Eduqas A Level Chemistry
Eduqas A Level Chemistry AS Component 2: Energy, Rate and Chemistry of Carbon Compounds Exam Questions
Free Eduqas A Level Chemistry exam questions for AS Component 2: Energy, Rate and Chemistry of Carbon Compounds, with a mark scheme for every pack. Covers enthalpy changes, Hess's law, rates, Green chemistry, alkanes, alkenes, halogenoalkanes, alcohols, carboxylic acids and instrumental analysis.
AS Component 2: Energy, Rate and Chemistry of Carbon Compounds exam questions
8 question packs of real past exam questions, each with its mark scheme. Do not stop after a few: answer as many as you can without notes, then mark every answer with the mark scheme. The more questions you do, the more quickly you will spot how examiners ask about each idea.
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A-Level Chemistry Flashcards for 2027 Onwards
Every answer is written in mark scheme wording, so you learn exactly what examiners give marks for. Then test yourself with the questions on this page.
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About Eduqas A Level Chemistry AS Component 2: Energy, Rate and Chemistry of Carbon Compounds
AS Component 2 of the Eduqas AS Chemistry course covers energy changes, reaction rates and the first organic chemistry of the course. You study thermochemistry and Hess's law, collision theory and the Boltzmann distribution, the wider impact of chemistry on society and the environment, then organic nomenclature and isomerism, alkanes and alkenes, halogenoalkanes, alcohols and carboxylic acids, and instrumental analysis using mass, IR and NMR spectra. It leads into the A Level organic and physical content. Examiners like calorimetry calculations with error analysis, mechanisms such as radical substitution and electrophilic addition, and identifying unknown compounds from spectra.
What you need to know
- 2.1 Thermochemistry Standard enthalpy changes of reaction, formation, combustion and neutralisation; Q = mc delta T; Hess's law cycles and average bond enthalpies.
- 2.2 Rates of reaction Collision theory, activation energy and the Boltzmann distribution; effects of concentration, temperature, surface area and catalysts; methods to measure rate from gas volume, mass or colour change.
- 2.3 The wider impact of chemistry Green chemistry principles such as high atom economy, renewable feedstocks and catalysts; the greenhouse effect and climate change; the impact of chemistry on society.
- 2.4 and 2.5 Organic compounds and hydrocarbons IUPAC naming, structural and E/Z isomerism. Alkanes undergo radical substitution with halogens; alkenes undergo electrophilic addition with bromine and hydrogen halides and form addition polymers.
- 2.6 Halogenoalkanes Nucleophilic substitution with hydroxide, cyanide and ammonia; elimination with ethanolic hydroxide; rates linked to C to X bond enthalpy; CFCs and ozone depletion by chlorine radicals.
- 2.7 and 2.8 Alcohols, acids and analysis Oxidation of alcohols with acidified dichromate, dehydration, esterification. Mass spectra, IR absorptions and NMR spectra are used to identify organic compounds.
Common mistakes in AS Component 2: Energy, Rate and Chemistry of Carbon Compounds
- Using the volume of reactants as the mass in Q = mc delta T without adding both volumes when two solutions are mixed.
- Drawing a Boltzmann distribution that meets the x-axis or crosses the original curve twice at the wrong place.
- Writing radical mechanisms without dots, or with H radicals in propagation.
- Confusing aqueous and ethanolic hydroxide conditions for substitution and elimination.
- Claiming CFCs deplete ozone directly. Chlorine radicals formed by UV light catalyse ozone breakdown.
Try three AS Component 2: Energy, Rate and Chemistry of Carbon Compounds exam-style questions
1. 50.0 cm3 of water is heated by burning 0.230 g of ethanol (Mr 46.0). The temperature rises by 28.0 K. Calculate the enthalpy change of combustion of ethanol. (c = 4.18 J g-1 K-1) (3 marks)
Show the mark scheme answer
Q = 50.0 x 4.18 x 28.0 = 5852 J; moles ethanol = 0.230 / 46.0 = 0.00500 mol; delta H = -5.852 / 0.00500 = -1170 kJ mol-1.
2. Write equations to show how chlorine radicals from CFCs catalyse the breakdown of ozone. (2 marks)
Show the mark scheme answer
Cl + O3 gives ClO + O2; ClO + O gives Cl + O2 (chlorine radical regenerated).
3. Explain why the experimental value for the enthalpy of combustion in a simple calorimeter is less exothermic than the data book value. (2 marks)
Show the mark scheme answer
Heat is lost to the surroundings (and to the calorimeter); incomplete combustion of the fuel (or evaporation of fuel), so less energy is measured than is actually released.
AS Component 2: Energy, Rate and Chemistry of Carbon Compounds FAQs
What does Eduqas AS Chemistry Component 2 cover?
It covers thermochemistry, rates of reaction, the wider impact of chemistry, organic naming and isomerism, alkanes, alkenes, halogenoalkanes, alcohols and carboxylic acids, and instrumental analysis.
How do I revise AS Component 2?
Alternate between calculation practice (calorimetry, Hess's law, bond enthalpies) and organic recall, writing out each mechanism and every reagent and condition from memory.
Which mechanisms do I need for AS Component 2?
Learn radical substitution of alkanes, electrophilic addition to alkenes, and nucleophilic substitution of halogenoalkanes, plus the elimination reaction to form alkenes.
