Home
GCSE
Chemistry
Edexcel
Percentage yield

Edexcel GCSE Chemistry

Topic questions Quantitative chemistry Percentage yield

Percentage yield

15 questions · 163 marks · about 3 hours

Percentage yield questions

TopicPercentage yield

Paper 1 June 2025 Foundation tier, Question 10, also on the Higher paper 11 marks

Phosphoric acid is important in the production of fertilisers.

(a)

(a)(i)

A few drops of litmus solution are added to a sample of dilute phosphoric acid.

What is the colour of the mixture formed?

$Question 10, shown as an image$

[1]

Reveal mark scheme

(a)(ii)

State why litmus cannot be used to measure pH.

[1]

Reveal mark scheme

(b)

Phosphoric acid can react to form phosphate salts which are used in fertilisers.

Give two reasons why farmers use fertilisers on their fields.

[2]

Reveal mark scheme

(c)

An experiment was carried out to produce phosphoric acid.

(c)(i)

The actual yield for the experiment was 18.62 g.

The theoretical yield for the experiment is 24.50 g.

$Question 10, shown as an image$

Calculate the percentage yield of this experiment.

percentage yield =_........

[2]

Reveal mark scheme

(c)(ii)

The equation for a reaction to make phosphoric acid, H₃PO₄, is

$Question 10, shown as an image$

Calculate the atom economy for the production of phosphoric acid in this reaction.

$Question 10, shown as an image$

(relative formula masses: Ca₅(PO₄)₃OH = 502, H₂SO₄ = 98, H₃PO₄ = 98, CaSO₄ = 136, H₂O = 18)

atom economy =_........ %

[3]

Reveal mark scheme

(c)(iii)

The equation for a reaction to produce phosphoric acid is

$Question 10, shown as an image$

Explain how the atom economy of the reaction can be increased.

[2]

Reveal mark scheme

Paper 1 June 2025 Higher tier, Question 4, also on the Foundation paper 11 marks

Also involves NPK fertilisers

Phosphoric acid is important in the production of fertilisers.

(a)

(a)(i)

A few drops of litmus solution are added to a sample of dilute phosphoric acid.

What is the colour of the mixture formed?

$Question 4, shown as an image$

[1]

Reveal mark scheme

(a)(ii)

State why litmus cannot be used to measure pH.

[1]

Reveal mark scheme

(b)

Phosphoric acid can react to form phosphate salts which are used in fertilisers.

Give two reasons why farmers use fertilisers on their fields.

[2]

Reveal mark scheme

(c)

An experiment was carried out to produce phosphoric acid.

(c)(i)

The actual yield for the experiment was 18.62 g.

The theoretical yield for the experiment is 24.50 g.

$Question 4, shown as an image$

Calculate the percentage yield of this experiment.

percentage yield =_........

[2]

Reveal mark scheme

(c)(ii)

The equation for a reaction to make phosphoric acid, H₃PO₄, is

$Question 4, shown as an image$

Calculate the atom economy for the production of phosphoric acid in this reaction.

$Question 4, shown as an image$

(relative formula masses: Ca₅(PO₄)₃OH = 502, H₂SO₄ = 98, H₃PO₄ = 98, CaSO₄ = 136, H₂O=18)

atom economy =_........

[3]

Reveal mark scheme

(c)(iii)

The equation for a reaction to produce phosphoric acid is

$Question 4, shown as an image$

Explain how the atom economy of the reaction can be increased.

[2]

Reveal mark scheme

Paper 1 June 2024 Foundation tier, Question 10 11 marks

(a)

Titanium can be extracted from titanium oxide, TiO₂, by reaction with magnesium.

(a)(i)

100 tonnes of titanium oxide was heated with magnesium. The titanium formed in the reaction was separated and purified. The mass of titanium was then determined.

The results are shown in Figure 16.

Use the information in Figure 16 to calculate the percentage yield of titanium in this process.

$Question 10, shown as an image$

Give your answer to 1 decimal place.

percentage yield =_........

