1) For a first-order reaction, a plot of ________ versus ________ is linear.
A) ln [A]t,
B) ln [A]t, t
C) , t
D) [A]t, t
E) t,
2) What mass (g) of AgBr is formed when 57.8 mL of 0.423 M AgNO3 is treated with
an excess of aqueous hydrobromic acid?
A) 4.59
B) 2.30
C) 25.7
D) 0.130
E) 25,700
3) The wavelength of an electron whose velocity is 1.7 X 104 m/s and whose mass is
9.1 X 10-28 g is ________ m.
A) 4.3 X 10-11
B) 12
C) 4.3 X 10-8
D) 2.3 X 107
E) 2.3 X 10-7
4) Which alkaline earth metal will not react with liquid water or with steam?
A) Be
B) Mg
C) Ca
D) Ba
E) They all react with liquid water and with steam.
5) Which one of the following is false concerning buckminsterfullerene?
A) It is the most recently discovered crystalline allotrope of carbon.
B) It consists of individual molecules like C60and C70.
C) It is a molecular form of carbon.
D) It is made up of Cl2 molecules.
E) It is made up of molecules that resemble soccer balls.
6) Calculate the value of ΔE in joules for a system that loses 115 J of heat and has 150 J
of work performed on it by the surroundings.
A) -115 J
B) -35 J
C) +35 J
D) +265 J
E) -265 J
7) The pH of a solution prepared by dissolving 0.350 mol of solid methylamine
hydrochloride (CH3NH3Cl) in 1.00 L of 1.10 M methylamine (CH3NH2) is ________.
The Kb for methylamine is
4.40 x 10-4. (Assume the final volume is 1.00 L.)
A) 1.66
B) 2.86
C) 10.28
D) 11.14
E) 10.61
8) The kinetic energy of a 10.3 g golf ball traveling at 48.0 m/s is ________ J.
A) 1.20 x 103
B) 66
C) 11.9
D) 1.3 x 102
E) 23.7
9) A 25.0 mL sample of a solution of a monoprotic acid is titrated with a 0.115 M
NaOH solution. The titration curve above was obtained. Which of the following
indicators would be best for this titration?
A) methyl red
B) bromthymol blue
C) thymol blue
D) phenolpthalein
E) bromocresol purple
10) How many neutrons are emitted when a californium-249 nucleus (Z=98) is
bombarded with a carbon-12 nucleus to produce a Rf nucleus?
A) one
B) three
C) two
D) four
E) zero
11) Expressing a number in scientific notation ________.
A) changes its value
B) removes ambiguity as to the significant figures
C) removes significant zeros
D) allows to increase the number’s precision
E) all of the above
12) A sample of CH2F2 with a mass of 19 g contains ________ atoms of F.
A) 2.2 x 1023
B) 38
C) 3.3 x 1024
D) 4.4 x1023
E) 9.5
13) Pure acetic acid (HC2H3O2) is a liquid and is known as glacial acetic acid.
Calculate the molarity of a solution prepared by dissolving 20.00 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) 2.52 x 103
B) 42.0
C) 0.0420
D) 0.699
E) 6.99 x 10-4
14) Which species below is the chromate ion?
A) Cr2O7
2-
B) CrO4
2-
C) CH3COO–
D) CO3
2-
E) None of the above
15) This reaction is an e x ample of ________.
Po –> Pb + _____
A) alpha decay
B) beta emission
C) gamma emission
D) positron emission
E) electron capture
16) A sample of an ideal gas (3.00 L) in a closed container at 25.0 °C and 76.0 torr is
heated to 270 °C. The pressure of the gas at this temperature is ________ torr.
A) 912
B) 138
C) 76.5
D) 39.5
E) 0.0253