Chem 1010 - General Chemistry 1 » Summer 2021 » Problem Set I
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Question #1
An organic compound has an empirical formula of C2H3O and had an approximate molecular weight of 86. What is its molecular formula?
A.
C4H6O2
B.
C6H8O3
C.
C2H3O
D.
C10H14O5
E.
C8H12O4
Question #2
How many significant figures are present in each of the following: 86.9, 3.710, and 0.0492?
A.
three, four, four
B.
three, three, four
C.
three, four, five
D.
three, four, three
E.
three, three, three
Question #3
Which compound is incorrectly named?
A.
CaO calcium oxide
B.
MgBr2 magnesium bromide
C.
NaF sodium fluoride
D.
TiCl4 titanium tetrachloride
E.
CuO copper(II) oxide
Question #4
Which of the following is not an ionic compound?
A.
MgCl2
B.
NF3
C.
CaO
D.
NaOH
E.
NaF
Question #5
Which element can be classified as a noble gas?
A.
Ne
B.
No
C.
Cl
D.
P
E.
S
Question #6
What is the volume of 84.9 g of nickel? (Density of nickel = 8.90 g/mL)
A.
9.54 mL
B.
76.0 mL
C.
0.105 mL
D.
8.54 mL
E.
756 mL
Question #7
What is the mass of 0.311 moles of potassium iodate (KIO3)?
A.
1.45 × 10-3 g
B.
66.6 g
C.
688 g
D.
1.50 × 10-2 g
E.
214 g
Question #8
There are _____________ milligrams in a nanogram.
A.
1 × 10-6
B.
1 × 10-9
C.
1 × 106
D.
1 × 10-8
Question #9
A statement that includes a measurement or number is a:
A.
law.
B.
quantitative statement.
C.
qualitative statement.
D.
model.
E.
hypothesis.
Question #10
How many atoms are in a diatomic molecule?
A.
four
B.
one
C.
two
D.
three
Question #11
Color of a matter is considered as a _____________ property.
A.
chemical
B.
physical
Question #12
Mass of an unknown sample is 0.1265 kg. if its volume is 6.60 cm3. What would be the identity of an unknown sample?
A.
mercury (density = 13.6 g/cm3)
B.
silver (density = 10.5 g/cm3)
C.
iron (density = 7.86 g/cm3)
D.
gold (density = 19.2 g/cm3)
E.
Titanium (density = 0.0187 g/cm3)
Question #13
Find the correct combination of protons and electrons below for the magnesium ion.
A.
12 protons and 14 electrons
B.
12 protons and 12 electrons
C.
24 protons and 24 electrons
D.
24 protons and 22 electrons
E.
None of these choices
Question #14
What is the correct representation for an element that contains 26 protons, 26 electrons and 30 neutrons?
A.
52Te.
B.
56Zn.
C.
82Te.
D.
52Zn.
E.
56Fe.
Question #15
How many atoms are in a 10.0 g sample of titanium (Ti)?
A.
1.16 × 1027
B.
1.26 × 1023
C.
5.06 × 1026
D.
2.86 × 1023
E.
2.20 × 1023
Question #16
A sample of gallium contains two isotopes and its atomic weight is 69.72 amu. If the sample is composed of 60.10% 69Ga (68.926 amu), what is the identity and atomic weight of the other isotope?
A.
70Ga (70.92 amu)
B.
71Ga (70.92 amu)
C.
70Ga (70.51 amu)
D.
70Ga (70.25 amu)
E.
71Ga (70.25 amu)
Question #17
A combustion reaction produces 49.4 g of CO2. Determine the number of moles of carbon dioxide present.
A.
0.891 moles
B.
1.78 moles
C.
0.882 moles
D.
1090 moles
E.
1.12 moles
Question #18
Carbon dioxide is always composed of three parts by weight of carbon and eight parts by weight of oxygen. This is an example of:
A.
Dalton's Atomic Theory.
B.
The Law of Multiple Proportion.
C.
The Law of Conservation of Mass.
D.
The Law of Constant Composition.
E.
The Law of Conservation of Energy.
Question #19
All of the following properties of a substance can aid in its identification except:
A.
density.
B.
temperature.
C.
boiling point.
D.
reactivity.
E.
melting point.
Question #20
Which of the following is not the symbol of an element?
A.
CO
B.
Cr
C.
Ca
D.
C
E.
Cd
Question #21
According to the Kinetic Molecular Theory, as the temperature of a compound increases:
A.
its molecular motion increases
B.
its molecular motion increases, it freezes, its melting point increases and its boiling point increases
C.
its boiling point increases
D.
its melting point increases
E.
it freezes
Question #22
An organic compound contains 60.0% carbon, 4.44% hydrogen and the remainder oxygen. It has a molecular weight of 180. Determine the empirical formula of the compound.
A.
C6H12O6
B.
C9H8O4
C.
C2H2O
D.
C11H16O
E.
C10H12O3
Question #23
A compound is composed of 56.4% phosphorus and the remainder oxygen. Determine the empirical formula of the compound.
A.
PO5
B.
P2O3
C.
P3O2
D.
P2O5
E.
P2O
Question #24
Determine the number of molecules in a drop of water that has a mass of 0.050 g.
A.
1.67 × 1021 molecules
B.
2.17 × 1026 molecules
C.
5.42 × 1023 molecules
D.
5.02 × 1021 molecules
E.
6.50 × 1026 molecules
Question #25
Burning of hydrogen fuel is a(an) _____________ change.
A.
chemical
B.
conventional
C.
physical
Question #26
What is the proper answer and number of significant figures for the following calculation: (28.914 - 19.3) × 8.152?
A.
80
B.
78
C.
78.4
D.
78.37
E.
78.373
Question #27
The number of atoms of carbon is the same in which choice?
A.
0.500 moles CO and 0.250 moles of C2H6
B.
0.500 moles C2H6 and 0.250 moles C3H5O2
C.
0.500 moles C2H6 and 0.250 moles of CO2
D.
0.500 moles CO and 0.250 moles of CO2
E.
0.200 moles C2H6 and 0.333 moles C3H5O2
Question #28
Helium may be liquified at -452°F. Correctly estimating this temperature in Celsius yields:
A.
-484°C.
B.
-269°C.
C.
-219°C.
D.
-82°C.
E.
-871°C.
Question #29
Which statement is not true about a Ni sample that has 8.90g in 1 mL ?
A.
The density of a 2 mL sample would be the same as the 1 mL sample.
B.
The density of a 2 mL sample would be twice that of the 1 mL sample.
C.
The density of a 2 mL sample would be half that of the 1 mL sample.
D.
The density of a 17.80 g sample of nickel would be twice that of the 8.90 g sample.
E.
The density of a 4.45 g sample of nickel would be half that of the 8.90 g sample.
Question #30
How many of each types of atoms does the compound mercury acetate, Hg2(C2H3O2)2 contain?
A.
4 mercury, 4 carbon, 6 hydrogen, 4 oxygen
B.
2 mercury, 4 carbon, 6 hydrogen, 4 oxygen
C.
1 mercury, 2 carbon, 3 hydrogen, 2 oxygen
D.
2 mercury, 2 carbon, 3 hydrogen, 4 oxygen
E.
2 mercury, 2 carbon, 3 hydrogen, 2 oxygen
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