[3]

Reveal mark scheme

(a)(ii)

Give two reasons why the percentage yield for this process is less than 100%.

[2]

Reveal mark scheme

(a)(iii)

The balanced equation for this process is

$Question 10, shown as an image$

Calculate the atom economy of this process to produce titanium.

$Question 10, shown as an image$

Give your answer to 2 significant figures.

(relative atomic masses: O = 16, Mg = 24, Ti = 48)

atom economy =_........

[3]

Reveal mark scheme

(b)

Ethanol, C₂H₅OH, can be produced by two different methods.

• by the hydration of ethene, C₂H₄

$Question 10, shown as an image$

• and by the fermentation of a carbohydrate, e.g. sucrose, C₁₂H₂₂O₁₁

$Question 10, shown as an image$

(b)(i)

State why the hydration of ethene has an atom economy of 100%.

[1]

Reveal mark scheme

(b)(ii)

Explain how the atom economy of the fermentation reaction can be improved.

[2]

Reveal mark scheme

Paper 1 June 2024 Higher tier, Question 4 11 marks

Also involves Producing ethanol

(a)

Titanium can be extracted from titanium oxide, TiO₂, by reaction with magnesium.

(a)(i)

100 tonnes of titanium oxide was heated with magnesium. The titanium formed in the reaction was separated and purified. The mass of titanium was then determined.

The results are shown in Figure 4.

Use the information in Figure 4 to calculate the percentage yield of titanium in this process.

$Question 4, shown as an image$

Give your answer to 1 decimal place.

percentage yield =_........

[3]

Reveal mark scheme

(a)(ii)

Give two reasons why the percentage yield for this process is less than 100%.

[2]

Reveal mark scheme

(a)(iii)

The balanced equation for this process is

$Question 4, shown as an image$

Calculate the atom economy of this process to produce titanium.

$Question 4, shown as an image$

Give your answer to 2 significant figures.

(relative atomic masses: O = 16, Mg = 24, Ti = 48)

atom economy =_........

[3]

Reveal mark scheme

(b)

Ethanol, C₂H₅OH, can be produced by two different methods.

• by the hydration of ethene, C₂H₄

$Question 4, shown as an image$

• and by the fermentation of a carbohydrate, e.g. sucrose, C₁₂H₂₂O₁₁

$Question 4, shown as an image$

(b)(i)

State why the hydration of ethene has an atom economy of 100%.

[1]

Reveal mark scheme

(b)(ii)

Explain how the atom economy of the fermentation reaction can be improved.

[2]

Reveal mark scheme

Paper 1 June 2023 Foundation tier, Question 10 11 marks

There are several stages to the production of sulfuric acid in industry.

(a)

Sulfur dioxide is required for the production of sulfuric acid.

Sulfur dioxide can be obtained by heating copper sulfide, Cu₂S, in excess air.

$Question 10, shown as an image$

Calculate the atom economy for the production of sulfur dioxide, SO₂, in this reaction.

(relative atomic mass: Cu = 63.5 relative formula masses: O₂ = 32.0, Cu₂S = 159.0, SO₂ = 64.0)

Give your answer to two significant figures.

[4]

Reveal mark scheme

(b)

In one stage vanadium oxide, V₂O₅, is used.

Based on the position of vanadium in the periodic table, which row shows the most likely melting point of vanadium and colour of vanadium oxide?

[1]

Reveal mark scheme

(c)

The equation shows a reaction forming sulfuric acid.

(c)(i)

Calculate the maximum mass of sulfuric acid that could be produced from 400 tonnes of sulfur trioxide, SO₃.

(relative formula masses: SO₃ = 80, H₂SO₄ = 98)

maximum mass of sulfuric acid =_........ tonnes

[2]

Reveal mark scheme

(c)(ii)

Using a different amount of sulfur trioxide, it was calculated that 700 tonnes of sulfuric acid could be made.

The actual mass produced was 672 tonnes.

Calculate the percentage yield of sulfuric acid.

[2]

Reveal mark scheme

(c)(iii)

[2]

Reveal mark scheme

Paper 1 June 2023 Higher tier, Question 4 11 marks

There are several stages to the production of sulfuric acid in industry.

