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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 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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2. 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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3. 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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4. 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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5. 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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6. 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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7. What is the reaction quotient of the following reaction, and in which direction will the reaction proceed?

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8. 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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9.

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10. 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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11.

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

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12. 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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13. Which change does not affect the position of equilibrium?

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14. The Maxwell-Boltzmann distribution plot below is for the same substance with the same concentration at different temperatures. Which statement is correct about the total number of molecules for each temperature?

 

 

6.1-326

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

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16.  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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17.

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

CH0730

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20. 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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21. Which of the following determines the frequency factor, A, in the Arrhenius equation?

 

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

 

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23. 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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24. 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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25. 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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