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1) Which of the following does not have eight valence electrons?
A) Ca+
B) Rb+
C) Xe
D) Br-
E) All of the above have eight valence electrons.
2) A solution containing 10.0 g of an unknown liquid and 90.0 g water has a freezing
point of -3.33 oC. Given Kf = 1.86 oC/m for water, the molar mass of the unknown
liquid is ________ g/mol.
A) 69.0
B) 333
C) 619
D) 161
E) 62.1
3) The molecular geometry consists of ________.
a) a nonbonding pair of electrons
b) a single bond
c) a multiple bond
A) a only
B) b only
C) c only
D) a, b, and c
E) b and c
4) An alkaline earth metal forms a compound with oxygen with the formula ________.
(The symbol M represents any one of the alkaline earth metals.)
A) MO
B) M2O
C) MO2
D) M2O2
E) MO3
5) The element phosphorus exists in two forms in nature called white phosphorus and
red phosphorus. These two forms are examples of ________.
A) isotopes
B) allotropes
C) oxidation
D) metalloids
E) noble gases
6) Which of the following has the same number of significant figures as the number
0.0050?
A) 0.9
B) 4.0
C) 1.00
D) 601
E) 99.000
7) Gases and liquids share the property of ________.
A) compressibility
B) definite volume
C) incompressibility
D) indefinite shape
E) definite shape
8) Write the balanced equation for the reaction that occurs when methanol, CH3OH (l),
is burned in air. What is the coefficient of oxygen in the balanced equation?
A) 1
B) 2
C) 3
D) 4
E) 3/2
9) The Ka of hypochlorous acid (HClO) is 3.0 x 10-8 at 25.0 oC. Calculate the pH of a
0.0385 M hypochlorous acid solution.
A) 3.05
B) 9.53
C) 4.47
D) 6.52
E) -3.05
10) Which element forms an ion with the same charge as the ammonium ion?
A) potassium
B) chlorine
C) calcium
D) oxygen
E) nitrogen
11) The substance with the largest heat of vaporization is ________.
A) I2
B) Br2
C) Cl2
D) F2
E) O2
12) The missing product from this reaction is ________.
I --> _____ + e
A) Te
B) X e
C) Te
D) e
E) none of the above
13) Of the following, ________ is a weak acid.
A) HF
B) HCl
C) HBr
D) HNO3
E) HClO4