(a)

Sulfur dioxide is required for the production of sulfuric acid.

Sulfur dioxide can be obtained by heating copper sulfide, Cu₂S, in excess air.

$Question 4, shown as an image$

Calculate the atom economy for the production of sulfur dioxide, SO₂, in this reaction.

(relative atomic mass: Cu = 63.5 relative formula masses: O₂ = 32.0, Cu₂S = 159.0, SO₂ = 64.0)

Give your answer to two significant figures.

atom economy =_........

[4]

Reveal mark scheme

(b)

In one stage vanadium oxide, V₂O₅, is used.

Based on the position of vanadium in the periodic table, which row shows the most likely melting point of vanadium and colour of vanadium oxide?

[1]

Reveal mark scheme

(c)

The equation shows a reaction forming sulfuric acid.

(c)(i)

Calculate the maximum mass of sulfuric acid that could be produced from 400 tonnes of sulfur trioxide, SO₃.

(relative formula masses: SO₃ = 80, H₂SO₄ = 98)

maximum mass of sulfuric acid =_........ tonnes

[2]

Reveal mark scheme

(c)(ii)

Using a different amount of sulfur trioxide, it was calculated that 700 tonnes of sulfuric acid could be made.

The actual mass produced was 672 tonnes.

Calculate the percentage yield of sulfuric acid.

percentage yield =_........

[2]

Reveal mark scheme

(c)(iii)

State two reasons why the percentage yield is less than 100 %.

[2]

Reveal mark scheme

Paper 1 June 2022 Foundation tier, Question 10 11 marks

Sucrose is a carbohydrate.

When a solution of sucrose is fermented using yeast, ethanol is formed.

sucrose + water maths symbol ethanol + carbon dioxide

(a)

In one experiment, 100.00 g of sucrose was dissolved in water.

Yeast was added and the mixture allowed to ferment until no more bubbles of carbon dioxide were seen to be formed.

The ethanol was obtained from the mixture and its mass determined.

The results are shown in Figure 16.

The percentage yield is calculated using

$Question 10, shown as an image$

(a)(i)

State the meanings of the terms actual yield and theoretical yield.

actual yield

theoretical yield

[2]

Reveal mark scheme

(a)(ii)

[2]

Reveal mark scheme

(a)(iii)

State two reasons why the actual yield of a reaction is usually less than the theoretical yield.

[2]

Reveal mark scheme

(b)

The balanced equation for the fermentation of sucrose is

$Question 10, shown as an image$

(b)(i)

Calculate the atom economy of this reaction to produce ethanol.

Give your answer to two significant figures.

(relative formula masses: C₁₂H₂₂O₁₁ = 342, H₂O = 18, C₂H₅OH = 46, CO₂ = 44)

[3]

Reveal mark scheme

(b)(ii)

Explain the effect on the atom economy of this reaction if the carbon dioxide produced was used to make fizzy drinks.

[2]

Reveal mark scheme

Paper 1 June 2022 Higher tier, Question 4 11 marks

Also involves Amounts of substance in equations

Sucrose is a carbohydrate.

When a solution of sucrose is fermented using yeast, ethanol is formed.

sucrose + water maths symbol ethanol + carbon dioxide

(a)

In one experiment, 100.00 g of sucrose was dissolved in water.

Yeast was added and the mixture allowed to ferment until no more bubbles of carbon dioxide were seen to be formed.

The ethanol was obtained from the mixture and its mass determined.

The results are shown in Figure 3.

The percentage yield is calculated using

$Question 4, shown as an image$

(a)(i)

State the meanings of the terms actual yield and theoretical yield.

actual yield

[2]

Reveal mark scheme

(a)(ii)

theoretical yield

Use the information in Figure 3 to calculate the percentage yield of ethanol in this experiment.

percentage yield =_........

[2]

Reveal mark scheme

(a)(iii)

State two reasons why the actual yield of a reaction is usually less than the theoretical yield.

