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Factors affecting the rate of reaction

Edexcel IGCSE Chemistry

Topic questions The rate and extent of chemical change Factors affecting the rate of reaction

Factors affecting the rate of reaction

16 questions · 192 marks · about 3.5 hours

Factors affecting the rate of reaction questions

TopicFactors affecting the rate of reaction

Chemistry Paper 1 November 2024, Question 5 11 marks

Also involves Rate of reaction

Hydrogen peroxide decomposes to form water and oxygen.

This decomposition is shown in the equation.

(a)

Give the test for oxygen gas.

[1]

Reveal mark scheme

(b)

The rate of reaction is increased by adding a suitable catalyst.

Describe how a catalyst increases the rate of a reaction.

[2]

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(c)

A student uses this apparatus to investigate the rate of decomposition of hydrogen peroxide solution.

The student adds 100 cm³ of hydrogen peroxide solution at 20 °C to the apparatus labelled A.

The student records the volume of oxygen gas collected every minute for 16 minutes.

The graph shows the student’s results.

(c)(i)

Name the pieces of apparatus labelled A and B.

[2]

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(c)(ii)

Determine the volume of oxygen gas produced in the first 4 minutes.

Show on the graph how you obtain your answer.

[2]

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(c)(iii)

Determine the rate of reaction at 8 minutes by drawing a suitable tangent to the curve.

Include the units for the rate of reaction.

[4]

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Chemistry Paper 1 November 2024, Question 8 9 marks

Also involves Conservation of mass and balanced equations · Limiting reactants

A student uses this apparatus to investigate the rate of reaction between marble chips and dilute hydrochloric acid.

This is the equation for the reaction.

$Question 8, shown as an image$

(a)

Give a reason why the reading on the balance decreases during the reaction.

[1]

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(b)

Explain why the rate of reaction is greatest at the start.

[2]

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(c)

After 10 minutes, the reaction stops even though there are marble chips remaining.

Give a reason why the reaction stops.

[1]

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(d)

The student repeats the experiment with hydrochloric acid at a higher temperature to investigate the effect on the rate of reaction.

(d)(i)

Give two variables that should be controlled to make sure the results are valid.

[2]

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(d)(ii)

Explain the effect of increasing the temperature of hydrochloric acid on the rate of reaction.

[3]

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Chemistry Paper 1 June 2024 (R), Question 7 13 marks

Also involves Limiting reactants · Rate of reaction

A student uses this apparatus to investigate the rate of reaction between dilute sulfuric acid and an excess of small pieces of zinc.

This is the student’s method.

Step 1 use 50 cm³ of dilute sulfuric acid

Step 2 add approximately 5 g of small zinc pieces to the sulfuric acid

Step 3 quickly connect the gas syringe

Step 4 maths symbol record the reading on the gas syringe every 30 seconds until the reaction stops

(a)

(a)(i)

Name a suitable piece of apparatus to measure the volume of sulfuric acid.

[1]

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(a)(ii)

Give a reason why the mass of zinc pieces does not need to be measured accurately.

[1]

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(a)(iii)

Give a reason why the student quickly connects the gas syringe in step 3.

[1]

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(a)(iv)

State how the student would know when the reaction stops.

[1]

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(b)

The graph shows the volume of gas collected in the syringe during the experiment.

(b)(i)

A tangent to the curve has been drawn at a time of 80 s.

Use the tangent to calculate the rate of reaction at 80 s.

Show your working on the graph.

Give the unit.

[3]

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(b)(ii)

Explain the shape of the graph in these regions.

from 0 s to 60 s

from 60 s to 150 s

from 150 s to 240 s

[6]

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Chemistry Paper 2 June 2024 (R), Question 3 12 marks

Also involves Limiting reactants · Concentration of solutions

This question is about magnesium metal and its compounds.

(a)

(a)(i)

The diagram represents the structure of magnesium.

Complete the diagram by adding the labels.

[2]

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(a)(ii)

Explain why magnesium is malleable.

[2]

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(b)

Magnesium burns in oxygen gas to form solid magnesium oxide.

(b)(i)

Complete the chemical equation for the reaction by balancing the equation and adding the state symbols.

