From Paper 1: Advanced Inorganic and Physical Chemistry
5(a)4 marks
0.85 g of a volatile liquid was vaporised at 373 K and 101 kPa. The vapour occupied 300 cm³. Calculate the molar mass.
From Paper 1: Advanced Inorganic and Physical Chemistry
5(b)6 marks
1.20 g of brass was dissolved in nitric acid, neutralised and made up to 250 cm³. 25.0 cm³ portions were added to excess KI. The iodine released needed 13.20 cm³ of 0.100 mol dm⁻³ sodium thiosulfate.
2Cu²⁺ + 4I⁻ → 2CuI + I₂
I₂ + 2S₂O₃²⁻ → 2I⁻ + S₄O₆²⁻
Calculate the percentage by mass of copper in the brass.
From Paper 1: Advanced Inorganic and Physical Chemistry
6(a)4 marks
Excess zinc was added to 25.0 cm³ of 0.200 mol dm⁻³ copper(II) sulfate. The temperature rose by 10.4 °C. Calculate ΔH for Zn + Cu²⁺ → Zn²⁺ + Cu. (Specific heat capacity of the solution = 4.18 J g⁻¹ °C⁻¹; density of the solution = 1.00 g cm⁻³.)
From Paper 3: General and Practical Principles in Chemistry
1(a)4 marks
A student titrated 25.0 cm³ of sodium hydroxide with 0.100 mol dm⁻³ hydrochloric acid. Her titres were 22.45, 22.10, 22.15 and 22.20 cm³. Calculate the mean titre using concordant results and the concentration of the sodium hydroxide.
From Paper 3: General and Practical Principles in Chemistry
1(b)3 marks
The burette reading uncertainty is ±0.05 cm³. Calculate the percentage uncertainty in a titre of 22.15 cm³ and suggest one way to reduce it.
From Paper 3: General and Practical Principles in Chemistry
2(a)5 marks
A spirit burner containing propan-1-ol heated 100 g of water from 20.5 °C to 45.0 °C. The burner lost 0.62 g. Calculate the enthalpy of combustion of propan-1-ol (Mᵣ 60.0) and explain why the value is much less exothermic than the data-book value (−2021 kJ mol⁻¹).
From Paper 3: General and Practical Principles in Chemistry
6(a)4 marks
An iron tablet containing iron(II) sulfate was dissolved in dilute sulfuric acid and titrated with 0.0100 mol dm⁻³ KMnO₄. The titre was 21.50 cm³. Calculate the mass of iron in the tablet.
From Paper 3: General and Practical Principles in Chemistry
106 marks
Describe how to measure the standard electrode potential of the Cu²⁺/Cu half-cell, including the conditions.
From Paper 3: General and Practical Principles in Chemistry
11(a)1 mark
What volume of 0.050 mol dm⁻³ H₂SO₄ is needed to neutralise 20.0 cm³ of 0.10 mol dm⁻³ NaOH?
From Paper 3: General and Practical Principles in Chemistry
135 marks
Describe how to determine the acid dissociation constant, Ka, of a weak acid using a pH meter and sodium hydroxide solution.
From Paper 3: General and Practical Principles in Chemistry
145 marks
2.46 g of hydrated magnesium sulfate, MgSO₄·xH₂O, was heated in a crucible until it reached constant mass. 1.20 g of anhydrous MgSO₄ remained. Calculate x, and explain why the sample is heated to constant mass. (Mᵣ MgSO₄ = 120.4)
From Paper 3: General and Practical Principles in Chemistry
168 marks
Describe a test for each of the following ions and give the positive result: NH₄⁺, SO₄²⁻, CO₃²⁻, Br⁻.
Score 0 / 55 · 0 of 12 marked
This paper is written by Plasmo in the style of the Edexcel A-Level Chemistry exam. It is not a past paper and is not produced or endorsed by the exam board.
Formulae, equations and amounts of substance Exam Questions: Edexcel A-Level Chemistry | Plasmo