[2]

Reveal mark scheme

(b)

The balanced equation for the fermentation of sucrose is

$Question 4, shown as an image$

(b)(i)

Calculate the atom economy of this reaction to produce ethanol.

Give your answer to two significant figures.

(relative formula masses: C₁₂H₂₂O₁₁ = 342, H₂O = 18, C₂H₅OH = 46, CO₂ = 44)

atom economy =_........

[3]

Reveal mark scheme

(b)(ii)

Explain the effect on the atom economy of this reaction if the carbon dioxide produced was used to make fizzy drinks.

[2]

Reveal mark scheme

Paper 1 November 2021 Foundation tier, Question 7 13 marks

Also involves Hazard symbols and risk assessment

(a)

This question is about the metal gold.

(a)(i)

Gold can be hammered into shape.

State the name of this property.

[1]

Reveal mark scheme

(a)(ii)

Gold alloys can be used to repair teeth. One reason that gold alloys are used is that they can be hammered into shape.

Give one other reason why gold alloys are used to repair teeth.

[1]

Reveal mark scheme

(b)

A gold alloy contains 78 % gold by mass.

Calculate the mass of gold in 2.00 kg of this alloy. Give your answer in grams.

[3]

Reveal mark scheme

(c)

A substance used to purify gold is kept in a container. There are some hazard symbols on the container.

Draw one straight line from each hazard symbol to its meaning.

[2]

Reveal mark scheme

(d)

*(d) Some gold alloys contain copper.

Copper reacts with oxygen when heated.

copper + oxygen maths symbol copper oxide

A teacher calculates that 1.20 g of copper reacts completely with oxygen to form 1.50 g of copper oxide.

A student heats 1.20 g of copper pieces in a container. Then they heat 1.20 g of copper powder in another container. After heating, the mass of the solid in the containers is found.

The results are shown in Figure 7.

Explain the observations and give reasons why the masses after heating are less than expected.

[6]

Reveal mark scheme

Paper 1 November 2021 Higher tier, Question 1 7 marks

Also involves Thermal decomposition

When heated, zinc carbonate decomposes to form zinc oxide and carbon dioxide gas.

$Question 1, shown as an image$

(a)

A student investigated the decomposition of a sample of zinc carbonate.

The student used the following method.

step 1 the mass of an empty crucible was determined

step 2 a sample of zinc carbonate was placed into the crucible

step 3 the mass of the crucible and the zinc carbonate was determined

step 4 the crucible and zinc carbonate was heated for five minutes

step 5 the mass of the crucible and contents was determined.

Figure 1 shows the apparatus used.

Suggest how the student could confirm that the decomposition was complete.

[3]

Reveal mark scheme

(b)

The theoretical maximum yield of zinc oxide was 1.86 g.

The actual yield was 1.63 g.

Calculate the percentage yield of zinc oxide.

percentage yield =_........

[2]

Reveal mark scheme

(c)

Another student carried out the experiment using a similar method. The student used a blue, roaring Bunsen burner flame and placed a lid on the crucible.

State why the student used a blue, roaring flame and a lid.

why a blue, roaring flame_........

[2]

Reveal mark scheme

Paper 1 November 2020 Foundation tier, Question 10 11 marks

Potassium hydroxide reacts with hydrochloric acid to form potassium chloride and water.

potassium hydroxide + hydrochloric acid maths symbol potassium chloride + water

(a)

A student carried out a titration to find the exact volume of dilute hydrochloric acid that reacted with 25.0 cm³ of potassium hydroxide solution.

There were five steps in the titration. The steps shown are not in the correct order.

step J pour the potassium hydroxide solution into a conical flask and add a few drops of indicator to this solution step K fill a burette with the dilute hydrochloric acid and record the initial reading from the burette step L use a measuring cylinder to obtain 25 cm³ of potassium hydroxide solution step M take a final reading from the burette and calculate the volume of the dilute hydrochloric acid reacted step N run the dilute hydrochloric acid from the burette into the conical flask until the indicator changes colour

(a)(i)

Write the steps in the correct order.

