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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.

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

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

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3. 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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4. 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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5. 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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6. For an iodine clock reaction, the following experimental data was collected with respect to one of the reactants, the iodide ion, I.

 Trial  Concentration of I− (mol dm^−3  Rate of reaction ()
1 0.2 0.40
2 0.1 0.19
3 0.3 0.61

 

What is the most likely order of the reaction with respect to iodide I^− ?

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7. 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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8. 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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9. Which of the following determines the frequency factor, A, in the Arrhenius equation?

 

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

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12. Which statement about the relationship between Gibbs free energy change and the equilibrium constant is correct?

 

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

CH0730

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16.

 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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17. 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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18. 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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19.  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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20. What is the reaction quotient of the following reaction, and in which direction will the reaction proceed?

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21. 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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22.

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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. 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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25. 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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