Free Pearson Edexcel GCSE Chemistry (1CH0) Exam Questions and Answers
Pearson Edexcel GCSE Chemistry (1CH0) is Pearson Edexcel's GCSE Chemistry qualification, specification 1CH0, taken in England. It is sat at Foundation or Higher tier. The questions here come from Pearson Edexcel's published question papers from June 2018 to June 2025, plus its specimen papers, with answers and marking guidance taken from Pearson Edexcel's own mark schemes. Written-answer questions let you work out your answer and then reveal what the mark scheme accepts; diagrams, graphs and source material appear with the questions that use them.
Candidates comparing Pearson Edexcel GCSE Chemistry (1CH0) exam dumps, ExamTopics and other practice tests use this page for the answers and explanations behind each question. Download the free PDF, then sit the timed exam simulation before booking with Pearson Edexcel.
Last updated: October 15, 2026
- Provider
- Pearson Edexcel
- Questions in our bank
- 1000+
- Free to read
- First 10, with answers
- Our test mode duration & pass mark
- 130 mins · 70%
- Verified answers
- Reviewed weekly
- Practice format
- Written answers & multiple choice
Recommended: Switch to Test Mode to start a practice test that simulates the real exam experience.
Question #1
Ammonia can be manufactured by the Haber process. The word equation for the reaction is nitrogen + hydrogen ⇌ ammonia State the meaning of the ⇌ symbol.
Type your answer, then reveal.
Correct answer: The reaction is reversible / can go both ways.
Explanation
Or equivalent. Allow reaction happening forwards and backwards. Allow equilibrium.
Continue with Pearson Edexcel GCSE Chemistry (1CH0)
Unlock the full question bank
You have read the first 10 questions. A subscription opens every question in Pearson Edexcel GCSE Chemistry (1CH0), the full timed practice test, and your progress and weak-topic reporting.
Single exam
$19.99for 30 days
Full question bank and practice test for one exam, for 30 days.
Single exam
$49.99for 1 year
One exam for a full year. Nothing renews and nothing to cancel.
Full access
$39.99/mo
Every exam in the catalogue, month to month.
Full access
$199.99/yr
Every exam in the catalogue for a year.
Already subscribed? Sign in to pick up where you left off.
Question #2
In the Haber process, the percentage yield of ammonia at equilibrium changes with temperature. Figure 2 shows how the percentage yield of ammonia at equilibrium changes with temperature. State what happens to the percentage yield of ammonia at equilibrium as the temperature increases.
Type your answer, then reveal.
Correct answer: The percentage yield of ammonia decreases / goes down.
Explanation
Allow 'goes lower'.
Continue with Pearson Edexcel GCSE Chemistry (1CH0)
Unlock the full question bank
You have read the first 10 questions. A subscription opens every question in Pearson Edexcel GCSE Chemistry (1CH0), the full timed practice test, and your progress and weak-topic reporting.
Single exam
$19.99for 30 days
Full question bank and practice test for one exam, for 30 days.
Single exam
$49.99for 1 year
One exam for a full year. Nothing renews and nothing to cancel.
Full access
$39.99/mo
Every exam in the catalogue, month to month.
Full access
$199.99/yr
Every exam in the catalogue for a year.
Already subscribed? Sign in to pick up where you left off.
Question #3
In the Haber process, the percentage yield of ammonia at equilibrium changes with temperature. Use the graph to find the percentage yield of ammonia at equilibrium at 450°C. percentage yield of ammonia at equilibrium = ____
Type your answer, then reveal.
Correct answer: Any value between 15 and 16 inclusive (%).
Explanation
Any number from 15 to 16 inclusive scores the mark.
Continue with Pearson Edexcel GCSE Chemistry (1CH0)
Unlock the full question bank
You have read the first 10 questions. A subscription opens every question in Pearson Edexcel GCSE Chemistry (1CH0), the full timed practice test, and your progress and weak-topic reporting.
Single exam
$19.99for 30 days
Full question bank and practice test for one exam, for 30 days.
Single exam
$49.99for 1 year
One exam for a full year. Nothing renews and nothing to cancel.
Full access
$39.99/mo
Every exam in the catalogue, month to month.
Full access
$199.99/yr
Every exam in the catalogue for a year.
Already subscribed? Sign in to pick up where you left off.
Question #4
Ammonia reacts with nitric acid to form ammonium nitrate. Complete the word equation for this reaction. ____ + ____ → ____
Type your answer, then reveal.
Correct answer: ammonia + nitric acid → ammonium nitrate
Explanation
Reactants can be in either order. Ignore formulae.