Some of the steps have been completed for you.

first step last step

[1]

Reveal mark scheme

(a)(ii)

Suggest an alternative piece of apparatus that could be used in step L to obtain exactly 25.0 cm³ of potassium hydroxide solution.

[1]

Reveal mark scheme

(b)

A student was then asked to produce a pure sample of solid potassium chloride.

After finding the volume of acid reacted in step M, the student added this volume of acid to a fresh 25.0 cm³ sample of the potassium hydroxide solution. This mixture was then evaporated.

(b)(i)

Explain why this new mixture was evaporated rather than the original mixture from the titration, to produce a pure sample of solid potassium chloride.

[2]

Reveal mark scheme

(b)(ii)

After evaporation, the mass of the potassium chloride was determined.

The theoretical yield of the experiment was 0.70 g. The actual yield was 0.84 g.

This gave a percentage yield greater than 100%.

Calculate the percentage yield of this experiment.

percentage yield =_........

[2]

Reveal mark scheme

(b)(iii)

Suggest a reason why the actual yield was greater than the theoretical yield.

[1]

Reveal mark scheme

(b)(iv)

The equation for the reaction between potassium hydroxide solution and dilute hydrochloric acid is

$Question 10, shown as an image$

Calculate the atom economy for the production of potassium chloride from potassium hydroxide and hydrochloric acid. (relative formula masses: KOH = 56.0, HCl = 36.5, KCl = 74.5, H₂O = 18.0)

Give your answer to one decimal place.

atom economy =_........

[4]

Reveal mark scheme

Paper 1 November 2020 Higher tier, Question 4 11 marks

Also involves Relative formula mass

Potassium hydroxide reacts with hydrochloric acid to form potassium chloride and water.

potassium hydroxide + hydrochloric acid maths symbol potassium chloride + water

(a)

A student carried out a titration to find the exact volume of dilute hydrochloric acid that reacted with 25.0 cm³ of potassium hydroxide solution.

There were five steps in the titration. The steps shown are not in the correct order.

(a)(i)

Write the steps in the correct order.

Some of the steps have been completed for you.

first step
last step

[1]

Reveal mark scheme

(a)(ii)

Suggest an alternative piece of apparatus that could be used in step L to obtain exactly 25.0 cm³ of potassium hydroxide solution.

[1]

Reveal mark scheme

(b)

A student was then asked to produce a pure sample of solid potassium chloride.

After finding the volume of acid reacted in step M, the student added this volume of acid to a fresh 25.0 cm³ sample of the potassium hydroxide solution. This mixture was then evaporated.

(b)(i)

Explain why this new mixture was evaporated rather than the original mixture from the titration, to produce a pure sample of solid potassium chloride.

[2]

Reveal mark scheme

(b)(ii)

After evaporation, the mass of the potassium chloride was determined.

The theoretical yield of the experiment was 0.70 g. The actual yield was 0.84 g.

This gave a percentage yield greater than 100%.

Calculate the percentage yield of this experiment.

[2]

Reveal mark scheme

(b)(iii)

Suggest a reason why the actual yield was greater than the theoretical yield.

[1]

Reveal mark scheme

(b)(iv)

The equation for the reaction between potassium hydroxide solution and dilute hydrochloric acid is

$Question 4, shown as an image$

Calculate the atom economy for the production of potassium chloride from potassium hydroxide and hydrochloric acid. (relative formula masses: KOH = 56.0, HCl = 36.5, KCl = 74.5, H₂O = 18.0)

Give your answer to one decimal place.

[4]

Reveal mark scheme

Paper 1 June 2019 Higher tier, Question 4 11 marks

Calcium carbonate decomposes on heating to form calcium oxide and carbon dioxide.

$Question 4, shown as an image$

(a)

8.000 g of CaCO₃ was heated strongly for about 10 minutes. 6.213 g of solid remained. Calculate the mass of carbon dioxide gas given off.

[1]

Reveal mark scheme

(b)

A second sample of calcium carbonate is strongly heated in a crucible until there is no further loss in mass. The mass of calcium oxide remaining in the crucible is 5.450 g.

