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1) The Ka for formic acid (HCO2H) is 1.8 x 10-4. What is the pH of a 0.20 M aqueous
solution of sodium formate (NaHCO2)?
A) 11.64
B) 5.48
C) 3.39
D) 8.52
E) 4.26
2) 30.0 grams of argon and 15.0 grams of xenon are placed in a 170.9 ml container at
21.8 °C. The partial pressure of xenon is ________ atm.
A) 16.1
B) 106
C) 1.20
D) 0.472
E) 228
3) Using Bohr's equation for the energy levels of the electron in the hydrogen atom,
determine the energy (J) of an electron in the n = 4 level.
A) -1.36 X 10-19
B) -5.45 X 10-19
C) -7.34 X 1018
D) -1.84 X 10-29
E) +1.84 X 10-29
4) Which of the following are chemical processes?
1. rusting of a nail
2. freezing of water
3. decomposition of water into hydrogen and oxygen gases
4. compression of oxygen gas
A) 2, 3, 4
B) 1, 3, 4
C) 1, 3
D) 1, 2
E) 1, 4
5) Consider a solution containing 0.100 M fluoride ions and 0.126 M hydrogen
fluoride. The concentration of fluoride ions after the addition of 9.00 mL of 0.0100 M
HCl to 25.0 mL of this solution is ________ M.
A) 0.0735
B) 0.0762
C) 0.0980
D) 0.0709
E) 0.00253
6) Magnesium and nitrogen react in a combination reaction to produce magnesium
nitride:
3 Mg + N2 → Mg3N2
In a particular experiment, a 8.33-g sample of N2 reacts completely. The mass of Mg
consumed is ________ g.
A) 7.23
B) 21.7
C) 28.9
D) 0.92
E) 13.9
7) This reaction is an e x ample of ________.
P --> Si + _____
A) alpha decay
B) beta decay
C) positron decay
D) electron capture
E) gamma emission
8) The thermodynamic quantity that expresses the extent of randomness in a system is
________.
A) enthalpy
B) internal energy
C) bond energy
D) entropy
E) heat flow
9) The hybrid orbital set used by the central atom in SO3 is ________.
A) sp
B) sp2
C) sp3
D) sp3d
E) sp3d2
10) The largest number of stable nuclei have an ________ number of protons and an
________ number of neutrons.
A) even, even
B) odd, odd
C) even, odd
D) odd, even
E) even, equal
11) is called a(n) ________.
A) amine
B) amide
C) ketone
D) aldehyde
E) ester
12) In acidic solution, ________.
A) [H3O+] > [OH-]
B) [H3O+] = [OH-]
C) [H3O+] < [OH-]
D) [OH-] > 7.00
E) [H3O+] = 0M
13) A real gas will behave most like an ideal gas under conditions of ________.
A) high temperature and high pressure
B) high temperature and low pressure
C) low temperature and high pressure
D) low temperature and low pressure
E) STP
14) The addition of hydrofluoric acid and ________ to water produces a buffer solution.
A) NaF
B) HF
C) NaNO3
D) NaBr
E) KI
15) Kb for NH3 is 1.8 x 10-5. What is the pOH of a 0.20 M aqueous solution of NH4Cl
at 25.0 oC?
A) 2.72
B) 11.28
C) 9.02
D) 4.98
E) 11.23
16) Which one of the following processes results in a decrease in the number of
neutrons?
A) alpha emission
B) gamma emission
C) positron emission
D) corrosion
E) electron capture
17) In what type of radioactive decay does the atomic number of the product increase
by one?
A) alpha
B) beta
C) gamma
D) positron emission
E) electron capture
