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1) Given the data in the table below, ΔH°rxn for the reaction
Ca(OH)2 + 2H3AsO4 → Ca(H2AsO4)2 + 2H2O
is ________ kJ.
A) -744.9
B) -4519
C) -4219
D) -130.4
E) -76.4
2) A ________ liquid crystal has the least order and is the most liquid-like.
A) nematic
B) smectic
C) cholesteric
D) smectic B
E) smectic C
3) The coordination number of platinum in complexes is always ________.
A) 4
B) 5
C) 2
D) 3
E) 6
4) The hybridizations of bromine in BrF5 and of arsenic in AsF5 are ________ and
________, respectively.
A) sp3, sp3d
B) sp3d, sp3d2
C) sp3d, sp3
D) sp3d2, sp3d
E) sp3d2, sp3d2
5) Express the temperature, 275.18 K, in degrees Celsius.
A) 548.33 °C
B) 274.17 °C
C) 2.03 °C
D) 120.88 °C
E) 22.78 °C
6) Which of the following could be added to a solution of acetic acid to prepare a
buffer?
A) sodium hydroxide
B) hydrochloric acid
C) nitric acid
D) more acetic acid
E) None of the above can be added to an acetic acid solution to prepare a buffer.
7) Alkenes always contain a ________.
A) C C bond
B) CC bond
C) C-C bond
D) C H bond
E) CH bond
8) Oxides of most nonmetals combine with water to form ________.
A) an acid
B) a base
C) water and a salt
D) water
E) hydrogen gas
9) How many moles of pyridine (C5H5N) are contained in 4.14 g of pyridine?
A) 0.0523
B) 327
C) 6.88 x 10-24
D) 2.49 x1024
E) 79.1
10) A 3.82-g sample of magnesium nitride is reacted with 7.73 g of water:
Mg3N2 + 3H2O → 2NH3 + 3MgO
The yield of MgO is 3.60 g. What is the percent yield in the reaction?
A) 94.5
B) 78.4
C) 46.6
D) 49.4
E) 99.9
11) The most common oxidation state of silicon is ________.
A) -4
B) +2
C) +6
D) -2
E) +4
12) A temperature of 55.0 °F is the same as ________ °C.
A) 12.8
B) 131.0
C) 32.0
D) 328.2
E) -218.2
