Chem R110 - Elementary Chemistry » Spring 2021 » Exam 2
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Question #1
Which subatomic particle is located outside the nucleus of the atom?
A.
neutron
B.
electron
C.
proton
Question #2
What is the formula of calcium nitrate?
A.
Ca3N2
B.
Ca(NO3)2
C.
Ca(NO2)3
D.
Ca(NO2)2
Question #3
What is the value of n when the empirical formula is C3H5 and the molecular mass is ?
A.
None of these
B.
10
C.
140
D.
0.02
E.
5
Question #4
Which of the following compounds is INSOLUBLE?
A.
potassium acetate
B.
magnesium bromide
C.
None of these
D.
aluminum sulfide
E.
lithium carbonate
Question #5
Which of the following is the formula for carbon tetrachloride?
A.
CCl
B.
CCl4
C.
CCl3
D.
CCl2
Question #6
The atomic mass unit is defined as:
A.
1/12 the mass of a carbon atom containing six protons and six neutrons.
B.
the mass of electrons found in a carbon atom containing six protons and neutrons.
C.
the mass of the hydrogen atom containing only one proton.
D.
None of these
E.
1/14 the mass of a nitrogen atom containing 7 protons and 7 neutrons.
Question #7
Which is a spectator ion from the following complete ionic equation: H+(aq) + Br-(aq) + K+ (aq) + OH-(aq) → H2O(l) + K+(aq) + Br- (aq)
A.
H+
B.
None of these
C.
K+
D.
OH-
E.
H2O
Question #8
How many protons are in a neutral atom of Ar-40?
A.
18
B.
58
C.
22
D.
40
Question #9
What is the percent by mass of hydrogen in HC2H3O2?
A.
53.30%
B.
6.73%
C.
5.05%
D.
1.68%
Question #10
When the equation __Ca3N2 + __H2O → __Ca(OH)2 + __NH3 is balanced, the coefficient of H2O is:
A.
12
B.
None of these
C.
3
D.
2
E.
6
Question #11
Ions can be formed from atoms by losing or gaining electrons. Select the alternative that states the correct number of protons, neutrons, and electrons in .
A.
13 protons, 27 neutrons, 10 electrons
B.
10 protons, 17 neutrons, 13 electrons
C.
13 protons, 14 neutrons, and 16 electrons
D.
13 protons, 14 neutrons, and 10 electrons
Question #12
Which of the following exist in its natural state as a diatomic?
A.
radium
B.
boron
C.
iodine
D.
helium
Question #13
As the distance between two particles with charges that repel each other increases, the force of repulsion will ___.
A.
remain the same
B.
increase
C.
decrease
Question #14
When an atom gains an electron, the resulting particle is called:
A.
a cation.
B.
an isotope.
C.
an anion.
D.
None of these
E.
a proton.
Question #15
How many moles of magnesium ions are present in 1.64 g of MgSO4?
A.
120. mol
B.
0.0136 mol
C.
1.64 mol
D.
0.734 mol
Question #16
A fictional element has two isotopes and an atomic mass of 87.08 amu. If the first isotope is 86 amu and the second isotope has a mass of 90 amu. Which isotope has the greatest natural abundance?
A.
86 amu
B.
There are equal amounts.
C.
90 amu
D.
Not enough information provided.
E.
None of these
Question #17
What is the empirical formula of a substance that consists of 3.704g aluminum and 3.295g oxygen?
A.
Al3O2
B.
AlO2
C.
Al2O3
D.
AlO
Question #18
How many molecules are present in 0.500 mol of CH4?
A.
5.00 x 1022 molecules
B.
3.01 x 1023 molecules
C.
6.02 x 1023 molecules
D.
8.00 x 1023 molecules
Question #19
PbO2 is known as
A.
lead oxide.
B.
lead(IV) oxide.
C.
lead(II) oxide.
D.
lead dioxide.
Question #20
What is the molecular formula of a compound with the empirical formula CH2O and molar mass of 180.18g?
A.
CH2O
B.
C2H4O2
C.
C4H8O4
D.
C6H12O6
Question #21
H2S is called
A.
sulfuric acid.
B.
dihydrogen sulfuric acid.
C.
hydrosulfuric acid.
D.
hydrogen sulfite.
Question #22
The following reaction: C + O2 → CO2, is an example of
A.
combination.
B.
decomposition.
C.
single-displacement.
D.
double-displacement.
Question #23
What are the coefficients for the following reaction when it is properly balanced? ___nitric acid + ___sodium hydroxide → ___sodium nitrate + ___water
A.
1HNO3 + 2NaOH⟶ 1NaNO3+ 2H2O
B.
1HNO3 + 1NaOH⟶ 1NaNO3+ 1H2O
C.
2HNO3 + 1NaOH⟶ 2NaNO3+ 1H2O
D.
2HNO3 + 2NaOH⟶ 2NaNO3+ 2H2O
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