Chem 1021 Review
1. Which substance is undergoing oxidation in the following reaction?
K2Cr2O7(aq) + 14HI(aq)  2KI(aq) + 2CrI3(aq) + 3I2(s) + 7H2O(l)
a. K2Cr2O7
b. HI
c. KI
d. CrI3
e. I2
2. Determine the chemical formula for calcium carbonate.
a. Ca2C
b. Ca(C2H3O2)2
c. CaC
d. CaCO2
e. CaCO3
3. Write and balance the equation that represents the reaction of cyanogen, (CN)2, with F2(g) to produce carbon
tetrafluoride and nitrogen trifluoride. What coefficient is in front of the fluorine gas in the balanced reaction?
a. 1
b. 2
c. 3
d. 7
e. 14
4. How many oxygen atoms are present in 29.9 grams of Mg3(PO4)2? (MM of Mg3(PO4)2= 262.86 g/mol)
a. 6.85 x 1022 O atoms
b. 0.909 O atoms
c. 1.76 x 1023 O atoms
d. 5.29 x 1024 O atoms
e. 5.48 x 1023 O atoms
5. What volume (in mL) of 0.177 M CsI solution is required to react exactly with 34.9 mL of 0.118 M Cl2
solution according to the following reaction?
2CsI(aq) + Cl2(aq)  2CsCl(aq) + I2(aq)
a. 13.8 mL CsI
b. 46.5 mL CsI
c. 29.7 mL CsI
d. 17.5 mL CsI
e. 23.3 mL CsI
6. Determine the concentration of CO32- ions in solution after 35.0 mL of 0.155 M Mg(NO3)2 solution is reacted
with 58.0 mL of 0.0988 M Li2CO3 according to the reaction given.
Mg(NO3)2 (aq) + Li2CO3(aq)  MgCO3(s) + 2LiNO3(aq)
a. 6.16 x 10-2 M CO3
b. 3.28 x 10-3 M CO32c. 4.18 x 10-3 M CO321
Chem 1021 Review
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d. 5.26 x 10 M CO32e. 3.05 x 10-4 M CO321) HCl (3.00 mol) is combined with excess magnesium metal and reacts to completion. How many liters
of hydrogen gas, measured at 25oC and 1.00atm, are produced?
Mg(s) + 2HCl(aq)  MgCl2(aq) + H2(g)
2) The following graph contains data representing the molecular speed of O2 at 5 different temperatures:
500K, 1600K, 900K, 2300K, and 300K. Which temperature is represented by B?
3) An unknown substance (35.0g, preheated to 50oC) is placed into a coffee cup calorimeter containing
15.0g of water at 22oC. The calorimeter, without water, was calibrated to have a heat capacity of
10.0J/K. The final temperature of the entire apparatus is 30.0oC. What is the specific heat capacity of
the unknown substance?
4) You are given the
2A  B
H values for the reaction below:
H = -75.0 kJ
3A  C
H = -30.0 kJ
What is the
H for 3B  2C?
5) A system initially has an energy of 350 J. It undergoes a process in which 250J of heat energy is gained
and 400J of work is done. What is the final energy of the system?
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Chem 1021 Review
6) Given the reaction:
2Al(s) + Fe2O3(s)  2Fe(s) + Al2O3(s)
H = -850 kJ
What mass of iron is formed when 500 kJ of heat is released?
What is the energy released if 204g of Al2O3 is formed?
7) Suppose Ethenol, C2H3OH, is going to being used in a partial biofuel called E85*, which is 85% ethenol
in gasoline. Calculate the Horxn for the combustion of ethenol:
C2H5OH(l) + 3O2(g)  2CO2(g) + 3H2O(g)
Hof [C2H3OH (l)] = -322.7 kJ/mol
Hof [CO2(g)] = -393.5 kJ/mol
Hof [H2O(g)] = -241.8 kJ/mol
8) Draw the enthalpy diagram that best describes the following reaction (with enthalpy values relative to
the elements in their standard states):
CO(g) + CH3OH(l)  CH3COOH(l)
CO(g)
CH3OH(l)
CH3COOH(l)
Hof (kJ/mol)
-95.5
-310.9
-563.5
9) The infrared portion of the EM spectrum is between that of visible light and microwave radiation. Use
the wavelength data below to determine which of the answer choices lists a frequency of infrared
radiation.
Wavelength
550 nm
EM Range
Visible
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Chem 1021 Review
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2.1 x 10 m
microwave
10) Calculate the wavelength of the photon emitted when the hydrogen atom undergoes a transition from
n=4 to n=1.
1) What are the quantum numbers for the following orbital?
a. 4s
b. 2p
2) What is the electron configuration and orbital diagram for the following molecules?
a. K+
b. Cr
3) Rank the following in order of increasing atomic size, electronegativity, and ionization
a. Na, Mg, Rb
b. Te, O, Sb
4) Match the following enthalpies to the corresponding reaction
a. Electron affinity
1. NaCl  Na+(g) + Cl-(g)
b. Lattice energy
2. Na(s)  Na(g)
c. Heat of atomization
3. 2MgO(s)  2Mg(s) + ½ O2(g)
d. Ionization energy
4. O(g) + 2e
e. Heat of formation
5. Mg(g)  Mg2+(g) + 2e
5) Draw the Lewis structure for the following molecules
a. XeO2
b. H2SO4
 O-2(g)
c. NO3
6) What are the molecule shapes for the following molecules. Are they polar? What IMF would be present?
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Chem 1021 Review
a. ClF3
b. BrF5
c. NH3
7) Name the hybrid orbital of the carbons in the following molecule
8) Naming the following hydrocarbons
a. CH3CH2CH=CHCH3
b.
c.
9) Identifying the functional groups in the molecule
10) Calculate the Heat of Reaction when a substance it warms from 30 ͌C to 70 ͌C? The boiling point of the
substance is 55 ͌C. The cl = 35.5 J/mol, cg = 64 J/mol, and the ΔHvap = 4 kJ/mol.
11) If a substance has an initial pressure is 50kPa and temperature of 0 degrees and the pressure is increased
to 1000kPa. What type of phase change occurred?
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Chem 1021 Review
12) Are the following molecules isomers?
Br
a.
b.
c.
Cl
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