0%

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

1 / 25

1. 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

2 / 25

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

CH0730

3 / 25

3. Which of the following factors increases the rate of the reaction below?

Mg(s) + 2HNO3(aq) → Mg(NO)2(aq) + H2(g)

4 / 25

4. 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

5 / 25

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

 

6 / 25

6.

7 / 25

7. If the unit of rate constant, , for a reaction is mol−2 dm6 s−1, what is the overall order of the reaction?

8 / 25

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

9 / 25

9. 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)

10 / 25

10. 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?

11 / 25

11. 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

12 / 25

12. 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

13 / 25

13. 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

14 / 25

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

16.1-192

15 / 25

15. Which graph below represents a second-order reaction?

  • A.16-733a
  • B.16-733b
  • C.16-733c
  • D.16-733d

16 / 25

16.

17 / 25

17. What is the sum of the coefficients when the equation is balanced with whole numbers?

‾ C3H7OH(l)+‾ O2(g)→‾ CO2(g)+‾ H2O(l)

18 / 25

18.  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

19 / 25

19. 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

20 / 25

20. 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 ?

21 / 25

21.

 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

22 / 25

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

 

23 / 25

23. 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

24 / 25

24. 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

25 / 25

25. 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?

Your score is

0%