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

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

 

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

16.1-192

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5. 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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6. 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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7.  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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8. 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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9. What is the reaction quotient of the following reaction, and in which direction will the reaction proceed?

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10.

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

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

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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.

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

 

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

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19. 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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20. 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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21. 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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22. 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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23. 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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24. 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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25.

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