(b)(i)

The theoretical yield of calcium oxide in this experiment is 5.600 g.

Calculate the percentage yield of calcium oxide.

[2]

Reveal mark scheme

(b)(ii)

The mass of solid left in the crucible is less than the theoretical mass of calcium oxide that should be obtained.

A possible reason for this is that

$Question 4, shown as an image$

[1]

Reveal mark scheme

(c)

Another sample of calcium carbonate is heated and the mass of solid remaining is measured each minute.

The results are shown in Figure 3.

(c)(i)

Explain the trend shown by the data in Figure 3.

[2]

Reveal mark scheme

(c)(ii)

It is impossible to be sure from this data that the reaction is complete.

State why.

[1]

Reveal mark scheme

(d)(i)

Calculate the relative formula mass of calcium carbonate, CaCO₃. (relative atomic masses: C = 12, O = 16, Ca = 40)

[2]

Reveal mark scheme

(d)(ii)

Calculate the atom economy for the formation of calcium oxide in this reaction.

$Question 4, shown as an image$

You must show your working. (relative atomic masses: C = 12, O = 16, Ca = 40; relative formula mass: calcium oxide = 56)

[2]

Reveal mark scheme

Paper 1 June 2018 Foundation tier, Question 10 11 marks

(a) Hydrogen burns in air at a temperature well above 100 °C to form water.

(a)

(a)(i)

The boiling points of hydrogen and water are shown in Figure 15.

Use this information to add the missing state symbols to the equation for the reaction taking place as the hydrogen burns.

$Question 10, shown as an image$

[2]

Reveal mark scheme

(a)(ii)

The atom economy for the reaction in (i) is 100%.

State how the equation shows that the atom economy is 100%.

[1]

Reveal mark scheme

(b)

Lead can be obtained by heating its oxide with carbon. The balanced equation for the reaction is

$Question 10, shown as an image$

Calculate the atom economy for the production of lead in this reaction. (relative atomic masses: C = 12, O = 16, Pb = 207 relative formula masses: PbO = 223, CO₂ = 44)

Give your answer to two significant figures.

[4]

Reveal mark scheme

(c)(i)

In an experiment to produce lead, 7.67 g of lead are obtained. The theoretical yield of lead for the experiment is 11.80 g.

Calculate the percentage yield of lead in this experiment.

[2]

Reveal mark scheme

(c)(ii)

In most reactions, the percentage yield of any product is less than 100%.

Give two reasons why the percentage yield is less than 100%.

[2]

Reveal mark scheme

Paper 1 June 2018 Higher tier, Question 4 11 marks

Also involves The three states of matter

(a) Hydrogen burns in air at a temperature well above 100 maths symbol C to form water.

(a)

(a)(i)

The boiling points of hydrogen and water are shown in Figure 3.

	boiling point in C
hydrogen	−253
water	100

$Question 4, shown as an image$

Use this information to add the missing state symbols to the equation for the reaction taking place as the hydrogen burns.

$Question 4, shown as an image$

[2]

Reveal mark scheme

(a)(ii)

The atom economy for the reaction in (i) is 100%.

State how the equation shows that the atom economy is 100%.

[1]

Reveal mark scheme

(b)

Lead can be obtained by heating its oxide with carbon. The balanced equation for the reaction is

$Question 4, shown as an image$

Calculate the atom economy for the production of lead in this reaction. (relative atomic masses: C = 12, O = 16, Pb = 207 relative formula masses: PbO = 223, CO₂ = 44)

Give your answer to two significant figures.

[4]

Reveal mark scheme

(c)(i)

In an experiment to produce lead, 7.67 g of lead are obtained. The theoretical yield of lead for the experiment is 11.80 g.

Calculate the percentage yield of lead in this experiment.

[2]

Reveal mark scheme

(c)(ii)

In most reactions, the percentage yield of any product is less than 100%.

Give two reasons why the percentage yield is less than 100%.

[2]

Reveal mark scheme

Report a problem with a question on this page

Question

What is wrong?

