Edexcel A-Level Chemistry AS Paper 1, June 2025
Every question from Edexcel A-Level Chemistry AS Paper 1, June 2025 (8CH0): 8 questions, 80 marks, each with its mark scheme and topic.
- Question 1 8 marks
Define electronegativity, draw the dot-and-cross diagram for SiCl4, explain why Cl2 and SiCl4 are non-polar, and compare their boiling temperatures in terms of intermolecular forces.
Physical Chemistry · Topic 2: Bonding and Structure
- Question 2 14 marks
Describe and compare the bonding, structure, properties, and reactions of sodium, sodium chloride, and aluminium hydride compounds.
Physical Chemistry · Topic 2: Bonding and Structure · Topic 5: Formulae, Equations and Amounts of Substance
- Question 3 2 marks
Identify intermolecular forces present in water and explain the difference in water solubility between ethanol and ethanethiol.
Physical Chemistry · Topic 2: Bonding and Structure
- Question 4 15 marks
Analyze the reactions of magnesium with nitric acid and the thermal decomposition of magnesium nitrate, including gas collection, volume calculation, and significant figures.
Inorganic Chemistry · Physical Chemistry · Core Practicals · Topic 4: Inorganic Chemistry and the Periodic Table · Topic 5: Formulae, Equations and Amounts of Substance · Core Practical 1: Measuring the molar volume of a gas
- Question 5 15 marks
Deduce electron configurations and explain ionisation energy trends for zinc and magnesium, determine isotope properties including calculating the mass of an unknown isotope and the Avogadro constant, and find the value of x in hydrated zinc sulfate.
Physical Chemistry · Topic 1: Atomic Structure and the Periodic Table · Topic 5: Formulae, Equations and Amounts of Substance
- Question 6 10 marks
Explain the safety, observations, redox changes, half-equations, and reducing ability trends for the reactions of potassium iodide and potassium chloride with concentrated sulfuric acid.
Inorganic Chemistry · Physical Chemistry · Topic 4: Inorganic Chemistry and the Periodic Table · Topic 3: Redox I
- Question 7 10 marks
Explain periodic trends across Period 3 including atomic radius, first ionisation energy definitions, isoelectronic ions, and the pattern of first ionisation energies across the period.
Physical Chemistry · Topic 1: Atomic Structure and the Periodic Table
- Question 8 6 marks
Deduce the molecular formula of ferrocene using combustion analysis data and mass spectrometry data.
Physical Chemistry · Organic Chemistry · Topic 5: Formulae, Equations and Amounts of Substance · Topic 7: Modern Analytical Techniques I