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1) ________-rays consist of fast-moving electrons.
A) Alpha
B) Beta
C) Gamma
D) X
E) none of the above
2) What radioactive element is used to diagnose medical conditions of the heart and
arteries?
A) cobalt-60
B) thallium-201
C) radium-226
D) radon-222
E) thorium-234
3) The principal reason for the extremely low solubility of NaCl in benzene (C6H6) is
the ________.
A) strong solvent-solvent interactions
B) hydrogen bonding in C6H6
C) strength of the covalent bond in NaCl
D) weak solvation of Na+ and Cl- by C6H6
E) increased disorder due to mixing of solute and solvent
4) All atoms of a given element have the same ________.
A) mass
B) number of protons
C) number of neutrons
D) number of electrons and neutrons
E) density
5) Which of the following would produce a basic solution?
A) CO and CO2
B) Na2O and MgO
C) Na2O, MgO, and BeH2
D) BeH2 only
E) CO, CO2, and BeH2
6) The pressure in a 12.2 L vessel that contains 2.34 g of carbon dioxide, 1.73 g of
sulfur dioxide, and 3.33 g of argon, all at 42 °C is ________ mm Hg.
A) 263
B) 134
C) 395
D) 116
E) 0.347
7) Calculate the pH of 0.726 M anilinium hydrochloride (C6H5NH3Cl) solution in
water, given that Kb for aniline is 3.83 x 10-4.
A) 1.78
B) 12.22
C) 5.36
D) 8.64
E) 12.42
8) Which one of the following is a source of carbon dioxide in the troposphere?
A) natural gas seepage
B) electrical discharges
C) fossil-fuel combustion
D) volcanic gases
E) forest fires
9) What is the mass % of aluminum in aluminum sulfide (Al2(SO4)3) rounded to three
significant figures?
A) 7.90
B) 23.7
C) 15.8
D) 31.6
E) 342.2
10) What is the empirical formula of a compound that contains 29% Na, 41% S, and
30% O by mass?
A) Na2S2O3
B) NaSO2
C) NaSO
D) NaSO3
E) Na2S2O6
11) The concentration (M) of an aqueous methanol produced when 0.200 L of a 2.00 M
solution was diluted to 0.800 L is ________.
A) 0.800
B) 0.200
C) 0.500
D) 0.400
E) 8.00
