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Q1. An atom of sodium has atomic number 11 and mass number 23. How many neutrons does it contain?
A. 11
B. 12
C. 23
D. 34
Show answer & explanation
✓ Answer: B. 12
Number of neutrons = mass number - atomic number = 23 - 11 = 12. Choosing 11 confuses neutrons with protons, and 23 confuses neutrons with the mass number itself.
Q2. Why do ionic compounds such as sodium chloride have high melting points?
A. The molecules are very large and heavy
B. There are many weak intermolecular forces to overcome
C. There are strong electrostatic forces between oppositely charged ions throughout the giant lattice, which need a lot of energy to break
D. The delocalised electrons hold the ions together very tightly
Show answer & explanation
✓ Answer: C. There are strong electrostatic forces between oppositely charged ions throughout the giant lattice, which need a lot of energy to break
Ionic compounds form giant lattices with strong electrostatic attractions extending in all directions between oppositely charged ions. A large amount of thermal energy is needed to overcome these many strong forces, giving high melting and boiling points. Ionic compounds do not consist of molecules.
Q3. What is the empirical formula of a compound containing 40% carbon, 6.7% hydrogen and 53.3% oxygen by mass? (Ar: C=12, H=1, O=16)
A. CH2O
B. C2H4O2
C. CHO
D. C2H6O
Show answer & explanation
✓ Answer: A. CH2O
Divide by Ar: C = 40/12 = 3.33, H = 6.7/1 = 6.7, O = 53.3/16 = 3.33. Dividing all by the smallest (3.33) gives ratio C:H:O = 1:2:1, so the empirical formula is CH2O.
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Who has to sit the GCSE Chemistry (Edexcel)
Who needs a GCSE Chemistry (Edexcel)?
Compulsory as part of science curriculum in UK schools (often combined science); vital for A-Level Chemistry & science degrees.
The real GCSE Chemistry (Edexcel): format
How many questions are in the GCSE Chemistry (Edexcel)?
The real GCSE Chemistry (Edexcel) has 2 questions and lasts 210 minutes. Our mock uses 40 questions in 60 minutes.
What it costs, and what a resit costs
How much does the GCSE Chemistry (Edexcel) cost?
Real exam fee: Typically £190-£500 for private candidates, varying by centre & services. Resit fee: Same as first entry, typically £190-£500 for private candidates.
How hard is it
What is the GCSE Chemistry (Edexcel) pass rate?
Real exam first-time pass rate: 91.3% achieving Grade 4 or above (Edexcel GCSE Chemistry, 2026). Difficulty: Considered difficult for top grades (8-9), requiring application & critical thinking beyond memorisation.
Why people fail it
Why do people fail the GCSE Chemistry (Edexcel)?
Confusion between types of bonding and structure, or incorrect melting point explanations.
Figures for the real exam from vertexaisearch.cloud.google.com, checked October 2026. Fees and rules change, so confirm with the test provider before you book.
GCSE Chemistry (Edexcel): common questions
Frequently asked
What is the pass mark for the GCSE Chemistry (Edexcel)?
You need 24 out of 40 correct to pass, which is about 60%. Our mocks mark you against this exact threshold.
How long do you get?
The test is timed at 60 minutes. Our full mock runs on the same clock so you can practise your pacing.
Are these the real exam questions?
No. Our questions are original and written to match the current syllabus, so they give realistic practice without copying the official paper. Every answer comes with a plain-English explanation. Always confirm current rules and content with Edexcel.