type: MC Var: 1 Page Ref: 2.3
6) When two elements, A and B, form two different compounds, the masses of element B that
combine with 1 g of element A can be expressed as a ratio of small whole numbers. Which law
does this refer to?
A) Law of definite proportions
B) Law of the conservation of mass
C) Law of modern atomic theory
D) Law of multiple proportions
E) First law of thermodynamics
Answer: D
Diff: 1 Type: MC Var: 1 Page Ref: 2.3
7) If 6.0 g of carbon combines with 16.0 g of oxygen to form 22.0 g of carbon dioxide, how
much carbon and oxygen, in grams, is in 28.7 g carbon dioxide?
A) 20.9 g carbon and 7.8 g oxygen
B) 20.9 g carbon and 10.5 g oxygen
C) 7.8 g carbon and 20.9 g oxygen
D) 7.8 g carbon and 10.5 g oxygen
E) 3.9 g carbon and 20.9 g oxygen
Answer: C
Diff: 3 Type: MC Var: 1 Page Ref: 2.3
8) Dalton's atomic theory states
A) that all elements have several isotopes.
B) that matter is composed of small indestructible particles.
C) that the properties of matter are determined by the properties of atoms.
D) that energy is neither created nor destroyed during a chemical reaction.
E) that an atom is predominantly empty space.
Answer: B
Diff: 1 Type: MC Var: 1 Page Ref: 2.3
2
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, DOWNLOAD THE Test Bank for Chemistry Molecular Approach 2nd Edition Tr
9) Which of the following is an example of the law of multiple proportions?
A) A sample of chlorine is found to contain three times as much Cl-35 as Cl-37.
B) Two different compounds formed from carbon and oxygen have the following mass ratios:
1.33 g O:1 g C and 2.66 g O:1 g C.
C) Two different samples of table salt are found to have the same ratio of sodium to chlorine.
D) The atomic mass of bromine is found to be 79.90 amu.
E) Nitrogen dioxide always has a mass ratio of 2.28 g O:1 g N.
Answer: B
Diff: 1 Type: MC Var: 1 Page Ref: 2.3
10) Which of the following statements is TRUE according to Dalton's atomic theory?
A) Atoms combine in simple fraction ratios to form compounds.
B) All atoms of chlorine have identical properties to other elements with similar mass.
C) Atoms of carbon can be changed into atoms of oxygen when creating carbon dioxide.
D) Atoms of carbon do not change into another element during a chemical reaction with
chlorine.
E) An atom of nitrogen can be broken down into smaller particles that will still have the unique
properties of nitrogen.
Answer: D
Diff: 1 Type: MC Var: 1 Page Ref: 2.3
11) Identify the description of an atom.
A) neutrons and electrons in nucleus; protons in orbitals
B) neutrons in nucleus; protons and electrons in orbitals
C) protons and neutrons in nucleus; electrons in orbitals
D) protons and electrons in nucleus; neutrons in orbitals
E) electrons in nucleus; protons and neutrons in orbitals
Answer: C
Diff: 1 Type: MC Var: 1 Page Ref: 2.4
12) Identify the charges of protons, neutrons, and electrons.
A) protons +1, neutrons 0, electrons -1
B) protons 0, neutrons -1, electrons +1
C) protons -1, neutrons 0, electrons +1
D) protons 0, neutrons +1, electrons -1
E) protons +1, neutrons -1, electrons 0
Answer: A
Diff: 1 Type: MC Var: 1 Page Ref: 2.4
13) Isotopes differ in the number of what particle?
A) beta particles
B) protons
C) electrons
D) neutrons
E) gamma particles
Answer: D
Diff: 1 Type: MC Var: 1 Page Ref: 2.4
3
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