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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.

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2.

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3. What do you call the maximum amount of product that would result from the complete consumption of the limiting reagent?

 

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4. 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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5. 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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6. In the Arrhenius plot shown below, what is the correct labeling of the x and y axes, respectively?

CH0730

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7. 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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8. 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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9.

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

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10. Which of the following reactions has the largest rate constant, k, under the same reaction conditions?

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11. Which statement(s) are correct for the below system at dynamic equilibrium?

KI (s) ⇋K+ (aq)+I−  (aq)

  • I. KI was initially added to the water in excess
  • II. No matter is exchanged with the surroundings
  • III. The rate of dissolution is equal to the rate of precipitation

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12.

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13. 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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14. 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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15. Nitrogen gas reacts with hydrogen gas to produce ammonia as per the following chemical equation:

N2(g)+3 H2(g)→2 NH3(g)

If 0.86  of N2 are mixed with 0.50 moles of H2, which reactant is in excess?

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16. 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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17. 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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18. 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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19. Experimental data was collected for the following reaction.

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20. Magnesium and excess hydrochloric acid react together to produce hydrogen gas. This experiment was conducted two times with different hydrochloric acid concentrations but with the same magnesium mass.
In both cases, the volume of hydrogen gas produced was measured at different times, and graphs 1 and 2 were plotted accordingly, as shown below. Choose the letter representing the stage where the rate of reaction is the fastest.

 

 

6.1-327

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21. 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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22. Which of the following statements about a system in equilibrium is incorrect?

 

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23. 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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24. 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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25. What cannot be used to determine the rate expression for a reaction?

 

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