$Question 3, shown as an image$

[2]

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(b)(ii)

Give a reason why magnesium is oxidised in this reaction.

[1]

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(c)

A student uses this method to make a solution of magnesium chloride.

Step 1 measure 25 cm³ of dilute hydrochloric acid into a beaker

Step 2 add magnesium powder a little at a time

Step 3 keep adding magnesium powder until it is in excess

Step 4 remove the excess magnesium powder by filtration

This is the equation for the reaction.

$Question 3, shown as an image$

(c)(i)

Give a reason why the student uses magnesium powder rather than magnesium ribbon.

[1]

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(c)(ii)

Give a reason why the student adds an excess of magnesium in step 3.

[1]

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(c)(iii)

Calculate the minimum mass of magnesium needed to react with 25.0 cm³ of 2.00 mol / dm³ hydrochloric acid.

[for Mg, A_r = 24]

[3]

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Chemistry Paper 1 November 2023, Question 6 12 marks

A student uses this apparatus to investigate the decomposition of hydrogen peroxide solution.

This is the equation for the reaction.

(a)

Give the test for oxygen.

[1]

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(b)

Complete the dot‑and‑cross diagram for a molecule of hydrogen peroxide.

Show outer electrons only.

[2]

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(c)

H O O H

The student measures the volume of oxygen collected at regular intervals until the reaction stops.

The table shows the student’s results.

(c)(i)

Plot the student’s results on the grid.

[1]

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(c)(ii)

Draw a curve of best fit.

[1]

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(d)

(d)(i)

Explain in terms of particle collision theory how decreasing the concentration affects the rate of a reaction.

[3]

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(d)(ii)

The student repeats the experiment using the same volume of hydrogen peroxide solution but with half the original concentration.

All other conditions are kept the same.

On the grid, draw the curve you would expect the student to obtain.

[2]

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(e)

In this reaction, the manganese(IV) oxide acts as a catalyst.

Explain how a catalyst works.

[2]

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Chemistry Paper 2 June 2023, Question 6 6 marks

Ethanoic acid reacts with methanol to form an ester.

The equation shows the displayed formulae for the reactants and products.

$Question 6, shown as an image$

H H H H

(a)

(a)(i)

Give the name of a suitable catalyst to increase the rate of this reaction.

[1]

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(a)(ii)

State how you would know that an ester has formed.

[1]

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(a)(iii)

Give the name of this ester.

[1]

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(b)

The table shows the number of bonds in the reactants and the number of bonds in the products.

Bond	C H	C C	C O	C O	O H
Number of bonds in reactants	6	1	2	1	2
Number of bonds in products	6	1	2	1	2

(b)(i)

State which two bonds need to be broken in the reactants.

[1]

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(b)(ii)

Explain why the enthalpy change in this reaction is approximately 0 kJ / mol.

[2]

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Chemistry Paper 1 January 2023 (R), Question 4 13 marks

Also involves Chemical measurements and uncertainty

A student investigates the effect of temperature on the rate of reaction between two solutions, A and B. When the reaction occurs, the mixture turns from colourless to blue.

This is the student’s method.

• pour 25 cm³ of solution A into a conical flask

• add solution B and measure the temperature of the mixture

• record the time taken for the mixture to turn blue

The student repeats this method at different temperatures.

(a)

Give two variables that the student needs to keep constant in this investigation.

[2]

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(b)

The table shows the student’s results.

Temperature in °C	15	20	25	35	45	65
Time taken in seconds	178	156	132	130	122	113

(b)(i)

Plot the student’s results on the grid.

[1]

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(b)(ii)

Draw a circle around the anomalous result.

[1]

(b)(iii)

Draw a curve of best fit.

[1]

(b)(iv)

Give a reason for the anomalous result.

[1]

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(b)(v)

Use your graph to determine the time taken for the mixture to turn blue at 55 °C.

Show your working on the graph.

[2]

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(c)

Use information from the table to calculate the mean rate of reaction at 20 °C.

Use the expression

$Question 4, shown as an image$

Give your answer in standard form.

[2]

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(d)

Explain how increasing the temperature affects the rate of a reaction.

Refer to particle collision theory in your answer.

[3]

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Chemistry Paper 1 January 2023, Question 11 13 marks

Also involves Moles and amount of substance · Limiting reactants

This question is about the reaction between magnesium and dilute nitric acid.

