1) Oxalic acid is a diprotic acid. Calculate the percent of oxalic acid (H2C2O4) in a
solid given that a 0.7984-g sample of that solid required 37.98 mL of 0.2283 M NaOH
for neutralization.
A) 48.89
B) 97.78
C) 28.59
D) 1.086
E) 22.83
2) Which group 3A element is a metalloid?
A) B
B) Al
C) Ga
D) In
E) Tl
3) How many moles of B are present at 10 s?
A) 0.011
B) 0.220
C) 0.110
D) 0.014
E) 1.4 x 10-3
4) Electromagnetic radiation with a wavelength of 641 nm appears as orange light to
the human eye. The energy of one photon of this light is 3.10 X 10-19 J. Thus, a laser
that emits 1.3 X 10-2 J of energy in a pulse of light at this wavelength produces
________ photons in each pulse.
A) 2.4 X 10-17
B) 6.3 X 10-24
C) 2.7 X 1019
D) 4.2 X 1016
E) 6.5 X 1013
5) Which group in the periodic table contains elements with the valence electron
configuration of ns2np1?
A) 1A
B) 2A
C) 3A
D) 4A
E) 8A
6) Of the following processes, which one changes the atomic number?
A) alpha emission
B) beta emission
C) electron capture
D) positron emission
E) All of these processes change the atomic numbers.
7) Barium reacts with a polyatomic ion to form a compound with the general formula
Ba3(X)2. What would be the most likely formula for the compound formed between
sodium and the polyatomic ion X?
A) NaX
B) Na2X
C) Na2X2
D) Na3X
E) Na3X2
8) A concise verbal statement or mathematical equation that summarizes a broad variety
of observations and experiences is called a(n) ________.
A) law
B) theory
C) hypothesis
D) experiment
E) test
9) Which of the following are weak acids?
A) HF, HBr
B) HI, HNO3, HBr
C) HI, HF
D) HF
E) none of the above
10) For which of the following can the composition vary?
A) pure substance
B) element
C) both homogeneous and heterogeneous mixtures
D) homogeneous mixture
E) heterogeneous mixture
11) At STP, the ratio of the root-mean-square speed of CO2 to that of SO2 is ________.
A) 2.001
B) 2.119
C) 1.000
D) 1.207
E) 1.456
12) What is the electron configuration for the Fe2+ ion?
A) [Ar]4s03d6
B) [Ar]4s23d4
C) [Ar]4s03d8
D) [Ar]4s23d8
E) [Ar]4s63d2
13) A solution contains 15 ppm of benzene. The density of the solution is 1.00 g/mL.
This means that ________.
A) there are 15 mg of benzene in 1.0 g of this solution
B) 100 g of the solution contains 15 g of benzene
C) 1.0 g of the solution contains 15 x 10-6 g of benzene
D) 1.0 L of the solution contains 15 g of benzene
E) the solution is 15% by mass of benzene
14) S is negative for the reaction ________.
A) 2SO2 (g) + O2 (g) –> 2SO3 (g)
B) NH4Cl (s) –> NH3 (g) + HCl (g)
C) PbCl2 (s) –> Pb2+ (aq) + 2Cl– (aq)
D) 2C (s) + O2 (g) –> 2CO2 (g)
E) H2O (l) –> H2O (g)
15) Calculate the vapor pressure of a solution made by dissolving 109 grams of glucose
(molar mass = 180.2 g/mol) in 920.0 ml of water at 25 oC. The vapor pressure of pure
water at 25 oC is 23.76 mm Hg. Assume the density of the solution is 1.00 g/ml.
A) 0.278 mm Hg
B) 0.605 mm Hg
C) 22.98 mm Hg
D) 23.48 mm Hg
E) 23.76 mm Hg
16) Of the following, which is the weakest acid?
A) HPO3
–
B) H3PO4
C) H2PO4
–
D) HPO4
–
E) The acid strength of all of the above is the same.
17) The general formula of an ester is ________.
A)
B)
C)
D)
E)
18) When a system ________, ΔE is always negative.
A) absorbs heat and does work
B) gives off heat and does work
C) absorbs heat and has work done on it
D) gives off heat and has work done on it
E) None of the above is always negative.
19) The octane number of straight-run gasoline is about ________.
A) 0
B) 25
C) 50
D) 75
E) 93
20) The symbol for the element phosphorus is ________.
A) Pt
B) K
C) P
D) S
E) Ca