Edexcel IAL Chemistry Past Papers & Mark Schemes (YCH11) – Updated 2026
Updated: 2 days ago
Access Edexcel IAL Chemistry (YCH11) past papers and mark schemes for Units 1–6, with worked answers, examiner tips and focused 2026 revision guidance.
Past Papers
Download IAL Chemistry past papers and mark schemes to practice effectively
Examiner Tips
Understand what IAL Chemistry examiners look for and how to earn top marks
Edexcel IAL Chemistry June 2026 Past Papers & Mark Schemes
2026 Edexcel IAL Chemistry (June) | Downloads | |
Unit 1: Structure, Bonding & Introduction to Organic Chemistry (WCH11/01) | ||
Unit 2: Energetics, Kinetics & Organic Chemistry (WCH12/01) | ||
Unit 3: Practical Skills in Chemistry I (WCH13/01) | ||
Unit 4: Rates, Equilibria & Further Organic Chemistry (WCH14/01) | ||
Unit 5: Transition Metals, Organic Nitrogen & Spectroscopy (WCH15/01) | ||
Unit 6: Practical Skills in Chemistry II (WCH16/01) | ||
Edexcel IAL Chemistry June 2026 Variant A Past Papers & Mark Schemes
2026 Edexcel IAL Chemistry Variant A (June) | Downloads | |
Unit 1A: Structure, Bonding & Introduction to Organic Chemistry (WCH11/01A) | ||
Unit 2A: Energetics, Kinetics & Organic Chemistry (WCH12/01A) | ||
Unit 3A: Practical Skills in Chemistry I (WCH13/01A) | ||
Unit 4A: Rates, Equilibria & Further Organic Chemistry (WCH14/01A) | ||
Unit 5A: Transition Metals, Organic Nitrogen & Spectroscopy (WCH15/01A) | ||
Unit 6A: Practical Skills in Chemistry II (WCH16/01A) | ||
Edexcel IAL Chemistry January 2026 Past Papers & Mark Schemes
2026 Edexcel IAL Chemistry (January) | Downloads | |
Unit 1: Structure, Bonding & Introduction to Organic Chemistry (WCH11/01) | ||
Unit 2: Energetics, Kinetics & Organic Chemistry (WCH12/01) | ||
Unit 3: Practical Skills in Chemistry I (WCH13/01) | ||
Unit 4: Rates, Equilibria & Further Organic Chemistry (WCH14/01) | ||
Unit 5: Transition Metals, Organic Nitrogen & Spectroscopy (WCH15/01) | ||
Unit 6: Practical Skills in Chemistry II (WCH16/01) | ||
Edexcel IAL Chemistry January 2026 Variant A Past Papers & Mark Schemes
2026 Edexcel IAL Chemistry (January Variant A) | Downloads | |
Unit 1: Structure, Bonding & Introduction to Organic Chemistry (WCH11/01) | ||
Unit 2: Energetics, Kinetics & Organic Chemistry (WCH12/01) | ||
Unit 3: Practical Skills in Chemistry I (WCH13/01) | ||
Unit 4: Rates, Equilibria & Further Organic Chemistry (WCH14/01) | ||
Unit 5: Transition Metals, Organic Nitrogen & Spectroscopy (WCH15/01) | ||
Unit 6: Practical Skills in Chemistry II (WCH16/01) | ||
Edexcel IAL Chemistry June 2025 Past Papers & Mark Schemes
2025 Edexcel IAL Chemistry (June) | Downloads | |
Unit 1: Structure, Bonding & Introduction to Organic Chemistry (WCH11/01) | ||
Unit 2: Energetics, Kinetics & Organic Chemistry (WCH12/01) | ||
Unit 3: Practical Skills in Chemistry I (WCH13/01) | ||
Unit 4: Rates, Equilibria & Further Organic Chemistry (WCH14/01) | ||
Unit 5: Transition Metals, Organic Nitrogen & Spectroscopy (WCH15/01) | ||
Unit 6: Practical Skills in Chemistry II (WCH16/01) | ||
Edexcel IAL Chemistry June 2024 Past Papers & Mark Schemes
2024 Edexcel IAL Chemistry (June) | Downloads | |
Unit 1: Structure, Bonding & Introduction to Organic Chemistry (WCH11/01) | ||
Unit 2: Energetics, Kinetics & Organic Chemistry (WCH12/01) | ||
Unit 3: Practical Skills in Chemistry I (WCH13/01) | ||
Unit 4: Rates, Equilibria & Further Organic Chemistry (WCH14/01) | ||
Unit 5: Transition Metals, Organic Nitrogen & Spectroscopy (WCH15/01) | ||
Unit 6: Practical Skills in Chemistry II (WCH16/01) | ||
Edexcel IAL Chemistry June 2023 Past Papers & Mark Schemes
2023 Edexcel IAL Chemistry (June) | Downloads | |
Unit 1: Structure, Bonding & Introduction to Organic Chemistry (WCH11/01) | ||
Unit 2: Energetics, Kinetics & Organic Chemistry (WCH12/01) | ||
Unit 3: Practical Skills in Chemistry I (WCH13/01) | ||
Unit 4: Rates, Equilibria & Further Organic Chemistry (WCH14/01) | ||
Unit 5: Transition Metals, Organic Nitrogen & Spectroscopy (WCH15/01) | ||
