A2- Rate Equations Flashcards

1
Q

Draw the graph showing concentration-time for a 0 order reaction

A

straight line sloping downwards
x axis= time
y axis= concentration
https://cdn.savemyexams.co.uk/cdn-cgi/image/w=1920,f=auto/uploads/2021/01/5.6-Reaction-Kinetics-Zero-Order-Concentration.png

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2
Q

Draw the graph showing concentration-time for a 1st order reaction

A

curved line sloping down wards
(less steep than 2nd initially)
x axis= time
y axis= concentration

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3
Q

Draw the graph showing concentration-time for a 2nd order reaction

A

curved line sloping downwards
(more steep than 1st)
x axis= time
y axis= concentration

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4
Q

Draw the graph showing rate-concentration for a 0 order reaction

A

horizontal line
x axis= concentration
y axis= rate

https://cdn.savemyexams.co.uk/cdn-cgi/image/w=1920,f=auto/uploads/2021/01/5.6-Reaction-Kinetics-Zero-Order-Rate.png

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5
Q

Draw the graph showing rate-concentration for a 1st order reaction

A

straight line sloping upwards
x axis= concentration
y axis= rate

https://cdn.savemyexams.co.uk/cdn-cgi/image/w=1920,f=auto/uploads/2021/01/5.6-Reaction-Kinetics-First-Order-Rate.png

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6
Q

Draw the graph showing rate-concentration for a 2nd order reaction

A

curved line sloping up
gets steeper as concentration increases
x axis= concentration
y axis= rate

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7
Q

How do you work out the total order of a reaction?

A

add up the order of each reactant

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8
Q

If the reaction is 1st order with respect to reactant A, describe the relationship between rate and concentration of A

A

rate is directly proportional to [A]
(will change by same multiple)

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9
Q

If the reaction is 2nd order with respect to reactant A, describe the relationship between rate and concentration of A

A

rate is directly proportional to [A]^2
(will change by multiple^2)

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10
Q

If the reaction is 0 order with respect to reactant A, describe the relationship between rate and concentration of A

A

rate is directly proportional to [A]^0
(there would be no change)

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11
Q

How would you rearrange a rate equation to find k?

A

k= rate/[A]^x[B]^y

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12
Q

How would a conc-time graph show a reactant is first order?

A

if it has got a constant half life

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13
Q

What are the units for activation energy in the arrhenius equation?

A

give in kJ but need to be converted into J

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14
Q

What is the inverse version of the Arrhenius equation?

A

lnk = -Ea/R * 1/T - lnA

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15
Q

How would we work out the activation energy using a graph?

A

work out gradient (change in y/change in x)
m = -Ea/R
so m*R = -Ea

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16
Q

What is the significance of a zero order reactant in the mechanism of a reaction?

A

does not appear in the rate determining step

17
Q

How would you identify a catalyst?

A
  • reactant in step 1, product in the other
  • can be in the rate expression
  • will not be in overall equation
18
Q

How would you identify an intermediate?

A
  • product in 1st step, then used up as a reactant
  • cannot be in the rate equation
  • will not be in overall equation
19
Q

What is the arrhenius equation?

A

k = Ae^(-Ea/RT)

20
Q

How would a conc-time graph show a reactant is 0 order?

A

has a constant gradient