Chem 1010 - General Chemistry 1 » Fall 2021 » Chapter 2 Chemical Compounds (2)
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Question #1
Which of these statements is true about electrons?
A.
Electrons are found in the nucleus.
B.
Electrons have a positive charge.
C.
Electrons are found in the region surrounding the nucleus.
D.
Electrons have the same mass as the proton.
Question #2
Which one of these designations is appropriate for an atom of nitrogen that has seven protons and seven neutrons ?
A.
15N 7
B.
7N 14
C.
7N 7
D.
14N 7
Question #3
How many neutrons are in the nucleus of 29Si?
A.
15
B.
29
C.
14
D.
16
Question #4
The element Erbium, Er, has five abundant isotopes 164Er, 166Er, 167Er, 168Er, and 170Er. The difference among these five isotopes is the ______.
A.
charge in each proton
B.
total charge
C.
charge on each electron
D.
number of atoms in one mole
E.
number of neutrons
Question #5
What is the most common charge observed for the ion of selenium?
A.
1
B.
-3
C.
-2
D.
-1
Question #6
What is the correct name for CO32-?
A.
Carbon trioxide
B.
Carbonate
C.
Carbon oxide
D.
Carbonite
Question #7
What is the correct formula for potassium hydroxide?
A.
KHSO4
B.
P(OH)3
C.
KOH
D.
K(OH)2
Question #8
What is the name for the ionic compound CrBr3?
A.
Chromium tribromide
B.
Chromium bromide
C.
Chromium(III) bromide
D.
Copper(III) bromide
Question #9
Which compound will yield an aqueous solution that conducts electricity?
A.
Na3PO4
B.
C2H6O
C.
N2O4
D.
SCl4
Question #10
What is the molecular formula for phosphine?
A.
NH3
B.
PH3
C.
N2H4
D.
P2H4
Question #11
What is the correct name for SCl4 ?
A.
Sulfur tetrachloride
B.
Selenium tetrachloride
C.
Disulfur heptachloride
D.
Sulfur chloride
Question #12
What is the proper name for C8H18?
A.
Benzene
B.
Nonane
C.
Decane
D.
Octane
Question #13
How many atoms of chlorine are in 0.50 mol CaCl2?
A.
3.0×1023 atoms
B.
6.0×1023 atoms
C.
2 atoms
D.
1.7×10-24 atoms
Question #14
Convert 4.45 mol of ruthenium to grams of ruthenium.
A.
449.76 g
B.
22.7 g
C.
0.0440 g
D.
450 g
Question #15
A typical serving of fresh apple pie contains 208 mg of sodium. How many moles of sodium are contained in this amount of fresh apple pie?
A.
4.78 × 103 mol sodium
B.
4.78 × 10-3 mol sodium
C.
9.05 mol sodium
D.
9.05 × 10-3 mol sodium
Question #16
Calculate the formula percent of oxygen in C6H8O4.
A.
50.0 %
B.
5.61 %
C.
44.4 %
D.
63.0 %
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