Continue with Pearson Edexcel GCSE Chemistry (1CH0)
Unlock the full question bank
You have read the first 10 questions. A subscription opens every question in Pearson Edexcel GCSE Chemistry (1CH0), the full timed practice test, and your progress and weak-topic reporting.
Single exam
$19.99for 30 days
Full question bank and practice test for one exam, for 30 days.
Single exam
$49.99for 1 year
One exam for a full year. Nothing renews and nothing to cancel.
Full access
$39.99/mo
Every exam in the catalogue, month to month.
Full access
$199.99/yr
Every exam in the catalogue for a year.
Already subscribed? Sign in to pick up where you left off.
Question #5
Ammonia reacts with nitric acid to form ammonium nitrate. An ammonium ion has the formula NH₄⁺. A nitrate ion has the formula NO₃⁻. Which of the following is the formula for ammonium nitrate?
Correct answer: C
Explanation
Only C is correct.
Continue with Pearson Edexcel GCSE Chemistry (1CH0)
Unlock the full question bank
You have read the first 10 questions. A subscription opens every question in Pearson Edexcel GCSE Chemistry (1CH0), the full timed practice test, and your progress and weak-topic reporting.
Single exam
$19.99for 30 days
Full question bank and practice test for one exam, for 30 days.
Single exam
$49.99for 1 year
One exam for a full year. Nothing renews and nothing to cancel.
Full access
$39.99/mo
Every exam in the catalogue, month to month.
Full access
$199.99/yr
Every exam in the catalogue for a year.
Already subscribed? Sign in to pick up where you left off.
Question #6
Ammonia reacts with nitric acid to form ammonium nitrate. Explain why farmers spread ammonium nitrate on their fields.
Type your answer, then reveal.
Correct answer: It is used as a fertiliser because it contains (a high percentage of) nitrogen, which helps promote plant growth / increases crop yield.
Explanation
Explanation linking two from: as a fertiliser; contains (a high percentage of) nitrogen; helps promote plant growth / increases crop yield. Allow 'make crops grow faster'. Ignore use as a pesticide.
Continue with Pearson Edexcel GCSE Chemistry (1CH0)
Unlock the full question bank
You have read the first 10 questions. A subscription opens every question in Pearson Edexcel GCSE Chemistry (1CH0), the full timed practice test, and your progress and weak-topic reporting.
Single exam
$19.99for 30 days
Full question bank and practice test for one exam, for 30 days.
Single exam
$49.99for 1 year
One exam for a full year. Nothing renews and nothing to cancel.
Full access
$39.99/mo
Every exam in the catalogue, month to month.
Full access
$199.99/yr
Every exam in the catalogue for a year.
Already subscribed? Sign in to pick up where you left off.
Question #7
A titration of sodium hydroxide solution with hydrochloric acid can be carried out as follows 1 a pipette is used to measure 25.00 cm³ of sodium hydroxide solution into a conical flask 2 a few drops of indicator are added to the sodium hydroxide solution 3 the burette is filled with hydrochloric acid 4 the hydrochloric acid is added to the sodium hydroxide solution until the indicator changes colour. Describe how the pipette should be used to measure exactly 25.00 cm³ of sodium hydroxide solution into the conical flask.
Type your answer, then reveal.
Correct answer: Use a pipette filler; rinse the pipette with sodium hydroxide solution; draw the liquid up until the bottom of the meniscus touches the line.
Explanation
Any two of: use a pipette filler; wash the pipette with sodium hydroxide solution; draw the liquid up so the bottom of the meniscus touches the line.
Continue with Pearson Edexcel GCSE Chemistry (1CH0)
Unlock the full question bank
You have read the first 10 questions. A subscription opens every question in Pearson Edexcel GCSE Chemistry (1CH0), the full timed practice test, and your progress and weak-topic reporting.
Single exam
$19.99for 30 days
Full question bank and practice test for one exam, for 30 days.
Single exam
$49.99for 1 year
One exam for a full year. Nothing renews and nothing to cancel.
Full access
$39.99/mo
Every exam in the catalogue, month to month.
Full access
$199.99/yr
Every exam in the catalogue for a year.
Already subscribed? Sign in to pick up where you left off.
Question #8
A titration of sodium hydroxide solution with hydrochloric acid can be carried out as follows 1 a pipette is used to measure 25.00 cm³ of sodium hydroxide solution into a conical flask 2 a few drops of indicator are added to the sodium hydroxide solution 3 the burette is filled with hydrochloric acid 4 the hydrochloric acid is added to the sodium hydroxide solution until the indicator changes colour. The burette is first washed with water. It is then rinsed with some of the acid before it is filled with the acid to begin the titration. Explain why the burette is rinsed with the acid.
Type your answer, then reveal.
