Rate Of Reaction - Effect Of Concentration

4 Questions | Total Attempts: 67

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Rate Of Reaction - Effect Of Concentration

A quiz to assess your understanding.


Questions and Answers
  • 1. 
    Why does rate of reaction increase when concentration of reactant increases? 
    • A. 

      There are more particles.

    • B. 

      The volume is larger.

    • C. 

      The particles have more energy

    • D. 

      There are more particles per unit volume.

  • 2. 
    Graphs X and Y represent the results of 2 experiments demonstrating the catalytic decomposition of hydrogen peroxide. Assuming that all other conditions are kept constant, which one of the following is a correct explanation of the different results?
    • A. 

      50 cm3 of 1.0 mol/dm3 hydrogen peroxide were used in experiment X while 25 cm3 of 2.0 mol/dm3 of hydrogen peroxide were used in experiment Y

    • B. 

      1.0 g of catalyst was used in experiment X while 0.50 g of catalyst was used in experiment Y.

    • C. 

      Experiment X was carried out at 60 deg celsius while experiment Y was carried out at 30 deg celsius.

    • D. 

      50 cm3 of 1.0 mol/dm3 hydrogen peroxide was used in experiment X while 12.5 cm3 of 2.0 mol/dm3 were used in experiment Y.

  • 3. 
    Magnesium reacts with hydrochloric acid. Which solution would give the fastest initial rate of reaction given that the same volume of each acid is used?
    • A. 

      1 mol/dm3 of HCl

    • B. 

      2 mol/dm3 of citric acid, a tribasic acid

    • C. 

      1 mol/dm3 of H2SO4

    • D. 

      0.5 mol/dm3 of H2SO4

  • 4. 
    In the graph, curve (I) was obtained when 1 g of granulated zinc reacted with an excess of hydrochloric acid at 30 °C. Which of the following changes to this reaction would give curve (ii) ?
    • A. 

      Using 0.5 g of granulated zinc

    • B. 

      Using 1 g of finely powdered zinc

    • C. 

      Warming the acid to 40 °C.

    • D. 

      Adding water to dilute the acid