1) The rate limiting step in a reaction is the slowest step in the reaction sequence.
2) Ca(OH)2 is a strong base.
3) To separate racemic mixtures, the isomers must be in a chiral environment.
4) Boron trifluoride has three bonding domains, and its electron domain geometry is
trigonal planar.
5) Petroleum is a liquid composed of hundreds of compounds.
6) The half-life for a first order rate law depends on the starting concentration.
7) Electrons in core orbitals contribute to atom bonding.
8) The vaporization of a substance at its boiling point is an isothermal process.
9) The de Broglie wavelength of a particle is given by ________.
A) h + mv
B) hmv
C) h/mv
D) mv/c
E) mv
10) Which of the following will have an ideal van’t Hoff factor (i) value of 1?
A) sucrose
B) NaF
C) LiNO3
D) NH4NO3
E) Li2PO4
11) Proteins are biopolymers formed via multiple condensation coupling of which two
functional groups?
A) ester and amine
B) amine and carboxylic acid
C) alcohol and carboxylic acid
D) alcohol and amine
E) ester and carboxylic acid
12) Which one of the following is not a valid value for the magnetic quantum number
of an electron in a 5d subshell?
A) 2
B) 3
C) 0
D) 1
E) -1
13) Which of the following is not part of the kinetic-molecular theory?
A) Atoms are neither created nor destroyed by ordinary chemical reactions.
B) Attractive and repulsive forces between gas molecules are negligible.
C) Gases consist of molecules in continuous, random motion.
D) Collisions between gas molecules do not result in the loss of energy.
E) The volume occupied by all of the gas molecules in a container is negligible
compared to the volume of the container.
14) You have to calculate the mass of a 30.0 mL liquid sample with density of 1.52
g/mL, but you have forgotten the formula. Which way of reasoning would help you in
finding the correct mass?
A) If 1 mL of a liquid has the mass of 1.52 g, then 30.0 mL has the mass of __________
g.
B) If 1.52 mL of a liquid has the mass of 1 g, then 30.0 mL has the mass of __________
g.
15) The estimated costs for remodelling the interior of an apartment are: three 1-gallon
cans of paint at $15.44 each, two paint brushes at $12.22 each, and $145 for a helper.
The total estimated cost with the appropriate significant figures is $________.
A) 215.76
B) 2.2 X 102
C) 216
D) 2 X 102
E) 215.8
16) The combustion of ethylene proceeds by the reaction
C2H4 (g) + 3O2 (g) –> 2CO2 (g) + 2H2O (g)
When the rate of disappearance of O2 is 0.13 M s-1, the rate of appearance of CO2 is
________ M s-1.
A) 0.087
B) 0.043
C) 0.39
D) 0.20
E) 0.26
17) What is the formula for perchloric acid?
A) HClO
B) HClO3
C) HClO4
D) HClO2
E) HCl
18) Given the data in the table below, ΔH°rxn for the reaction
IF5 (g) + F2 (g) → IF7 (g)
is ________ kJ.
A) 1801
B) -1801
C) 121
D) -121
E) -101
19) The following reaction occurs in aqueous solution:
NH4
+ (aq) + NO2
––> N2 (g) + 2H2O (l)
The data below is obtained at 25 oC.
The order of the reaction in NH4
+ is ________.
A) -2
B) -1
C) +2
D) +1
E) 0
20) The ion PO4
3- has ________ valence electrons.
A) 14
B) 24
C) 27
D) 29
E) 32
21) How many significant figures are in the number 4001?
A) 3
B) 4
C) 5
D) 6
E) 7
22) Calculate the molality of a 24.4% (by mass) aqueous solution of phosphoric acid
(H3PO4).
A) 3.29 m
B) 323 m
C) 6.59 m
D) 1.65 m
E) The density of the solution is needed to solve the problem.
23) The more unpaired electrons in a species, the stronger is the force of magnetic
attraction. This is called ________.
24) The half-life for the beta decay of potassium-40 is 1.3 x 109 years. What is the rate
constant for this decay?
25) Given the equation:
C2H6 (g) + O2 (g) → CO2 (g) + H2O (g) (not balanced)
Determine the number of liters of CO2 formed at STP when 270.0 grams of C2H6 is
burned in excess oxygen gas.
26) Which one of the following is always positive when a spontaneous process occurs?
27) A catalyst that is present in a different phase from the reacting molecules is called
a(n) ________ catalyst.