Math
How many sulfur atoms are in 25.6 grams of Al2(S2O3)3?
2.37 e 10^23
The Lewis structure of AsCl3 has ____ single
bonds, ____ double bonds and ____ lone pairs.
3, 0, 10
The charge on the polyatomic ion MnO4 is...?
A. -1
B. -2
C. -3
D. +1
E. +2
A
In each pair, indicate which would be expected to
have the higher boiling point?
SF4 or SF6
NH3 or PH3
SF4 and NH3
The H-C-C angle in C2H4 is _____
120 degrees
7.53 x 10^23 molecules of an elements has a mass of 88.64 grams. What is the identity of this molecular element?
Cl2
Which of the following will have a Lewis structure
in which central atom must exceed the octet rule?
A. SF4
B. NO2+
C. CS2
D. ClF3
E. CF4
F. NO2-
SF4 and ClF4
What are the name of these two compounds:
N2O5 and Li3N?
dinitrogen pentoxide and lithium nitride
Place the following elements in increasing order
of electronegativity.
Al Cl Na Si
Na Al Si Cl
Which of the following solids would have the
highest melting point? Which the lowest?
A. NaI
B. MgCl2
C. NaF
D. MgO
Highest: MgO
Lowest: NaI
What is the combined mass percent composition of oxygen and nitrogen in CH4N2O?
73.3%
Arrange the diatomic molecules nitrogen (N2),
oxygen (O2) and bromine (Br2) in order of
increasing bond strength based on your knowledge
of the relative strengths of single, double and triple
bonds. (Hint: draw out the molecules.)
Br2 < O2 < N2
sodium carbonate
Arrange the bonds by increasing polarity:
S—S, S—Br, S—Cl.
S—S < S—Br < S—Cl
The electron pair geometry of XeF5+
molecule
is_________ and the molecular shape is _______.
octahedral, square pyramidal
Phenyl isocyanate is 11.8% by mass nitrogen.
What mass of nitrogen is contained in 175 mg of
phenyl isocyante?
20.7 mg
Which of the following is a polar molecule?
A. CS2
B. BCl3
C. NBr3
D. SiF4
E. PCl5
F. SF6
C. NBr3
What is the name of this polyatomic ion: ClO4-
perchlorate
Which molecule or compound below contains the
most non-polar covalent bond?
A. Li2CO3
B. F2
C. NaCl
D. SCl6
E. PF3
B
According to VSEPR Model, which one of the
following molecules has a tetrahedral molecular
geometry?
A. NH3
B. SO3
C. CCl4
D. CO2
E. HCN
F. SF4
CCl4
Caffeine has an elemental analysis of 49.48% C,
5.190% H, 16.47% O, and 28.85% N. It has a
molar mass of 194.19 g/mol. What is the molecular
formula of caffeine?
C8H10N4O2
Which of the following has the smallest bond
angle?
A. ammonia, NH3
B. methane, CH4
C. water, H2O
D. All three have the same bond angle.
C
What is the formula for the compound aluminum sulfide?
Al2S3
What is the approximate C—O bond order in the
carbonate ion, CO32-
1.33
What hybridization best describes the central atom
if it has the T-shaped molecular geometry?
sp3d