Text or a picture is cut off or split Something on the paper is not here The text does not read properly The marks are wrong Something else

Goes to whoever maintains the question split. No account needed and nothing is published on this page.

Memes

Certified Chemistry memes. Peer-reviewed by nobody.

Laugh now. Cry in the exam hall later. Then come back and do a past paper.

Do the mole calculation

Write ‘exothermic’ and pray

Me on the 6-marker about electrolysis

Knowing water is H₂O

Balancing an equation first try

Getting two concordant titres

Realising nobody actually knows what a mole is

Chemistry enlightenment, ranked

Mum 💖

how's chemistry going love?? 🥰

we're doing bonding rn

aww that's lovely 💕

📱 Screen time this week · TikTok6h 2m

Zero bonds were formed

Chemistry starter pack

Goggles that fog instantlyBunsen on the orange flameBurette that's always leakingThis website

Goggles on, collect all four

Percentage yield

Percentage yield questions

Edexcel 1CH0 Percentage yield 15 questions

Paper 1 June 2025 Foundation tier, Question 10, also on the Higher paper Foundation Paper 1 · June 2025 · Question 10 Also on Higher 11 marks

Paper 1 June 2025 Higher tier, Question 4, also on the Foundation paper Higher Paper 1 · June 2025 · Question 4 Also on Foundation 11 marks

Paper 1 June 2024 Foundation tier, Question 10 Foundation Paper 1 · June 2024 · Question 10 11 marks

Paper 1 June 2024 Higher tier, Question 4 Higher Paper 1 · June 2024 · Question 4 11 marks

Paper 1 June 2023 Foundation tier, Question 10 Foundation Paper 1 · June 2023 · Question 10 11 marks

Paper 1 June 2023 Higher tier, Question 4 Higher Paper 1 · June 2023 · Question 4 11 marks

Paper 1 June 2022 Foundation tier, Question 10 Foundation Paper 1 · June 2022 · Question 10 11 marks

Paper 1 June 2022 Higher tier, Question 4 Higher Paper 1 · June 2022 · Question 4 11 marks

Paper 1 November 2021 Foundation tier, Question 7 Foundation Paper 1 · November 2021 · Question 7 13 marks

Paper 1 November 2021 Higher tier, Question 1 Higher Paper 1 · November 2021 · Question 1 7 marks

Paper 1 November 2020 Foundation tier, Question 10 Foundation Paper 1 · November 2020 · Question 10 11 marks

Paper 1 November 2020 Higher tier, Question 4 Higher Paper 1 · November 2020 · Question 4 11 marks

Paper 1 June 2019 Higher tier, Question 4 Higher Paper 1 · June 2019 · Question 4 11 marks

Paper 1 June 2018 Foundation tier, Question 10 Foundation Paper 1 · June 2018 · Question 10 11 marks

Paper 1 June 2018 Higher tier, Question 4 Higher Paper 1 · June 2018 · Question 4 11 marks

Certified Chemistry memes. Peer-reviewed by nobody.

Paper 1 June 2025 Foundation tier, Question 10, also on the Higher paper 11 marks

Paper 1 June 2025 Higher tier, Question 4, also on the Foundation paper 11 marks

Paper 1 June 2024 Foundation tier, Question 10 11 marks

Paper 1 June 2024 Higher tier, Question 4 11 marks

Paper 1 June 2023 Foundation tier, Question 10 11 marks

Paper 1 June 2023 Higher tier, Question 4 11 marks

Paper 1 June 2022 Foundation tier, Question 10 11 marks

Paper 1 June 2022 Higher tier, Question 4 11 marks

Paper 1 November 2021 Foundation tier, Question 7 13 marks

Paper 1 November 2021 Higher tier, Question 1 7 marks

Paper 1 November 2020 Foundation tier, Question 10 11 marks

Paper 1 November 2020 Higher tier, Question 4 11 marks

Paper 1 June 2019 Higher tier, Question 4 11 marks

Paper 1 June 2018 Foundation tier, Question 10 11 marks

Paper 1 June 2018 Higher tier, Question 4 11 marks