CHEM 103 Exam 1 Questions And
Answers
Which of the following represents the smallest mass?
3.5 x 105 ng
350 mg
3.5 x 10-8 kg
3.5 x 109 μg
0.035 g
Which of the following numbers has exactly four significant figures?
0.007
4.03 x 108
1.00739
2660
1.280
If the following calculations are carried out, how many significant figures should
be reported in the answer?
22.85−10..009975
1
2
3
4
5
Which of the following statements about glucose, C6H12O6, is correct?
Glucose is a mixture.
A physical process could separate a sample of glucose into simpler substances
Glucose is a pure substance.
Glucose cannot be separated into simpler substances by any means.
More than one of the above is correct.
Glucose is a pure substance
Which of the following best describes a property of a gas?
The atoms/molecules are typically very close together.
, The atoms/molecules can move relative to each other. This allows gasses to take
the shape of their container.
The atoms/molecules are arranged in an ordered crystal structure.
Gasses can be the solvent in a solution, but they cannot be solutes.
Molecular gasses conduct electricity.
The atoms/molecules can move relative to each other. This allows gasses to take the
shape of their container.
Which of the following is the correct symbol for an isotope that contains 35
protons and 44 neutrons?
44Ru
44Br
79Ru
79Au
79Br
What do all of the following have in common?
13C 15O2- 14N+
They have the same number of protons
They have the same number of electrons
They have the same number of neutrons
They have the same mass number
More than one of the other options is correct.
The active ingredient in the allergy medication benadryl has a molecular formula
of C17H21 What is the mass of 0.585 moles of this compound?
318 g
149 g
585 g
255 g
475 g
How many moles of He gas are present in a sample that contains 2.983 x 1024 He
atoms?
4.954 moles
2.983 x 1024 moles
1.796 moles
2.983 moles
1.796 x 1048 moles
Answers
Which of the following represents the smallest mass?
3.5 x 105 ng
350 mg
3.5 x 10-8 kg
3.5 x 109 μg
0.035 g
Which of the following numbers has exactly four significant figures?
0.007
4.03 x 108
1.00739
2660
1.280
If the following calculations are carried out, how many significant figures should
be reported in the answer?
22.85−10..009975
1
2
3
4
5
Which of the following statements about glucose, C6H12O6, is correct?
Glucose is a mixture.
A physical process could separate a sample of glucose into simpler substances
Glucose is a pure substance.
Glucose cannot be separated into simpler substances by any means.
More than one of the above is correct.
Glucose is a pure substance
Which of the following best describes a property of a gas?
The atoms/molecules are typically very close together.
, The atoms/molecules can move relative to each other. This allows gasses to take
the shape of their container.
The atoms/molecules are arranged in an ordered crystal structure.
Gasses can be the solvent in a solution, but they cannot be solutes.
Molecular gasses conduct electricity.
The atoms/molecules can move relative to each other. This allows gasses to take the
shape of their container.
Which of the following is the correct symbol for an isotope that contains 35
protons and 44 neutrons?
44Ru
44Br
79Ru
79Au
79Br
What do all of the following have in common?
13C 15O2- 14N+
They have the same number of protons
They have the same number of electrons
They have the same number of neutrons
They have the same mass number
More than one of the other options is correct.
The active ingredient in the allergy medication benadryl has a molecular formula
of C17H21 What is the mass of 0.585 moles of this compound?
318 g
149 g
585 g
255 g
475 g
How many moles of He gas are present in a sample that contains 2.983 x 1024 He
atoms?
4.954 moles
2.983 x 1024 moles
1.796 moles
2.983 moles
1.796 x 1048 moles
