Hi! I'm very confused on these sorts pf questions in the kinetics topic.. what happens to the curve when there's a change in concentration and volume? How do I weight this sort of stuff up to get the final graph?

The student used 100 cm3

of a 1.0 mol dm–3 solution of hydrogen peroxide at 298 K and

measured the volume of oxygen collected.

Curve R, in each of Figures 1, 2 and 3, shows how the total volume of oxygen collected

changed with time under these conditions.

(a) Draw a curve on Figure 1 to show how the total volume of oxygen collected will

change with time if the experiment is repeated at 298 K using 100 cm3

of a

2.0 mol dm–3 solution of hydrogen peroxide.

(b) Draw a curve on Figure 2 to show how the total volume of oxygen collected will

change with time if the experiment is repeated at 298 K using 100 cm 3

of a

0.4 mol dm–3 solution of hydrogen peroxide.

The student used 100 cm3

of a 1.0 mol dm–3 solution of hydrogen peroxide at 298 K and

measured the volume of oxygen collected.

Curve R, in each of Figures 1, 2 and 3, shows how the total volume of oxygen collected

changed with time under these conditions.

(a) Draw a curve on Figure 1 to show how the total volume of oxygen collected will

change with time if the experiment is repeated at 298 K using 100 cm3

of a

2.0 mol dm–3 solution of hydrogen peroxide.

(b) Draw a curve on Figure 2 to show how the total volume of oxygen collected will

change with time if the experiment is repeated at 298 K using 100 cm 3

of a

0.4 mol dm–3 solution of hydrogen peroxide.

Original post by mitostudent

Hi! I'm very confused on these sorts pf questions in the kinetics topic.. what happens to the curve when there's a change in concentration and volume? How do I weight this sort of stuff up to get the final graph?

The student used 100 cm3

of a 1.0 mol dm–3 solution of hydrogen peroxide at 298 K and

measured the volume of oxygen collected.

Curve R, in each of Figures 1, 2 and 3, shows how the total volume of oxygen collected

changed with time under these conditions.

(a) Draw a curve on Figure 1 to show how the total volume of oxygen collected will

change with time if the experiment is repeated at 298 K using 100 cm3

of a

2.0 mol dm–3 solution of hydrogen peroxide.

(b) Draw a curve on Figure 2 to show how the total volume of oxygen collected will

change with time if the experiment is repeated at 298 K using 100 cm 3

of a

0.4 mol dm–3 solution of hydrogen peroxide.

The student used 100 cm3

of a 1.0 mol dm–3 solution of hydrogen peroxide at 298 K and

measured the volume of oxygen collected.

Curve R, in each of Figures 1, 2 and 3, shows how the total volume of oxygen collected

changed with time under these conditions.

(a) Draw a curve on Figure 1 to show how the total volume of oxygen collected will

change with time if the experiment is repeated at 298 K using 100 cm3

of a

2.0 mol dm–3 solution of hydrogen peroxide.

(b) Draw a curve on Figure 2 to show how the total volume of oxygen collected will

change with time if the experiment is repeated at 298 K using 100 cm 3

of a

0.4 mol dm–3 solution of hydrogen peroxide.

For (b), concentration was reduced by 60% (less reactant). Kept temperature and volume same. The gradient would be smaller, with smaller gas volume collected.

The question is asking, what would happen to the rate of reaction, if we change the number of moles of reactant.

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