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The initial rates for a reaction A and B were studied using the following initial concentrations in mol/L. Expt 1. [A]=0.300, [B]=0.400, rate=2.80x10-4 M/s Expt 2. [A]=1.04, [B]=0.400, rate=2.80x10-4 M/s Expt 3. [A]=0.695, [B]=1.63, rate=4.65x10-3 M/s What is the order of reaction with respect to B?

Select one:

a. 1

b. 0

c. insufficient information

d. 2

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Suppose the rate law for a reaction is rate = k[X]1[Y]2 and the rate of the reaction is 0.820 M/min when [X] = 0.697 M. All other factors being equal, if [X] = 1.96 M, the rate of the reaction would be

Select one:

a. 2.54 M/min

b. 2.31 M/min

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The concentration of reactant A was monitored over time and the following data were obtained: t=0, [A]=4.53x10-3 M t=292 s, [A]=2.26x10-3 M t=584 s, [A]=1.13x10-3 M Which of the following rate laws is consistent with the data?

Select one:

a. rate = (7.56x10-1 M-1 s-1) [A]2

b. rate = (2.37x10-3 s-1) [A]

c. rate = (7.56x10-1 s-1) [A]

d. rate = (2.37x10-3 M-1 s-1) [A]2

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The internuclear distance between atoms "A" and "B" in diatomic molecule AB is 1.36 Angstrom. If the molecule has a dipole moment of 3.23 Debye, calculate the percent ionic character.

Select one:

a. 56.8%

b. 55.7%

c. 49.4%

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In the following question, treat bonds between atoms with electronegativity difference less than 0.5 (on the Pauling scale) as nonpolar. The molecule H2S

Select one:

a. has no polar bonds and is nonpolar

b. has no polar bonds but is polar

c. has polar bonds and is polar

d. has polar bonds but is nonpolar

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What type of intermolecular forces is due to induced (temporary) dipole moments in molecules?

Select one:

a. Hydrogen bonding

b. London dispersion forces

c. Dipole-dipole interaction

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The structure of BeF2 can be considered as of the type AXmEn, where one central atom (A) is surrounded by m terminal atoms (X) and has n lone pairs. In this particular case, the central atom A...

Select one:

a. has an octet (which includes two lone pairs)

b. has an octet (which includes one lone pair)

c. has less than an octet (two pairs short)

d. has an octet with no lone pair

e. has less than an octet (one pair short)

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Which of the following are resonance structures?

Select one:

a. I and II only

b. I and III only

c. I, II, and III

d. II and III only

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A pure sample of liquid X has a normal boiling point of 63.5oC and a boiling point elevation constant of 4.93 oC mol-1 kg. When liquid X is mixed with nonvolatile solute particles, the boiling point of the resulting mixture was found to be 68.9oC. Calculate the molality of solute particles in the solution.

Select one:

a. 1.04 mol/kg

b. 1.10 mol/kg

c. 14.0 mol/kg

d. 12.9 mol/kg

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A solution is prepared by mixing 37.2 mL of 0.389 M potassium phosphate(aq) and 43.0 mL of 0.490 M potassium sulfate(aq), then adding enough water to bring the total volume to 200.0 mL. Calculate the molarity of K+ in the resulting solution.

Select one:

a. 4.28x10-1 M

b. 3.64x10-1 M

c. 2.75 M

d. 2.34 M

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A pure sample of liquid X has a normal freezing point of 11.9oC and a freezing point depression constant of 5.24 oC mol-1 kg. When 575 g of liquid X is mixed with 0.650 mol nonvolatile solute particles, the freezing point of the resulting mixture will be...

Select one:

a. 18.7 oC

b. 5.98 oC

c. 17.8 oC

d. 5.68 oC

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What is the molar concentration of sodium ions in a 0.330M NaNO3(aq) solution?

Select one:

a. 2.89 M Na+

b. 3.03 M Na+

c. 0.330 M Na+

d. 3.46x10-1 M Na+

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Which of the following salts yields an acidic solution in water?

Select one:

a. LiF

b. AlCl3

c. NaNO3

d. NaI

e. KBr

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An insoluble salt made up of M2+ and X- ions has a Ksp of 8.50x10-11. Calculate the solubility.

Select one:

a. 1.33x10-3 mol/L

b. 6.39x10-3 mol/L

c. 2.77x10-4 mol/L

d. 9.22x10-6 mol/L

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Which of the following is the conjugate acid of HCO3-?

Select one:

a. H3CO3+

b. CO32-

c. HCO32-

d. H2CO3

e. HCO3-

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The pH of a 9.05x10-2 M solution of B(aq) is 11.706. Calculate the Kb.

Select one:

a. 3.02x10-4

b. 2.85x10-4

c. 2.57x10-4

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Which of the following is a possible pH of a 2.99x10-3 M solution of B(aq) if B is a weak base?

Select one:

a. 11.476

b. 9.257

c. 2.524

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Predict if a precipitate of M2X would be formed in a solution that is 2.00x10-5M in M+ and 3.53x103M in X2-. The Ksp of M2X is 1.66x10-6.

Select one:

a. No, a precipitate will not be formed.

b. Yes, a precipitate will be formed.

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Which of the following describes the effect of removing products from a reaction mixture at equilibrium? (Q is the reaction quotient, Keq is the equilibrium constant)

Select one:

a. increase in Q; reaction shifts to the right until Q=Keq again

b. change in Keq; reaction shifts to the left or right until Q=Keq again

c. decrease in Q; reaction shifts to the right until Q=Keq again

d. increase in Q; reaction shifts to the left until Q=Keq again

e. decrease in Q; reaction shifts to the left until Q=Keq again

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Consider the reaction: A(g) + B(g) = 2C(g), Kc = 30.0. Suppose an 4.70-L mixture initially contains 3.56x10-3 mol A, 3.56x10-3 mol B, and no C. Calculate the equilibrium concentration of A.

Select one:

a. 2.13x10-4 mol/L

b. 1.11x10-3 mol/L

c. 2.03x10-4 mol/L

How are the equilibrium constants Kp and Kc related for the following reaction: 2 NO2(g) → 2 NO(g) + O2(g)

Select one:

a. Kc = (Kp)(RT)2

b. Kp = Kc

c. Kc = (Kp)(RT)

d. Kp = (Kc)(RT)

e. Kp = (Kc)(RT)2

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Consider the following fictitious reaction at equilibrium: A(g) + B(g) C(g) ΔH = -80 kJ Which of the following stresses would shift the equilibrium to the left?

Select one:

a. decreasing the volume by increasing the pressure at constant temperature

b. adding more A

c. adding more C

d. decreasing the temperature

e. adding a catalyst

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Given the following standard reduction potentials: Cu|Cu2+, 0.34 V Ag|Ag+, 0.80 V Based on the given information, under standard conditions, True or False: Cu2+ is a better reducing agent than Ag+.

Select one:

a. False

b. True

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State whether O is oxidized or reduced in nitric oxide → nitrogen dioxide

Select one:

a. neither

b. oxidized

c. reduced