18.3 rate-concentration graphs and initial rates

Question 1

what shape of the line is a zero order reaction on a rate-concentration graph?

Answer 1

a horizontal straight line with a zero gradient

Question 2

what is the shape of the line for a first order reaction on a rate-concentration graph?

Answer 2

produces a straight-line graph through the origin

Question 3

how do you work out the rate constant on a first order rate-concentration graph?

Answer 3

measuring the gradient of the line

Question 4

what is the shape of the line for a second order reaction on a rate-concentration graph?

Answer 4

produces an upward curve with increasing gradient

Question 5

how do you work out the rate constant of a second order reaction on a rate-concentration graph?

Answer 5

by plotting a second graph of rate against the concentration squared
the result is a straight line through the origin
the gradient of this line is equal to the rate constant