8/11/2019 C2 20d Predicting Reaction Rates.docx

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Predicting Reaction Rates

The apparatus opposite was used to study the effect of different factors

on the rate of the reaction between indigestion tablets and acid

1. The effect of changing concentration (1)

The number of bubbles produced in 30 seconds were

recorded

The temperature was varied by heating the acid to differenttemperature before the experiment

The results are shown in the sketch graph below

2. The effect of changing surface area

The number of bubbles produced in 30 seconds were recorded as before

The experiment was repeated using different concentrations of acid each time

The results are shown in the sketch graph below

3. The effect of temperature(1)

The time taken to collect 50 bubbles was recorded.

The indigestion tablet was broken into a different number of pieces each time

The results are shown in the sketch graph below

Temperature (C)

Numberofbubblesproducedin

30s

The experiment was carried out with acid with a 1M

concentration. Add a line to the diagram showing how you

would expect the results to change if the experiment was

repeated with 0.5M acid

How would you explain your choice of line?

Number of pieces the tablet was broken into

Timetakentocollect50bubbles

(s)

The experiment was carried out at 30C. Add a line to the

diagram showing how you would expect the results to

change if the experiment was repeated a50C.

How would you explain your choice of line?

Concentration of acid (M)

Numberofbubblesproducedin

30s

The experiment was carried out with a whole indigestion tablet.

Add a line to the diagram showing how you would expect the

results to change if the experiment was repeated with a tablet

broken into four pieces.

How would you explain your choice of line?

8/11/2019 C2 20d Predicting Reaction Rates.docx

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The apparatus opposite was used to study the reaction between

marble chips and acid

4. The effect of changing temperature (2)

The volume of gas produced was recorded every ten

seconds for two minutes

The results are shown in the sketch graph below

5. The effect of changing concentration (2)

The volume of gas produced in 2 minutes was recorded

The experiment was repeated several times, changing the mass of marble chips each time.

Time (s)

Volu

meofgasproduced

(cm3)

The experiment was carried out at 20C. Add a line to the

diagram showing how you would expect the results to change if

the experiment was repeated at 40C.

(HINT: why does the graph flatten out?)

How would you explain your choice of line?

Time (s)

Volumeofgasproduced

(cm3)

The experiment with acid of concentration 0.5M . Add a line to

the diagram showing how you would expect the results to

change if the experiment was repeated using 1.0M acid.

How would you explain your choice of line?

Worksheet C2 20d