Unit 6: Practical Skills in Chemistry II (WCH16/01) | ||
Edexcel IAL Chemistry June 2022 Past Papers & Mark Schemes
2022 Edexcel IAL Chemistry (June) | Downloads | |
Unit 1: Structure, Bonding & Introduction to Organic Chemistry (WCH11/01) | ||
Unit 2: Energetics, Kinetics & Organic Chemistry (WCH12/01) | ||
Unit 3: Practical Skills in Chemistry I (WCH13/01) | ||
Unit 4: Rates, Equilibria & Further Organic Chemistry (WCH14/01) | ||
Unit 5: Transition Metals, Organic Nitrogen & Spectroscopy (WCH15/01) | ||
Unit 6: Practical Skills in Chemistry II (WCH16/01) | ||
Edexcel IAL Chemistry June 2021 Past Papers & Mark Schemes
2021 Edexcel IAL Chemistry (June) | Downloads | |
Unit 1: Structure, Bonding & Introduction to Organic Chemistry (WCH11/01) | ||
Unit 2: Energetics, Kinetics & Organic Chemistry (WCH12/01) | ||
Unit 4: Rates, Equilibria & Further Organic Chemistry (WCH14/01) | ||
Unit 5: Transition Metals, Organic Nitrogen & Spectroscopy (WCH15/01) | ||
Unit 6: Practical Skills in Chemistry II (WCH16/01) | ||
Tip 1: The ideal gas equation only works if every unit is correct before you substitute
This is one of the most reliably mark-losing mistakes on the paper, and it is entirely a unit problem rather than a conceptual one. Students who understand pV = nRT perfectly still drop marks here because they substitute values without converting them first.
The gas constant R = 8.31 J K⁻¹ mol⁻¹ dictates the units every other quantity must be in. There is no flexibility — if your units do not match R, the equation produces a wrong answer.
The three conversions to make automatic are these.
Volume must be in m³. If your volume is in dm³, divide by 1000. If it is in cm³, divide by 1,000,000. A volume of 250 cm³ is 0.000250 m³. A volume of 2.4 dm³ is 0.0024 m³.
Pressure must be in Pa. If your pressure is given in kPa, multiply by 1000. 101 kPa becomes 101,000 Pa.
Temperature must be in Kelvin. Add 273 to any Celsius value. 25°C becomes 298 K. This one is quick but consistently forgotten under pressure.
The strategy that prevents most errors: rearrange the equation for the unknown quantity before substituting any numbers at all. Write V = nRT ÷ p, or n = pV ÷ RT, or whichever form you need — then convert all your units — then substitute. Doing the algebra and the unit conversion simultaneously is where mistakes happen. Separate the two steps.
Tip 2: State symbols are part of the equation — treat them as such
State symbols are not a finishing touch added after an equation is written. They are part of the equation, and in questions that require them, an equation without them is an incomplete answer.
The two contexts where omissions are most costly are these. In ionisation energy equations, every species must be shown in the gaseous state. The atom losing the electron must be written as X(g), and the resulting ion must be written as X⁺(g). Writing the equation correctly but without state symbols, or assuming (g) is implied and therefore unnecessary to write, will lose the mark. The equation must explicitly show both species as gaseous — that is part of the definition of ionisation energy.
In combustion equations and ionic equations, the appropriate state symbol for each substance must reflect its actual physical state under the conditions described. Heptane is a liquid fuel — it is (l), not (g). An insoluble product formed in a precipitation reaction is (s), not (aq). Using (aq) for a substance that does not dissolve, or (l) for something that is a gas under reaction conditions, is an error that marks cannot be awarded for regardless of whether the rest of the equation is balanced correctly.
A practical technique: when reading through the question before you begin, actively look for the instruction "include state symbols" or "write an equation with state symbols." The moment you see it, underline it or put a box around it. That physical mark on the page is a reminder that catches the omission during your check at the end, when time pressure makes it easy to overlook.
