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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. 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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2. 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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3. 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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4. In the following reaction, the initial rate of appearance of CO2 is measured to be 3.0×10−2 mol dm−3 s−1, what is the rate of disappearance of O2

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5. The following graph represents the change of concentration of a gaseous reactant and gaseous product during a reaction. At t=10 mins, the temperature is increased and at t=15 mins, the volume of the reaction vessel is increased.

7.1-81

Which row of the table below correctly describes the enthalpy change of the forward reaction and the moles of gas of the reactants and products?

  • Enthalpy change of forward reaction Moles of gas
    A. Exothermic Reactants more than the products
    B. Exothermic Reactants less than the products
    C. Endothermic  Reactants more than the products
    D. Endothermic Reactants less than the products

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6. What set of descriptions is correct about the following energy level diagram?

16.1-192

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7. 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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8. Which conditions would increase the equilibrium yield of H?

CH4 (g)+H2O (g) ⇋CO (g)+3 H2 (g)  ΔH=+210 kJ

  • I. Increase the volume of the reaction vessel
  • II. Increase the temperature
  • III. Use a catalyst

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9. 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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10. Which statements about the equilibrium constant for a reversible reaction are correct?

I. If Kc>>1, the products are favoured
II. If Kc<<1, the reactants are favoured III. If Kc=1, neither products nor reactants are favoured

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11. What cannot be used to determine the rate expression for a reaction?

 

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

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13. Sodium hydroxide and the ester ethyl acetate react with the rate equation: rate = k[Ester][NaOH].
What are the units of the frequency factor, , for this reaction? k=Ae−Ea/RT

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14. For a reaction that is first order with respect to [M], the rate of the reaction is 0.5 s−1 when the concentration of  is 1.0 mol dm−3. What would be the most likely rate when the concentration of  for the same reaction is 1.5 mol dm−3 ?

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15. 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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16. 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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17. The rate equation for the thermal decomposition of hydrogen peroxide is Rate=k[H2O2.
Which of the following graphs shows the relationship between the rate and the temperature of this reaction?

16.2-201

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18.

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19. 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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20.  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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21. 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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22. 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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23. Experimental data was collected for the following reaction.

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24. In the Arrhenius plot shown below, what is the correct labeling of the x and y axes, respectively?

CH0730

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25.

Temperature Pressure Color
A. Increases Increases Darker
B. Increases Decreases Paler
C. Decreases Increases Darker
D. Decreases Decreases Paler

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