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A-Level Chemistry (Edexcel)

Physical, inorganic and organic chemistry. Edexcel board.

Pass mark 24/40 60 minutes Edexcel How many can I get wrong?
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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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Atomic structure & bonding · 39
Energetics, kinetics & equilibria · 38
Redox & electrochemistry · 62
Inorganic & periodicity · 35
Organic chemistry I · 37
Organic chemistry II & analysis · 35
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.
What is the pass mark for the A-Level 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.