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HL - How Much, How Fast & How Far

25 MCQ from 2025 Question Bank How Much, How Fast & How Far (all topics)

DP IB HL Chemistry Quiz

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1. Which row of the table correctly states the changes that occur when the temperature is increased for the following reaction:

PbO2(s)⇌PbO(s)+1/2 O2(g)ΔH=+ve

  • Value of the equilibrium constant Position of equilibrium
    A. Changes Shifts towards the products
    B. Changes Shifts towards the reactants
    C. Stays the same Shifts towards the products
    D. Stays the same Shifts towards the reactants

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2. If the rate expression for a reaction 2 X+Y→Z is rate = k[X]2, which of the following is most likely to be correct?

 Rate determining step  Molecularity
 A. 2X + Y 3
 B. X + Y 1
 C. X + X 2
 D. XY + X 2

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3.

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4.  of each CH4,H2O, and CO are placed in a 1 dm3 container and allowed to equilibrate.
What is the equilibrium concentration of H2 and CO if there is  of H2O at equilibrium?

CH4(g)+H2O(g)⇌3H2(g)+CO(g)

  • [H2]/mol dm−3 [CO]/mol dm−3
    A. 0.5 0.5
    B. 1.5 0.5
    C. 0.5 1.5
    D. 1.5 1.5

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5. A reaction involving X and Y is measured and the following data is found:

Trial [X] (mol dm−3) [Y] (mol dm−3) Rate (s−1)
1 0.10 0.50 0.20
2 0.20 0.50 0.40
3 0.20 0.25 0.40

What possible mechanism is consistent with the data?

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6.

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7. Which of the following factors increases the rate of the reaction below?

Mg(s) + 2HNO3(aq) → Mg(NO)2(aq) + H2(g)

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8. Cesium-137 has a half-life of 30 years, and its decay is first order.

How long will it take for a 400 sample to be reduced to 25?

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9. Reaction 1 has a larger frequency factor, , than reaction 2 but a smaller activation energy, .
Which of the following graphs is correct?
lnk=−Ea/RT+lnA

16.2-205

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10.

 of SO3 is placed into a reaction vessel and allowed to reach equilibrium. Which row correctly represents the relative concentrations of SO2 and O2 at equilibrium?

2 SO3(g)⇌2 SO2(g)+O2(g)

  • [SO2] [O2]
    A. x 2x
    B. 2x x
    C. x x
    D. 4x x

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11. Which of the following are required to determine the equilibrium concentrations for a reversible reaction?

I. The equilibrium constant
II. The initial concentrations of reactants and products
III. The balanced equation and equilibrium expression

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12. Which of the following graphs would accurately represent a reaction with a rate expression rate = k [A]2

 
A. B.
CH0188A CH0188B
C. D.
CH0188C CH0188D

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13. If the unit of rate constant, , for a reaction is mol−2 dm6 s−1, what is the overall order of the reaction?

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14. The rate law for the reaction 2 NO(g)+O2(g)→2 NO2(g), is determined to be second-order with respect to N and first order with respect to O2.
Which of the mixtures below would create the fastest initial rate?

16-734

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15. Which graph below represents a second-order reaction?

  • A.16-733a
  • B.16-733b
  • C.16-733c
  • D.16-733d

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16. What effect would increasing the pressure have on the concentration of H2 and CO2 for the following reaction?

H2O(g)+CO(g)⇌H2(g)+CO2(g)

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17. What is the sum of the coefficients when the equation is balanced with whole numbers?

‾ C3H7OH(l)+‾ O2(g)→‾ CO2(g)+‾ H2O(l)

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18. When pentan-2-one undergoes complete combustion, carbon dioxide and water are the only products. The equation for this reaction is shown.

Pentan-2-one+a O2 →b CO2+b H2O

What are the values of a and b in this equation?

  •  a  b
    A. 7.0 5.0
    B. 7.5 5.0
    C. 8.0 6.0
    D. 8.5 6.0

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19. Which change does not affect the position of equilibrium?

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20.

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21. A 1 dm3 container contains 2 mol NH3,1 mol Nat equilibrium. What is the value of the equilibrium constant?

N2+3 H2⇌2 NH3

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22. What is the reaction quotient of the following reaction, and in which direction will the reaction proceed?

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23. When balanced, what is the sum of the correct coefficients for the following reaction?

__ LiOH (aq) + __ H2SO (aq) → __ Li2SO4(aq) + __HO (l)

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24. Two experiments were conducted, and the rates of reactions were measured. In the first experiment, 50 cm^3 of 0.010 mol dm^−3 of sulfuric acid was added to 0.200 g of zinc metal at 25∘∘C. In the second experiment, 50 cm^3 of 0.010 mol dm^−3 of sulfuric acid was added to 0.200 g of zinc metal at 25∘C, followed immediately by 100 cm^3 of distilled water. What happened to reaction rate in the second experiment, and why?

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25. Propane gas is combusted in oxygen gas according to the following equation:

C3H8(g)+5 O2(g)→3 CO2(g)+4 H2O(g)

When 11.0  of propane gas (MW 44.097) is combusted in 8.0 g of oxygen gas, 0.20  of water vapor is produced.
What is the excess reactant and how many moles remain after the reaction is complete?

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