Rate Equations

Question 1

What is the rate equation?

Answer 1

Rate = k[A]^m[B]ⁿ

Question 2

What do m and n tell you?

Answer 2

The orders of A and B, respectively.

Question 3

What is k, and in what case is it affected?

Answer 3

k is the rate constant which remains constant for a certain reaction.

It is affected when temperature is changed.

Question 4

How is the total order calculated?

Answer 4

By adding the individual orders together.

Question 5

What is the definition for the Reaction Rate?

Answer 5

The reaction rate is the change in the amount of reactants or products per unit time.

Question 6

How can you figure out the reaction rate from a concentration-time graph?

Answer 6

You measure the gradient ((y₂-y₁)/(x₂-x₁)).

Question 7

How can you use a concentration-time graph to deduce the order of reaction (via rate-conc.)

Answer 7

By plotting a rate-concentration graph by calculating the rate from several points on a concentration-time graph, then drawing a line of best fit through them.

0 order = horizontal line.

1^st order = straight line w/ gradient.

2^nd order = parabolic curve.

Question 8

If you increase a reactant’s concentration by x and the rate *?*, the order w.r.t that reactant is 0.

Answer 8

stays the same.

Question 9

If you increase a reactant’s concentration by x and the rate *?*, the order w.r.t that reactant is 1.

Answer 9

increases by x.

Question 10

If you increase a reactant’s concentration by x and the rate *?*, the order w.r.t that reactant is 2.

Answer 10

increases by x².

Question 11

What is the definition for Half-Life?

Answer 11

The half life (t_1/2) of a reaction is the time taken for half of the reactant to react.