Tip 3: Learn definitions word for word — everyday language is not enough
In Chemistry, a definition is either correct or it is not. Unlike extended answer questions where partial credit is available, definition marks are typically binary — you have the required components or you do not. Paraphrasing a definition in language that feels close enough is one of the most consistent ways to lose straightforward marks.
The two definitions that cause the most problems are worth addressing precisely
.
Isotopes are frequently defined as "elements with the same number of protons but different numbers of neutrons." That definition contains a meaningful error — isotopes are not elements, they are atoms. The correct definition is: "atoms of the same element with the same number of protons but different numbers of neutrons." The distinction matters because two different elements can share the same mass number without being isotopes of each other. The word "atoms" is not interchangeable with "elements" here.
Relative atomic mass is another definition where imprecision is penalised. Saying it is "the average mass of an atom compared to carbon-12" misses two essential components. First, it must be the weighted mean mass — not a simple average — because the calculation accounts for the relative abundance of each isotope. Second, the reference point is specifically one-twelfth of the mass of one atom of carbon-12, not carbon-12 as a whole. The full definition to memorise is: "the weighted mean mass of an atom of an element compared to one-twelfth of the mass of one atom of carbon-12."
The most reliable approach is to open the specification, find the definitions listed there, and memorise them exactly as written — same words, same order. When writing them in an exam, do not paraphrase and do not trust that something similar will be credited. Write the specification definition.
Tip 4: Mechanism marks are lost to imprecision — every arrow must be exact
Reaction mechanisms are one of the highest-discriminating areas of the paper, meaning they separate the top grades from the middle grades more reliably than almost any other topic. The chemistry itself is not beyond most students — it is the execution that costs marks.
Every curly arrow in a mechanism communicates a specific electron movement, and the examiner reads it precisely. An arrow that begins from the wrong place or points to the wrong destination is not a minor slip — it is a mechanistic error.
The rules for curly arrows are absolute. An arrow must begin from the source of the electron pair — either the centre of a bond that is breaking, or directly on a lone pair. Beginning an arrow from an atom itself, rather than from its lone pair, is wrong. An arrow must end at the destination of those electrons — either the atom forming a new bond with them, or the space between two atoms where a new bond is being created. Vague arrows that point in approximately the right direction without a clear origin and destination will not be credited.
For electrophilic addition and similar mechanisms, dipole charges must be shown. The δ+ on the electrophile and δ- on the more electronegative atom are not optional annotations — they justify the direction of electron movement and are frequently separate marking points. If the charges are absent, the mechanism is incomplete.
For free-radical substitution, radicals must be shown with a single dot representing the unpaired electron. Writing Cl when you mean Cl• is a different species entirely. Every radical in every step of the mechanism must carry the dot — including intermediates and the radical produced in each propagation step. Check each species individually before moving on.
Tip 5: Do not round until the very last step
This is the same discipline required across all calculation-heavy topics in Chemistry, and it is worth reinforcing because the consequences of getting it wrong are silent — the method looks correct, the working looks tidy, and the final answer is just far enough outside the acceptable range to lose the mark.
The problem compounds across steps. Round a value to two significant figures at stage two of a four-stage calculation, and that approximation carries forward and distorts every subsequent result. By the final answer, the accumulated error can be large enough to fall outside the mark scheme tolerance, even though every individual step was methodologically correct.
The rule is non-negotiable: leave every intermediate value in your calculator exactly as it appears and use that full value in the next step. Round once, at the end, to the precision the question specifies. If the question asks for three significant figures, give three significant figures in the final answer — not two, not four. If no specific precision is stated, match the least number of significant figures present in the data provided, which at A Level is typically three.
Tip 6: Two structures with the same IUPAC name are the same molecule
Isomer questions require you to produce genuinely distinct structures, and the most reliable way to confirm that yours are distinct is to name each one using IUPAC rules as you draw it. If two of your drawings produce the same name, they are the same compound drawn in a different orientation — and a different orientation is not an isomer.
This is the specific error that recurs most: a structure is drawn, then redrawn flipped or rotated, and counted as a second isomer. Rotating or reflecting a molecule does not change its connectivity, and connectivity is what determines structure. Two structures are only different isomers if their IUPAC names are different.
For alkenes specifically, always check whether E/Z isomerism is possible once you have drawn your structural isomers. If a double bond has two different groups on each carbon, restricted rotation means the E and Z forms are distinct compounds and both count as valid isomers. Missing E/Z pairs is a consistent source of incomplete answers in this question type.
