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Q1. An atom of chlorine-37 contains how many neutrons?
A. 17
B. 18
C. 20
D. 37
Show answer & explanation
✓ Answer: B. 18
Neutrons = mass number − atomic number = 37 − 17 = 20. Chlorine always has 17 protons (that defines the element); the '18' distractor confuses proton count with neutron count for the more common isotope chlorine-35.
Q2. A student burns 0.50 g of ethanol under a copper calorimeter containing 100 g of water, raising its temperature from 20.0°C to 42.5°C. Using q = mcΔT (c = 4.18 J g⁻¹ K⁻¹), what is the enthalpy change of combustion per mole of ethanol (Mr = 46), to 2 significant figures?
A. −870 kJ mol⁻¹
B. −94 kJ mol⁻¹
C. −43 kJ mol⁻¹
D. −9.4 kJ mol⁻¹
Show answer & explanation
✓ Answer: A. −870 kJ mol⁻¹
q = mc(delta)T = 100 x 4.18 x 22.5 = 9405 J = 9.405 kJ. Moles of ethanol = 0.50/46 = 0.01087 mol. Enthalpy of combustion per mole = -9.405/0.01087 = -865 kJ mol-1, which rounds to -870 kJ mol-1 to 2 s.f. This is far less exothermic than the data-book value (-1367 kJ mol-1) because of heat loss to the surroundings and incomplete combustion in a simple calorimeter.
Q3. Which of the following would cause the measured electrode potential of a Cu2+/Cu half-cell to become more negative than its standard value?
A. Increasing the Cu2+ concentration above 1 mol dm-3
B. Decreasing the Cu2+ concentration below 1 mol dm-3
C. Increasing the temperature to 298 K exactly
D. Using a larger copper electrode
Show answer & explanation
✓ Answer: B. Decreasing the Cu2+ concentration below 1 mol dm-3
By Le Chatelier's principle, lowering the Cu2+ concentration shifts the equilibrium Cu2+ + 2e- ⇌ Cu to the left, reducing the tendency to gain electrons, which makes the electrode potential more negative than the standard +0.34 V. Electrode potentials are concentration-dependent, which is why standard conditions are defined precisely.
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Who has to sit the A-Level Chemistry (Edexcel)
Who needs a A-Level Chemistry (Edexcel)?
Students aiming for higher education in science, medicine, pharmacology, biochemistry, and related fields.
The real A-Level Chemistry (Edexcel): format
How long is the A-Level Chemistry (Edexcel)?
The real A-Level Chemistry (Edexcel) lasts 360 minutes. Our mock uses 40 questions in 60 minutes.
What is the A-Level Chemistry (Edexcel) pass mark?
Real exam pass mark: 68/300 (E grade in June 2026). Our mock marks you at 24 out of 40, the threshold we mark against.
What it costs, and what a resit costs
How much does the A-Level Chemistry (Edexcel) cost?
Rebooking after a fail: Aligned with next available annual exam series (typically Summer). Modular International A-Levels offer more frequent resit windows.
How hard is it
What is the A-Level Chemistry (Edexcel) pass rate?
Real exam first-time pass rate: 95.6% (A*-E in 2026). Difficulty: Demanding, requiring strong problem-solving, mathematical skills, and deep understanding of concepts beyond memorization.
Figures for the real exam from vertexaisearch.cloud.google.com, google.com, checked October 2026. Fees and rules change, so confirm with the test provider before you book.
A-Level Chemistry (Edexcel): common questions
Frequently asked
How many questions are in the A-Level Chemistry (Edexcel)?
The exam has 40 questions. Every Revision Robin mock uses the same 40-question format so your practice matches the real thing.
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.