Dynamics (Kinetics)
Equilibrium
Electrochemistry and Redox
Descriptive Chemistry / Periodicity
Laboratory Chemistry
100
Which statement most accurately describes the behavior of a catalyst?
A) A catalyst increase the G of a reaction and hence the forward rate.
B) A catalyst reduces the H of a reaction and hence the temperature needed to produce products.
C) A catalyst reduces the activation energy for a reaction and increases the rate of a reaction.
D) A catalyst increase the equilibrium constant and final product concentrations.
C) A catalyst reduces the activation energy for a reaction and increases the rate of a reaction.
100
Consider this reaction.
P4(s) + 6Cl2(g) -> 4PCl3(g)
What is the correct Kc expression for this reaction?
A) Kc = 1/[Cl2]6
B) Kc = [PCl3]4/[P4][Cl2]6
C) Kc = [PCl3]4/[Cl2]6
D) Kc = [P4][Cl2]6/[PCl3]4
C) Kc = [PCl3]4/[Cl2]6
100
What is the oxidation number of chromium in Na2Cr2O7?
A) +12
B) +6
C) +3
D) -2
B) +6
100
Which of these elements has the smallest atomic radius?
A) fluorine
B) chlorine
C) bromine
D) iodine
A) fluorine
100
What is the correctly reported mass of water based on this data?
Mass of beaker and water 29.62 g
Mass of beaker only 28.3220 g
A) 1.3 g
B) 1.30 g
C) 1.298 g
D) 1.2980 g
B) 1.30 g
200
For the reaction of chlorine and nitric oxide,
2NO(g) + Cl2(g) ->2NOCl(g)
doubling the concentration of chlorine doubles the rate of reaction. Doubling the concentration of both reactants increase the rate of reaction by a factor of eight. The reaction is
A) first order in both NO and Cl2
B) first order in NO and second order in Cl2
C) second order in NO and first order in Cl2
D) second order in both NO and Cl2
C) second order in NO and first order in Cl2
200
Consider this reaction, carried out at constant volume,
2SO2(g) + O2(g) -> 2SO3(g) H= -198 kJ
The concentration of O2(g) at equilibrium increases if
A) SO2 is added to the system
B) SO3 is added to the system
C) the temperature of the system is lowered
D) an inert gas is added to the system
B) SO3 is added to the system
200
Which statement is true for this reaction?
Fe(s) + Cu2+(aq) -> Cu(s) + Fe2+(aq)
A) Cu2+ is oxidized
B) Cu2+ gains in oxidation number
C) Cu2+ is reduced
D) Fe is reduced
C) Cu2+ is reduced
200
Which of these atoms will be the smallest?
A) Si (Z=14)
B) P (Z=15)
C) Ge (Z=32)
D) As (Z=33)
B) P (Z=15)
200
To deliver a 25.00 mL liquid sample most precisely, which piece of glassware would you use?
A) volumetric flask
B) volumetric pipet
C) graduated cylinder
D) eye dropper
B) volumetric pipet
300
Under certain conditions, the average rate of appearance of oxygen gas in the reaction
2O3(g) -> 3O2(g)
is 1.2 x 10-3 atm/s. What is the average rate, expressed in atm/s, for the disappearance of O3?
A) 8.0 x 10-4
B) 1.2 x 10-3
C) 1.8 x 10-3
D) 5.3 x 10-3
A) 8.0 x 10-4
300
A 0.15 M solution of a weak acid is found to be 1.3% ionized. What is its Ka?
A) 1.3 x 10-2
B) 2.0 x 10-3
C) 1.1 x 10-3
D) 2.6 x 10-5
D) 2.6 x 10-5
300
Which statement is true for this reaction?
Zn(s) + CuSO4(aq) -> Cu(s) + ZnSO4(aq)
A) metallic zinc is the reducing agent
B) metallic zinc is reduced
C) copper ion is oxidized
D) sulfate ion is the oxidizing agent
A) metallic zinc is the reducing agent
300
What happens when a bromine atom becomes a bromide ion?
A) a positive ion is formed
B) the bromine nucleus acquires a negative charge
C) the bromide ion is larger than the bromine atom
D) the atomic number of bromine is decrease by one
C) the bromide ion is larger than the bromine atom
300
You have a beaker nearly full of gasoline on your laboratory table and it catches on fire. What should you do?
A) Pour water into the beaker
B) Throw it into the sink
C) Cover the beaker with a wet cloth
D) Blow out the flames
C) Cover the beaker with a wet cloth
400
Which function of [X], plotted against time, will give a straight line for a second order reaction?
A) [X]
B) [X]2
C) ln[X]
D) 1/[X]
D) 1/[X]
400
For the reaction
NH4Cl(s) -> NH3(g) + HCl(g)
H0= +176 kJ and G0= +91.2 kJ at 298 K. What is the value of G at 1000 K?
A) -109 kJ
B) -64 kJ
C) +64 kJ
D) +109 kJ
A) -109 kJ
400
Two metals are represented by the symbols L and Z. Which is the best oxidizing agent listed?
Standard Reduction Potentials
L2+(aq) +2e- -> L(s) +0.76 V
Z+(aq) + e- -> Z(s) +0.80 V
A) L
B) L2+
C) Z
D) Z+
D) Z+
400
An element forms a basic oxide with the formula XO and a hydride with the formula XH2. The hydride reacts with water to give hydrogen. The element X could be
A) K
B) Ca
C) N
D) O
B) Ca
400
A student determined the percent water in a sample. In four trials, values of 16.145%, 16.160%, 16.156%, and 17.279% were obtained for the percent water in a sample. What value should be used for the reported percent water?
A) 16.154%
B) 16.435%
C) 16.145%
D) 17.279%
A) 16.154%
500
The half-life for the first order conversion of cyclobutane to ethylene,
C4H8(g) -> 2C2H4(g)
is 22.7 s at a particular temperature. How many seconds are needed for the partial pressure of cyclobutane to decrease from 100 mmHg to 10 mmHg?
A) 52.0 s
B) 75.4 s
C) 90.0 s
D) 227 s
B) 75.4 s
500
Carbon monoxide gas reacts with hydrogen gas at elevated temperatures to form methanol according to this equation.
CO(g) + 2H2(g) 
CH3OH(g)
When 0.40 mol of CO and 0.30 mol of H2 are allowed to reach equilibrium in a 1.0 L container, 0.060 mol of CH3OH are formed. What is the value of Kc?
A) 0.50
B) 0.98
C) 1.7
D) 5.4
D) 5.4
500
When this oxidation-reduction equation is balanced in acidic solution, using only whole number coefficients, what is the coefficient for S(s)?
? C2O72-(aq) + ? H2S(aq) -> ? Cr3+(aq) + ? S(s)
A) 4
B) 3
C) 2
D) 1
B) 3
500
Which of these gases can be most efficiently collected by the displacement of water?
A) ammonia
B) nitrogen
C) carbon dioxide
D) hydrogen chloride
C) carbon dioxide
500
Free points to those who know my zodiac sign heheh
libra