(a)

A student reacts dilute nitric acid with an excess of magnesium powder as a first step in the preparation of dry crystals of hydrated magnesium nitrate.

This is the equation for the reaction.

$Question 11, shown as an image$

(a)(i)

Explain why it is important that magnesium is in excess.

[2]

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(a)(ii)

The student adds 0.75 g of magnesium to 0.025 mol of nitric acid.

Calculate the mass of magnesium, in grams, that remains at the end of the reaction.

[for magnesium, A_r = 24]

[3]

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(a)(iii)

Describe how the student can obtain dry crystals of hydrated magnesium nitrate from the mixture at the end of the reaction.

[5]

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(b)

The student repeats the experiment and records the volume of hydrogen gas collected.

The graph shows the student’s results.

Use the graph to calculate the rate of reaction, in cm³/ s, at t = 40 s.

Show your working on the graph.

[3]

Reveal mark scheme

Chemistry Paper 1 June 2022, Question 4 10 marks

Also involves Chemical measurements and uncertainty

A student uses the reaction between iron and oxygen to find the percentage of oxygen in air.

The diagram shows the apparatus the student uses.

(a)(i)

State why the iron powder needs to be wet.

[1]

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(a)(ii)

State the colour of the compound formed in the reaction between iron and oxygen.

[1]

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(a)(iii)

Give the formula of the compound formed.

[1]

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(a)(iv)

Explain the advantage of using iron powder rather than pieces of iron.

[2]

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(b)

The syringe in the diagram shows the reading at the end of the experiment.

Complete table 1 to show the readings on the syringe.

Give both values to the nearest 1 cm³.

[2]

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(c)

The student repeats the experiment and obtains a different set of results.

Table 2 shows these results.

Use the results from table 2 to calculate the percentage by volume of oxygen in the air.

[3]

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Chemistry Paper 1 June 2022, Question 6 15 marks

Also involves Moles and amount of substance · Limiting reactants

A student uses this apparatus to investigate the reaction between magnesium and dilute hydrochloric acid.

$Question 6, shown as an image$

(a)

The word equation for the reaction is

magnesium + hydrochloric acid maths symbol magnesium chloride + hydrogen

(a)(i)

Complete the chemical equation for this reaction.

$Question 6, shown as an image$

[1]

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(a)(ii)

Give the test for hydrogen.

[1]

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(a)(iii)

The student uses 0.090 g of magnesium and 0.025 mol of hydrochloric acid.

Show by calculation that the hydrochloric acid is in excess.

[2]

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(b)

The student measures the volume of hydrogen collected at regular intervals until the reaction stops.

The table shows the student’s results.

Time in s	0	15	30	45	60	75
Volume of hydrogen in cm³	0	40	68	80	88	88

(b)(i)

Plot the student’s results.

[1]

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(b)(ii)

Draw a curve of best fit.

[1]

(b)(iii)

Determine the volume of hydrogen collected in the first 10 seconds.

Show on the graph how you obtained your answer.

[2]

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(b)(iv)

Explain why the rate of reaction is greatest at the start of the reaction.

[2]

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(c)

The student repeats the experiment at a temperature 5 °C higher than the original temperature.

All other conditions are kept the same.

(c)(i)

On the grid, draw the curve you would expect the student to obtain.

[2]

Reveal mark scheme

(c)(ii)

Explain, in terms of particle collision theory, how increasing the temperature affects the rate of reaction.

[3]

Reveal mark scheme

Chemistry Paper 1 January 2022, Question 9 15 marks

Also involves Limiting reactants

A student uses this apparatus to investigate the rate of reaction between calcium carbonate chips and dilute hydrochloric acid.

$Question 9, shown as an image$

Every 20 seconds the student records the reading on the balance.

(a)

Explain why using a cotton wool plug increases the accuracy of the student’s results.

[2]

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(b)

Complete the equation for the reaction by adding the state symbols.

$Question 9, shown as an image$

[2]

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(c)

The student uses the balance readings to find the decrease in mass of the flask and contents.

The graph shows the student’s results.

(c)(i)

Give a reason why there are some calcium carbonate chips remaining in the flask when the reaction stops.

