Chem 1010 - General Chemistry 1 » Summer 2021 » Final Exam (C)
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Question #1
Choose the substance with the highest boiling point.
A.
CH4
B.
I2
C.
HF
D.
CS2
E.
KI
Question #2
Which of the following statements is FALSE?
A.
The rate of vaporization increases with increasing surface area.
B.
The rate of vaporization increases with increasing temperature.
C.
The rate of vaporization increases with decreasing strength of intermolecular forces.
D.
Molecules with hydrogen bonding are more volatile than compounds with dipole-dipole forces.
E.
None of the above are false.
Question #3
Which of the following contains an atom that does not obey the octet rule?
A.
ClF5
B.
CsI
C.
SnO2
D.
ClF
Question #4
In the best Lewis structure for NO +, what is the formal charge on the N atom?
A.
2
B.
0
C.
-1
D.
1
Question #5
A stock solution of HNO 3 is prepared and found to contain 13.5 M of HNO 3. If 25.0 mL of the stock solution is diluted to a final volume of 0.500 L, the concentration of the diluted solution is __________ M.
A.
270
B.
1.48
C.
0.675
D.
675
E.
0.27
Question #6
How many milliliters of 0.132 M HClO 4 solution are needed to neutralize 50.00 mL of 0.0789 M NaOH?
A.
0.0335
B.
0.012
C.
0.521
D.
29.9
E.
83.7
Question #7
Pure acetic acid (HC 2H 3O 2) is a liquid and is known as glacial acetic acid. Calculate the molarity of a solution prepared by dissolving 10.00 mL of glacial acetic acid at 25°C in sufficient water to give 500.0 mL of solution. The density of glacial acetic acid at 25°C is 1.05 g/mL.
A.
0.0210 M
B.
21.0 M
C.
0.350 M
D.
3.50 × 10-4 M
E.
1.26 × 103 M
Question #8
Using the VSEPR model, the molecular geometry of the central atom in XeF 2 is __________.
A.
trigonal planar
B.
linear
C.
trigonal pyramidal
D.
bent
E.
tetrahedral
Question #9
How many of the following molecules are polar? PCl 5 COS XeO 3 SeBr 2
A.
2
B.
4
C.
0
D.
1
E.
3
Question #10
To make a 0.500 M solution, one could take 0.500 moles of solute and add
A.
1.00 L of solvent.
B.
enough solvent to make 1.00 L of solution.
C.
1.00 kg of solvent.
D.
enough solvent to make 1.00 kg of solution.
Question #11
Calculate the freezing point of a solution of 40.0 g methyl salicylate, C 7H 6O 2, dissolved in 800. g of benzene, C 6H 6. Kf for benzeneis 5.100C/m and the freezing point is 5.50°C for benzene.
A.
3.41°C
B.
7.59°C
C.
2.09°C
D.
-2.09°C
Question #12
A solution is formed at room temperature by vigorously dissolving enough of the solid solute so that some solid remains at the bottom of the solution. Which statement below is TRUE?
A.
The solution is considered supersaturated.
B.
The solution is considered unsaturated.
C.
The solution would be considered unsaturated if it were cooled a bit to increase the solubility of the solid.
D.
The solution is considered saturated.
E.
None of the above are true.
Question #13
The pH of an aqueous solution at 25.0°C is 10.66. What is the molarity of H + in this solution?
A.
2.2 × 10-11
B.
1.1 × 10-13
C.
3.3
D.
4.6 × 1010
E.
4.6 × 10-4
Question #14
When dissolved in water, which compound is generally considered to be an Arrhenius acid?
A.
CH3CO2H
B.
CH3CH2OH
C.
Na2CO3
D.
NaOH
Question #15
Which of the following processes is endothermic?
A.
the vaporization of rubbing alcohol
B.
the combustion of propane
C.
a hot cup of coffee (system) cools on a countertop
D.
the freezing of water
E.
the chemical reaction in a "hot pack" often used to treat sore muscles
Question #16
Which of the following statements is TRUE?
A.
The more energy produced per kg of CO2 produced, the better the fuel.
B.
Cars that run on hydrogen fuel cells are environmentally friendly.
C.
Acid rain is one of the problems associated with the combustion of fossil fuels.
D.
The burning of fossil fuels contributes to global warming.
E.
All of the above are true.
Question #17
A piece of iron (C=0.449 J/g°C) and a piece of gold (C=0.128 J/g°C) have identical masses. If the iron has an initial temperature of 498 K and the gold has an initial temperature of 298 K, which of the following statements is TRUE of the outcome when the two metals are placed in contact with one another? Assume no heat is lost to the surroundings.
A.
Since the two metals have the same mass, the thermal energy contained in the iron and gold after reaching thermal equilibrium will be the same.
B.
Since the two metals have the same mass, the thermal energy contained in each metal after equilibrium will be the same.
C.
Since the two metals have the same mass, but the specific heat capacity of gold is much smaller than that of iron, the final temperature of the two metals will be closer to 298 K than to 498 K.
D.
Since the two metals have the same mass, the final temperature of the two metals will be 398 K, exactly halfway between the two initial temperatures.
E.
None of the above are true.
Question #18
Which of the following statements is TRUE?
A.
Once a theory is constructed, it is considered fact.
B.
A hypothesis is speculation that is difficult to test.
C.
A scientific law summarizes a series of related observations.
D.
An observation explains why nature does something.
E.
A scientific law is fact.
Question #19
A substance composed of two or more elements in a fixed, definite proportion is
A.
an alloy.
B.
a compound.
C.
a homogeneous mixture.
D.
a heterogeneous mixture.
E.
a solution.
Question #20
How many milliliters of ozone gas at at 25.0°C and 1.00 atm pressure are needed to react with 45.00 mL of a 0.100 M aqueous solution of KI according to the chemical equation shown below? O 3( g) + 2 I -( aq) + H 2O( l) → O 2( g) + I 2( s) + 2 OH -( aq)
A.
110. mL
B.
220. mL
C.
165 mL
D.
55.0 mL
Question #21
Which statement is TRUE about kinetic molecular theory?
A.
The collisions of particles with one another is completely elastic.
B.
The average kinetic energy of a particle is not proportional to the temperature.
C.
A single particle does not move in a straight line.
D.
The size of the particle is large compared to the volume.
Question #22
Calculate the atomic mass of element "X", if it has 2 naturally occurring isotopes with the following masses and natural abundances: X-45 44.8776 amu 32.88%, X-47 46.9443 amu 67.12%
A.
46.34 amu
B.
45.91 amu
C.
46.26 amu
D.
46.84 amu
E.
44.99 amu
Question #23
Which of the following statements is FALSE?
A.
Anions are usually larger than their corresponding atom.
B.
Nonmetals tend to gain electrons.
C.
The halogens tend to form 1+ ions.
D.
Atoms are usually larger than their corresponding cation.
E.
Metals tend to form cations.
Question #24
Which of the following occur as the energy of a photon increases?
A.
the wavelength gets shorter.
B.
the frequency decreases.
C.
the wavelength increases
D.
the speed increases.
E.
None of the above occur as the energy of a photon increases.
Question #25
Which of the following occur as the wavelength of a photon increases?
A.
Planck's constant decreases
B.
the speed decreases
C.
the frequency decreases
D.
the energy increases
E.
None of the above occur as the wavelength of a photon increases.
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