Introduction to Orders

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© www.CHEMSHEETS.co.uk 14-Jul-12 Chemsheets A2 002 1) Consider this reaction: A + B + C → D The rate equation is: rate = k [B] [C] 2 Complete the table to show how changing the concentrations affects the rate. Initial rate (mol dm -3 s -1 ) Change in concentration of reagents Effect on rate New initial rate (mol dm -3 s -1 ) 2.5 [A] x 3 None 2.5 0.75 [B] x 4 12 [C] x 10 0.50 [D] x 5 0.25 [A] ÷ 4 2.8 [B] ÷ 10 3.5 [C] ÷ 3 0.80 [D] ÷ 2 10.3 [A] x 2, [B] x 2 6.5 [B] x 2, [C] x 3 12.5 [A] x 2, [B] ÷ 3 4.8 [B] x 3, [C] ÷ 2 12.5 [A] x 6, [B] ÷ 4, [C] x 2 2.9 [A] x 2, [B] x 10, [C] ÷ 1.5 15.5 [B] x 3, [C] x 10, [D] ÷ 10 2) Consider this reaction: P + Q → R T acts as catalyst The rate equation is: rate = k [P] 2 [T] Complete the table to show how changing the concentrations affects the rate. Initial rate (mol dm -3 s -1 ) Change in concentration of reagents Effect on rate New initial rate (mol dm -3 s -1 ) 6.0 [P] x 2 5.0 [Q] x 5 10.0 [R] x 3 0.80 [T] x 4 8.0 [P] ÷ 3 12.5 [Q] ÷ 2 60 [R] ÷ 5 50 [T] ÷ 10 12 [P] x 2, [Q] x 2 10 [P] x 2, [T] x 3 40 [Q] x 2, [T] ÷ 3 25 [R] x 3, [T] ÷ 2 10 [P] x 4, [Q] ÷ 2, [T] x 2 20 [P] x 2, [Q] x 10, [T] ÷ 1.5 30 [P] x 3, [Q] x 10, [T] ÷ 10 5 [P] ÷ 2, [Q] ÷ 2, [T] ÷ 3 12 [P] x 2, [Q] ÷ 10, [T] x 5 16 [P] ÷ 3, [Q] ÷ 2.5, [T] x 3 8 [P] x 2.5, [Q] ÷ 4, [T] ÷ 2

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Transcript of Introduction to Orders

  • www.CHEMSHEETS.co.uk 14-Jul-12 Chemsheets A2 002

    1) Consider this reaction: A + B + C D

    The rate equation is: rate = k [B] [C]2

    Complete the table to show how changing the concentrations affects the rate.

    Initial rate (mol dm

    -3 s

    -1)

    Change in concentration of reagents

    Effect on rate New initial rate (mol dm

    -3 s-1)

    2.5 [A] x 3 None 2.5

    0.75 [B] x 4

    12 [C] x 10

    0.50 [D] x 5

    0.25 [A] 4

    2.8 [B] 10

    3.5 [C] 3

    0.80 [D] 2

    10.3 [A] x 2, [B] x 2

    6.5 [B] x 2, [C] x 3

    12.5 [A] x 2, [B] 3

    4.8 [B] x 3, [C] 2

    12.5 [A] x 6, [B] 4, [C] x 2

    2.9 [A] x 2, [B] x 10, [C] 1.5

    15.5 [B] x 3, [C] x 10, [D] 10

    2) Consider this reaction: P + Q R T acts as catalyst

    The rate equation is: rate = k [P]2 [T]

    Complete the table to show how changing the concentrations affects the rate.

    Initial rate (mol dm

    -3 s

    -1)

    Change in concentration of reagents

    Effect on rate New initial rate (mol dm

    -3 s-1)

    6.0 [P] x 2

    5.0 [Q] x 5

    10.0 [R] x 3

    0.80 [T] x 4

    8.0 [P] 3

    12.5 [Q] 2

    60 [R] 5

    50 [T] 10

    12 [P] x 2, [Q] x 2

    10 [P] x 2, [T] x 3

    40 [Q] x 2, [T] 3

    25 [R] x 3, [T] 2

    10 [P] x 4, [Q] 2, [T] x 2

    20 [P] x 2, [Q] x 10, [T] 1.5

    30 [P] x 3, [Q] x 10, [T] 10

    5 [P] 2, [Q] 2, [T] 3

    12 [P] x 2, [Q] 10, [T] x 5

    16 [P] 3, [Q] 2.5, [T] x 3

    8 [P] x 2.5, [Q] 4, [T] 2


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