[1]

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(c)(ii)

State how the student would know when the reaction has stopped.

[1]

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(c)(iii)

Use the graph to determine the amount, in moles, of carbon dioxide produced during the reaction.

[M_r of CO₂ = 44]

[2]

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(c)(iv)

Use the graph to calculate the rate of reaction, in grams per second, at time 60 seconds.

Show your working on the graph.

[3]

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(d)

The student repeats the investigation by diluting the original hydrochloric acid.

The student then determines the initial rate of reaction at different percentage concentrations of the original hydrochloric acid.

The graph shows the student’s results.

(d)(i)

Describe the relationship between the initial rate of reaction and percentage concentration of the original hydrochloric acid.

[2]

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(d)(ii)

Explain why changing the concentration of hydrochloric acid has an effect on the initial rate of reaction.

[2]

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Chemistry Paper 1 January 2021 (R), Question 6 12 marks

Also involves Amounts of substance in equations

Zinc reacts with dilute hydrochloric acid to form hydrogen.

(a)(i)

Give a chemical equation for this reaction.

[2]

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(a)(ii)

Give a test for hydrogen gas.

[1]

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(b)

A student investigates the reaction between pieces of zinc and dilute hydrochloric acid.

In each experiment, he uses the same mass of zinc but a different volume of the acid.

He collects the hydrogen and measures its volume in each experiment.

The graph shows the student’s results.

Volume of dilute hydrochloric acid in cm³

(b)(i)

Use the graph to find the minimum volume of acid needed to react with all of the zinc.

[1]

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(b)(ii)

The student repeats the investigation, using hydrochloric acid of double the original concentration.

Determine the volume of hydrogen that would be collected using 15 cm³ of this acid.

Show your working on the graph.

$Question 6, shown as an image$

[2]

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(c)

Explain how increasing the concentration of the hydrochloric acid affects the rate of reaction.

[3]

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(d)

The rate of reaction could also be affected by changing the temperature of the hydrochloric acid, or by using a catalyst.

Explain one other way in which the rate of reaction between zinc and hydrochloric acid can be affected.

[3]

Reveal mark scheme

Chemistry Paper 2 January 2021, Question 3 8 marks

Also involves Chemical measurements and uncertainty

This question is about carboxylic acids.

Solutions of carboxylic acids react with magnesium metal to form hydrogen gas.

A student uses this apparatus to investigate the time taken to produce 10 cm³ of hydrogen gas from different carboxylic acids.

This is the student’s method.

maths symbol pour some carboxylic acid solution into a conical flask

maths symbol add some magnesium powder

maths symbol quickly connect the gas syringe and start a timer record the time taken to collect 10 cm³ of hydrogen gas

The student repeats the method with three other carboxylic acids.

(a)(i)

All the carboxylic acids are of the same concentration.

Give two other variables the student should control in his investigation.

[2]

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(a)(ii)

Give a reason why it is important to connect the gas syringe quickly.

[1]

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(b)

The table shows the student’s results.

Carboxylic	Formula of		Time taken to produce 10	cm³	of hydrogen in s
acid	carboxylic acid	Experiment 1	Experiment 2	Experiment 3	Experiment 4	Mean time in s
Methanoic acid	HCOOH	48	50	47	49	49
Ethanoic acid	CH₃COOH	61	63	60	61	61
Propanoic acid	CH₃CH₂COOH	69	93	70	71
Butanoic acid	CH₃CH₂CH₂COOH	83	85	82	81	83

(b)(i)

Calculate the mean (average) time for propanoic acid to produce 10 cm³ of hydrogen gas.

[2]

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(b)(ii)

Deduce the relationship between the number of carbon atoms in the molecule and the time taken to produce 10 cm³ of hydrogen gas.

[1]

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(c)

An ester is formed by adding ethanoic acid to ethanol in the presence of sulfuric acid.

Give the displayed formula of the ester produced when ethanoic acid reacts with ethanol.

[2]

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Chemistry Paper 1 November 2020 (R), Question 4 14 marks

Also involves Chemical measurements and uncertainty

A solution of hydrogen peroxide decomposes when a catalyst of manganese(IV) oxide is added.

The products of the reaction are water and oxygen.