Correct answer: To remove water from the burette, because water would dilute the acid and give an inaccurate result.
Explanation
Any two linked points: removes water from the burette; water would dilute the original acid; this would give an inaccurate result (or the reverse argument). Ignore 'to avoid contamination' and 'to kill bacteria'.
Continue with Pearson Edexcel GCSE Chemistry (1CH0)
Unlock the full question bank
You have read the first 10 questions. A subscription opens every question in Pearson Edexcel GCSE Chemistry (1CH0), the full timed practice test, and your progress and weak-topic reporting.
Single exam
$19.99for 30 days
Full question bank and practice test for one exam, for 30 days.
Single exam
$49.99for 1 year
One exam for a full year. Nothing renews and nothing to cancel.
Full access
$39.99/mo
Every exam in the catalogue, month to month.
Full access
$199.99/yr
Every exam in the catalogue for a year.
Already subscribed? Sign in to pick up where you left off.
Question #9
Universal indicator solution is not a suitable indicator for an acid-alkali titration. Give the name of an indicator that is suitable for use in the titration of sodium hydroxide solution with hydrochloric acid.
Type your answer, then reveal.
Correct answer: Phenolphthalein or methyl orange
Explanation
Allow litmus, screened methyl orange or methyl red. Ignore litmus paper and pH meter/probe.
Continue with Pearson Edexcel GCSE Chemistry (1CH0)
Unlock the full question bank
You have read the first 10 questions. A subscription opens every question in Pearson Edexcel GCSE Chemistry (1CH0), the full timed practice test, and your progress and weak-topic reporting.
Single exam
$19.99for 30 days
Full question bank and practice test for one exam, for 30 days.
Single exam
$49.99for 1 year
One exam for a full year. Nothing renews and nothing to cancel.
Full access
$39.99/mo
Every exam in the catalogue, month to month.
Full access
$199.99/yr
Every exam in the catalogue for a year.
Already subscribed? Sign in to pick up where you left off.
Question #10
Universal indicator solution is not a suitable indicator for an acid-alkali titration. Universal indicator goes through a series of gradual colour changes as the pH changes in a solution. Give a reason why universal indicator is not a suitable indicator to use in an acid-alkali titration.
Type your answer, then reveal.
Correct answer: It does not show a sharp colour change at the end point / it is not known which colour change gives the correct end point.
Explanation
Allow 'does not have a definite end point'. Ignore 'goes through a series of gradual colour changes'.
Continue with Pearson Edexcel GCSE Chemistry (1CH0)
Unlock the full question bank
You have read the first 10 questions. A subscription opens every question in Pearson Edexcel GCSE Chemistry (1CH0), the full timed practice test, and your progress and weak-topic reporting.
Single exam
$19.99for 30 days
Full question bank and practice test for one exam, for 30 days.
Single exam
$49.99for 1 year
One exam for a full year. Nothing renews and nothing to cancel.
Full access
$39.99/mo
Every exam in the catalogue, month to month.
Full access
$199.99/yr
Every exam in the catalogue for a year.
Already subscribed? Sign in to pick up where you left off.
Discussion
Explain your reasoning, not just the letterOther Pearson Edexcel certifications
- Pearson Edexcel GCSE Religious Studies B (1RB0) (opens in a new tab)
- Pearson Edexcel GCSE Combined Science (1SC0) (opens in a new tab)
- Pearson Edexcel GCSE Mathematics (1MA1) (opens in a new tab)
- Pearson Edexcel GCSE Statistics (1ST0) (opens in a new tab)
- Pearson Edexcel GCSE Biology (1BI0) (opens in a new tab)
- Pearson Edexcel GCSE Physics (1PH0) (opens in a new tab)
- Pearson Edexcel GCSE Religious Studies A (1RA0) (opens in a new tab)
- Pearson Edexcel GCSE French (1FR0) (opens in a new tab)
- Pearson Edexcel GCSE German (1GN0) (opens in a new tab)
- Pearson Edexcel GCSE Spanish (1SP0) (opens in a new tab)
- Pearson Edexcel GCSE Design and Technology (1DT0) (opens in a new tab)
- Pearson Edexcel GCSE Geography (1GB0) (opens in a new tab)
Reviews
Write a review★★★★★
Exam Practice is worth every penny. The mock exams are realistic, and the feedback helped me focus on key areas.
Amit SharmaVerified buyer
★★★★★
I highly recommend Exam Practice. The feedback after each test helped me improve significantly, and I passed my exams easily.
Oscar NyströmVerified buyer
★★★★★
This platform is a lifesaver. The practice questions and explanations are so detailed. It’s the best study tool I’ve ever used.
Hannah SmithVerified buyer