Chem 1010 - General Chemistry 1 » Fall 2021 » Exam 1
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Question #1
A piece of metal that has a mass of 10.72 g was placed in water and the water level rose to 68.3 mL. If the density of the metal is 1.60 g/mL, what was the initial volume of the water? Report your answer to the correct number of significant figures.
A.
35.3 mL
B.
61.6 mL
C.
66.0 mL
D.
28.5 mL
Question #2
Is CH4 an ionic or covalent compound?
A.
Neither
B.
ionic
C.
covalent
Question #3
Which of the following does not form a diatomic molecular element?
A.
bromine
B.
nitrogen
C.
hydrogen
D.
sulfur
Question #4
Which is true for 24Mg2+ , 25Mg2+ , and 26Mg2+?
A.
Each has a different number of protons.
B.
Each has the same mass number.
C.
Each has a different number of neutrons.
D.
Each has a different number of electrons.
Question #5
Which of the following have the same number of electrons?
A.
O2- , F- , Ar
B.
P3- , S2- , K+
C.
O2- , S2- , Se2-
D.
Na+ , K+ , Li+
Question #6
If 29.5 mL of a solution having a density of 1.35 g/mL is mixed with 43.3 mL of a solution having a density of 0.980 g/mL, what is the density of the final mixture?
A.
0.728 g/mL
B.
1.21. g/mL
C.
1.13 g/mL
D.
0.885 g/mL
Question #7
Which, if any, of the following is true for ionic compounds?
A.
They only have empirical formulas.
B.
Roman numerals are never used in their names.
C.
They involve the equal sharing of electrons between atoms.
D.
None of the above are true.
Question #8
What is the mass percent of oxygen in Nitric Acid?
A.
68.06
B.
76.17
C.
62.32
D.
51.58
Question #9
A compound has a formula that is N2X3 where X is an unknown element. If the compound has a molar mass of 124.20, what is the identity of X?
A.
trioxygen
B.
oxygen
C.
sulfur
D.
trisulfur
Question #10
Which, if any, of the following would not typically have a -3 charge in an ionic compound?
A.
N
B.
Sb
C.
P
D.
All have a -3 charge in an ionic compound.
Question #11
What is the correct chemical name for Co(NO2)2?
A.
Cobalt(II) Nitrate
B.
Cobalt Nitrate
C.
Cobalt Nitride
D.
Cobalt(II) Nitrite
Question #12
According to the following figure, what is the volume of the water in the graduated cylinder?
A.
68.3 mL
B.
68.83 mL
C.
68 mL
D.
71.8 mL
Question #13
If an isotope of an unknown element (x) is 4+ ; which of the following is true about it?
A.
It has 28 neutrons.
B.
It has 4 electrons.
C.
The atomic mass is 51.
D.
It has 51 protons.
Question #14
Which of the following is true about binary ionic compounds?
A.
The name ends in “ate”.
B.
The name ends in “ide”.
C.
The name cannot contain a roman numeral.
D.
The name ends in “ite”.
Question #15
What is the correct formula for Potassium Nitrite?
A.
KNO3
B.
K3N
C.
KN
D.
KNO2
Question #16
How many grams of selenium are in 5.98x1022 atoms of selenium?
A.
7.84
B.
7.84x1046
C.
795
D.
79.5
Question #17
What is the chemical name for Fe(OH)3 ?
A.
Iron (III) Hydroxide
B.
Iron Hydrogen Oxygen
C.
Iron Hydroxide
Question #18
How many square feet are in 9.85x103 square centimeters? 1.00 in = 2.54 cm; 12 in = 1 foot (exact)
A.
68.4
B.
127
C.
10.6
D.
323
Question #19
What is the mass in kg of 6.89x1025 molecules of NO2 ?
A.
5.26x1049
B.
5.26
C.
3.43
D.
3.03x1024
Question #20
Which of the following is a possible molecular formula for a compound that has and empirical formula of CHO2 ?
A.
C2H4O2
B.
C2H2O4
C.
C3H3O4
D.
None of the above.
Question #21
A compound has an empirical formula of PO2 and a molar mass of 314.85; which of the following is the compound?
A.
P5O10
B.
P5O5
C.
P5O8
D.
PO5
Question #22
Which of the following is the correct formula for sulfurous acid?
A.
H2SO4
B.
HSO4
C.
H2SO3
D.
H2S
Question #23
What is the mass in kg of 6.89x1025 molecules of CO2 ?
A.
5.04
B.
3.03x1024
C.
0.144
D.
5.04x103
Question #24
You have a penny that has a mass of 2.458 g and is 2.40 % copper by mass. How many copper atoms are in the penny?
A.
2.33x1022
B.
4.12x1022
C.
3.55x1022
D.
5.59x1020
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