(a)

Complete the chemical equation for this reaction.

$Question 4, shown as an image$

[1]

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(b)

Give a test for oxygen.

[1]

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(c)

State the reason for adding a catalyst.

[1]

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(d)

A student investigates how changing the concentration of the hydrogen peroxide solution affects the rate of this reaction.

She uses this apparatus.

The student records the volume of oxygen that collects every 2 minutes for 16 minutes.

The table shows her results.

(d)(i)

Plot the student’s results on the grid.

[1]

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(d)(ii)

Draw a circle on the grid around the anomalous result.

[1]

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(d)(iii)

Draw a curve of best fit through the points, ignoring the anomalous result.

[1]

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(d)(iv)

Suggest a mistake that the student might have made to cause the anomalous result.

[1]

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(d)(v)

Determine the volume of oxygen collected during the first 3 minutes.

Show on your graph how you obtain your answer.

$Question 4, shown as an image$

[2]

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(e)

The student repeats the experiment using hydrogen peroxide solution of half the concentration of the original solution.

She keeps the volume of the hydrogen peroxide solution and all other conditions the same.

(e)(i)

Draw on the grid the curve you would expect the student to obtain.

[2]

Reveal mark scheme

(e)(ii)

Explain how using hydrogen peroxide solution of half the concentration affects the rate of the reaction.

Refer to particle collision theory in your answer.

[3]

Reveal mark scheme

Chemistry Paper 1 November 2020, Question 7 14 marks

Also involves Chemical measurements and uncertainty

Dilute hydrochloric acid reacts with a solution of sodium thiosulfate (Na₂S₂O₃) to form a precipitate.

The equation for the reaction is

$Question 7, shown as an image$

(a)

State the name of the precipitate that forms.

[1]

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(b)

The reaction is often used to investigate rates of reaction.

The diagram shows the apparatus a student uses to investigate the effect of temperature on the rate of the reaction.

This is the student’s method.

● pour 50 cm³ of cold sodium thiosulfate solution into a conical flask and heat it to 20 maths symbol C

● draw a cross (X) on a piece of paper and place it under the flask

● add 5 cm³ of dilute hydrochloric acid to the flask

● look at the cross from above and record the time taken until the cross cannot be seen

The student repeats the experiment four times, using sodium thiosulfate solution at a different temperature each time.

He keeps the volumes of sodium thiosulfate solution and hydrochloric acid constant in each experiment.

Give two other factors that the student should keep constant.

[2]

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(c)

The table shows the student’s results.

Temperature in °C	Time until cross cannot be seen in s
20	400
30	188
40	84
50	44
60	24

The highest temperature the student uses is 60 maths symbol C because he thinks the results might not be as accurate at temperatures higher than 60C.

Suggest a reason why the results might not be as accurate at temperatures higher than 60 maths symbol C.

[1]

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(d)

The student wants to compare the rates of the reaction at the different temperatures.

He uses this formula to obtain a value for each rate of reaction

$Question 7, shown as an image$

The table shows the value of the rate of reaction at each temperature.

Temperature in °C	Time until cross cannot be seen in s	Rate of reaction in s^–1
20	400	0.0025
30	188	0.0053
40	84	0.012
50	44	0.023
60	24	0.042

Plot the values of temperature and rate of reaction on the grid.

Draw a curve of best fit through the points.

[2]

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(e)(i)

Use the graph to determine a value for the rate of the reaction at 45 maths symbol C.

Show on the graph how you obtained your answer.

[2]

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(e)(ii)

Calculate the time that it would take for the cross not to be seen at 45 maths symbol C.

[2]

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(e)(iii)

Describe the relationship between rate of reaction and temperature shown by the graph.

[1]

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(f)

Explain, in terms of particle collision theory, the effect that increasing the temperature has on the rate of a reaction.

[3]

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Chemistry Paper 2 January 2020 (R), Question 6 15 marks

This question is about ethane and ethene.

(a)

Ethane can be obtained from crude oil.

Describe the industrial process used to separate crude oil into fractions.

[4]

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(b)

The equation for the reaction between ethene gas and hydrogen gas is

$Question 6, shown as an image$

The rate of this reaction can be increased by increasing the pressure.

