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OCR · GCSE · Chemistry

Free OCR GCSE Chemistry
Practice Paper

8 mixed-difficulty practice questions in the style of real OCR GCSE papers — answers, mark-scheme-style explanations, and the official exam structure all on one page.

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What the real OCR GCSE Chemistry paper looks like

Paper 1
Approximately 1 hour 30 minutes, ~70-100 marks. Covers Topics 1-4 of the specification.
Paper 2
Approximately 1 hour 30 minutes, ~70-100 marks. Covers Topics 5-8 of the specification.
Paper 3
Where applicable — e.g. Combined Science, Languages. Includes synoptic and applied questions.
Total exam time: ~3 hours across two or three papers.
Grading: Grades: 9 (highest) to 1 (lowest), with U (ungraded). A grade of 4 is a standard pass; 5 is a strong pass.

Mini practice paper: 8 questions

Mixed-difficulty questions from across the Chemistry syllabus. Tap "Show answer" after each to check yourself.

Q1 · Difficulty 1/3

What is the relative mass of a neutron?

  1. 0
  2. −1
  3. 1/1840
  4. 1
Show answer & explanation
✓ Answer: D — 1
Award 1 mark. Protons and neutrons each have a relative mass of 1. An electron's mass is about 1/1840, which is often treated as negligible.
Q2 · Difficulty 1/3

Roughly how wide is an atom?

  1. About 1 millimetre
  2. About 1 micrometre
  3. About 0.1 nanometres
  4. About 1 centimetre
Show answer & explanation
✓ Answer: C — About 0.1 nanometres
1 nanometres. Award 1 mark. Atoms have a radius of about 1 × 10⁻¹⁰ m, or 0.1 nm, far too small to see even with a light microscope.
Q3 · Difficulty 1/3

Where are the electrons found in an atom?

  1. Inside the nucleus with the protons
  2. Spread evenly through the atom
  3. In shells around the nucleus
  4. Only in the centre of the atom
Show answer & explanation
✓ Answer: C — In shells around the nucleus
Award 1 mark. The nucleus contains protons and neutrons; electrons occupy shells (energy levels) around it.
Q4 · Difficulty 1/3

During condensation a gas changes to a:

  1. plasma
  2. gas
  3. liquid
  4. solid
Show answer & explanation
✓ Answer: C — liquid
Condensation is gas → liquid.
Q5 · Difficulty 1/3

A substance made of only one type of atom is an:

  1. alloy
  2. element
  3. compound
  4. mixture
Show answer & explanation
✓ Answer: B — element
An element contains one type of atom.
Q6 · Difficulty 1/3

What is the relative mass of an electron?

  1. 1
  2. 2
  3. 0.5
  4. Very small, about 1/1840
Show answer & explanation
✓ Answer: D — Very small, about 1/1840
Award 1 mark. An electron's mass is about 1/1840 of a proton's, which is why the mass of an atom is almost all in its nucleus.
Q7 · Difficulty 1/3

Which state of matter can be easily compressed?

  1. None of them
  2. Gas
  3. Solid
  4. Liquid
Show answer & explanation
✓ Answer: B — Gas
Gases have large gaps between particles, so they compress easily.
Q8 · Difficulty 1/3

What happens to the mass of a substance when it melts?

  1. It increases
  2. It decreases
  3. It stays the same
  4. It becomes zero
Show answer & explanation
✓ Answer: C — It stays the same
Award 1 mark. Melting is a physical change: the same particles are rearranged, so the mass is conserved.
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OCR GCSE Chemistry FAQ

What does the OCR GCSE Chemistry exam look like?
The OCR GCSE Chemistry exam is structured across 3 components. Paper 1: Approximately 1 hour 30 minutes, ~70-100 marks. Covers Topics 1-4 of the specification. Paper 2: Approximately 1 hour 30 minutes, ~70-100 marks. Covers Topics 5-8 of the specification. Paper 3: Where applicable — e.g. Combined Science, Languages. Includes synoptic and applied questions. Total exam time: ~3 hours across two or three papers.
Can I download a free OCR GCSE Chemistry past paper?
Real OCR past papers are published directly by OCR on their official website. Kramizo doesn't redistribute copyrighted past papers, but we do generate free AI-written practice papers in the exact same style — same command words, same difficulty tier, same mark conventions. Use this practice paper as warm-up, then time yourself on official past papers before exam day.
How is OCR GCSE Chemistry graded?
Grades: 9 (highest) to 1 (lowest), with U (ungraded). A grade of 4 is a standard pass; 5 is a strong pass. Kramizo's practice questions are tagged with difficulty 1-3 mapping roughly to the lower, middle, and top grade boundaries you'll encounter in the real exam.