June 2016 Edexcel A Level Chemistry paper-1-as Mark Scheme

June 2016 Edexcel A Level Chemistry · paper-1-as · Mark Scheme

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June-2016-MS---Paper-1-Edexcel-Chemistry-AS-level.pdf

June 2016 Edexcel A Level Chemistry paper-1-as Mark Scheme

This is the official Edexcel mark scheme for Chemistry Mark Scheme paper-1-as from the June 2016 session. Mark schemes show exactly how each mark is awarded, including acceptable alternative answers, required key terms, and common errors that lose marks. Edexcel mark schemes use notation like "allow," "accept," and "do not credit" to define the boundary between full marks and zero.

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This mark scheme corresponds to June-2016-QP---Paper-1-Edexcel-Chemistry-AS-level. For maximum revision benefit, attempt the question paper under strict exam conditions first, then use this mark scheme to self-assess. Pay attention to the marking notation: "allow" means an alternative is accepted, "do not credit" means a specific phrasing is rejected even if technically correct, and "ORA" (or reverse argument) means the mark can also be earned with the opposite reasoning.

Edexcel mark schemes reward precise language. For Chemistry, look for keywords the examiner requires — definitions must include specific terms (e.g., "per unit mass," "resultant"), and calculations must show working even if the final answer is correct. Understanding mark scheme conventions helps you write answers that hit every marking point, not just the general idea.

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Same paper, other years

Edexcel Chemistry Mark Scheme paper-1-as from other exam series — practise the same paper across the years, then mark each one against its mark scheme.

MSJune 2024 MSJune 2023 MSJune 2022 MSJune 2021 MSJune 2020 MSJune 2019 MSJune 2018 MSJune 2017

Examiner Insights — Edexcel Chemistry

Based on analysis of 6 official Pearson Edexcel documents (2023–2024).

Imprecise curly arrows in organic mechanisms

“Just over 40% of candidates answered this correctly, suggesting that the understanding of curly arrows is not as well embedded as the recall of curly arrows in familiar mechanisms.”— 9CH0 Paper 2, June 2024

How to fix: Every curly arrow has TWO rules: (1) the tail must start on a lone pair OR the centre of a bond — never on an atom; (2) the head must point to the exact atom or bond receiving the electron pair. For electrophilic substitution on a benzene ring, the first arrow must originate from inside the delocalised ring (not from a C–H bond). Show δ⁺/δ⁻ on every polar bond. Show all lone pairs and charges before drawing arrows. Do not include two-headed arrows in initiation steps of free-radical mechanisms.

View full exam guide for Chemistry →