(b)(i)

Explain why increasing the pressure increases the rate of this reaction.

[2]

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(b)(ii)

The rate of this reaction can also be increased by using a catalyst.

Explain how using a catalyst increases the rate of a reaction.

[2]

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(b)(iii)

Give one other way that the rate of reaction between ethene gas and hydrogen gas can be increased.

[1]

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(b)(iv)

The reaction between ethene and hydrogen is exothermic.

Complete the reaction profile diagram, including labels for the activation energy and the enthalpy change, maths symbol H.

$Question 6, shown as an image$

[3]

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(c)

The reaction between ethene and hydrogen can be represented using displayed formulae.

H H H H

$Question 6, shown as an image$

Use the bond energies in the table to calculate the enthalpy change, maths symbol H, in kJ/mol for this reaction.

maths symbol H =_........ kJ/mol

[3]

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Factors affecting the rate of reaction

Factors affecting the rate of reaction questions

Edexcel 4CH1 Factors affecting the rate of reaction 16 questions

Chemistry Paper 1 November 2024, Question 5 Chemistry Paper 1 · November 2024 · Question 5 11 marks

Chemistry Paper 1 November 2024, Question 8 Chemistry Paper 1 · November 2024 · Question 8 9 marks

Chemistry Paper 1 June 2024 (R), Question 7 Chemistry Paper 1 · June 2024 (R) · Question 7 13 marks

Chemistry Paper 2 June 2024 (R), Question 3 Chemistry Paper 2 · June 2024 (R) · Question 3 12 marks

Chemistry Paper 1 November 2023, Question 6 Chemistry Paper 1 · November 2023 · Question 6 12 marks

Chemistry Paper 2 June 2023, Question 6 Chemistry Paper 2 · June 2023 · Question 6 6 marks

Chemistry Paper 1 January 2023 (R), Question 4 Chemistry Paper 1 · January 2023 (R) · Question 4 13 marks

Chemistry Paper 1 January 2023, Question 11 Chemistry Paper 1 · January 2023 · Question 11 13 marks

Chemistry Paper 1 June 2022, Question 4 Chemistry Paper 1 · June 2022 · Question 4 10 marks

Chemistry Paper 1 June 2022, Question 6 Chemistry Paper 1 · June 2022 · Question 6 15 marks

Chemistry Paper 1 January 2022, Question 9 Chemistry Paper 1 · January 2022 · Question 9 15 marks

Chemistry Paper 1 January 2021 (R), Question 6 Chemistry Paper 1 · January 2021 (R) · Question 6 12 marks

Chemistry Paper 2 January 2021, Question 3 Chemistry Paper 2 · January 2021 · Question 3 8 marks

Chemistry Paper 1 November 2020 (R), Question 4 Chemistry Paper 1 · November 2020 (R) · Question 4 14 marks

Chemistry Paper 1 November 2020, Question 7 Chemistry Paper 1 · November 2020 · Question 7 14 marks

Chemistry Paper 2 January 2020 (R), Question 6 Chemistry Paper 2 · January 2020 (R) · Question 6 15 marks

Certified Chemistry memes. Peer-reviewed by nobody.

Chemistry Paper 1 November 2024, Question 5 11 marks

Chemistry Paper 1 November 2024, Question 8 9 marks

Chemistry Paper 1 June 2024 (R), Question 7 13 marks

Chemistry Paper 2 June 2024 (R), Question 3 12 marks

Chemistry Paper 1 November 2023, Question 6 12 marks

Chemistry Paper 2 June 2023, Question 6 6 marks

Chemistry Paper 1 January 2023 (R), Question 4 13 marks

Chemistry Paper 1 January 2023, Question 11 13 marks

Chemistry Paper 1 June 2022, Question 4 10 marks

Chemistry Paper 1 June 2022, Question 6 15 marks

Chemistry Paper 1 January 2022, Question 9 15 marks

Chemistry Paper 1 January 2021 (R), Question 6 12 marks

Chemistry Paper 2 January 2021, Question 3 8 marks

Chemistry Paper 1 November 2020 (R), Question 4 14 marks

Chemistry Paper 1 November 2020, Question 7 14 marks

Chemistry Paper 2 January 2020 (R), Question 6 15 marks