Tip 7: Identify the bond type before you draw anything
Dot-and-cross diagrams are examined regularly and marked precisely, which makes the initial identification of bond type — ionic or covalent — the most important step of the entire question. An otherwise well-drawn diagram that shows covalent bonding for an ionic compound, or omits lone pairs from a covalent molecule, cannot be credited correctly.
The identification is straightforward: metal combined with non-metal means ionic bonding — electrons are transferred, ions are formed, and the diagram shows complete electron shells on separate charged species with square brackets and charges. Non-metal combined with non-metal means covalent bonding — electrons are shared, and the diagram shows overlapping shells with electron pairs in the overlap region.
In covalent diagrams, lone pairs must be shown on all outer atoms unless the question explicitly states otherwise. This is not optional. Lone pairs affect molecular geometry — they are the basis of VSEPR theory — and their absence makes the diagram both incomplete and chemically misleading. Check every atom in your diagram individually: does it have the correct total number of electrons in its outer shell, including both bonding pairs and lone pairs?
Tip 8: Count every carbon deliberately — do not trust a quick visual scan
Skeletal formulae and cyclic structures are efficient ways of representing organic molecules, but they require active interpretation rather than passive reading. Every line junction and every line endpoint represents a carbon atom, and each of those carbons must have exactly four bonds in total — a combination of the bonds shown in the structure and the implied hydrogen atoms that make up the remainder.
The error that recurs most often in these questions is at double bonds and ring junctions, where the carbon is already involved in more bonds than a chain carbon and therefore carries fewer hydrogens. A carbon in a C=C double bond already has three bonds accounted for if it is also part of a chain — meaning it carries only one hydrogen. A carbon at a ring junction may have two ring bonds and no hydrogens at all. Treating these carbons as if they carry the default number of hydrogens produces an incorrect molecular formula.
The technique that prevents this reliably is physical rather than mental: take your pen and place a dot on or number every carbon atom in the structure before you begin counting. Then work through each one individually, count the bonds already shown, and calculate the hydrogens needed to reach four. A visual scan of a complex cyclic structure is not sufficient — the dots or numbers force you to account for every atom without skipping.
Has the Edexcel IAL Chemistry syllabus changed for the 2027 examinations?
No. The current specification (first teaching 2018, codes WCH11 for AS and WCH14/15/16 for A2) remains valid through 2027, and no changes have been announced as of mid-2026. The modular six-unit structure continues unchanged, with all units available across the January, June, and October series.
A few details worth noting for 2027 candidates:
Equation sheets will continue to be provided in the exam, as confirmed by Pearson for the 2025–2027 series.
Practical assessment for IAL students remains through the written practical papers — Units 3 and 6 — rather than the Practical Endorsement used in the UK domestic A Level.
The best places to monitor are Pearson's Science Subject Update page and ExamWizard for any revised specimen papers or marking scheme tweaks. These minor issues typically clarify wording rather than change content, but they're worth staying on top of.
When are the Edexcel IAL Chemistry exams held, and what are the specific dates for 2026–2027?
October/November 2026: The series opens October 8, 2026, with Chemistry units typically falling in the second and third weeks of October. Results released mid-January 2027.
January 2027 (confirmed):
Unit | Title | Date | Session |
Unit 1 | Structure, Bonding & Organic Chem I | Mon, 11 Jan | Morning |
Unit 2 | Energetics, Group Chem & Alcohols | Tue, 12 Jan | Afternoon |
Unit 3 | Practical Skills in Chemistry I | Thu, 14 Jan | Afternoon |
Unit 4 | Rates, Equilibria & Organic Chem II | Mon, 18 Jan | Afternoon |
Unit 5 | Transition Metals & Organic Chem III | Thu, 21 Jan | Morning |
Unit 6 | Practical Skills in Chemistry II | Mon, 25 Jan | Morning |
June 2027 (provisional):
Unit | Title | Date | Session |
Unit 1 | Structure, Bonding & Organic Chem I | Wed, 5 May | Afternoon |
Unit 2 | Energetics, Group Chem & Alcohols | Mon, 10 May | Afternoon |
Unit 3 | Practical Skills in Chemistry I | Fri, 21 May | Afternoon |
Unit 4 | Rates, Equilibria & Organic Chem II | Wed, 26 May | Afternoon |
Unit 5 | Transition Metals & Organic Chem III | Tue, 8 Jun | Morning |
Unit 6 | Practical Skills in Chemistry II | Mon, 14 Jun | Morning |
Key registration deadlines:
January 2027: Register by mid-October 2026 to avoid late fees
June 2027: Normal entry deadline is March 21, 2027
October 2027 dates will be released in early 2027, following the same pattern of opening in the first or second week of October.
How much harder is Edexcel IAL Chemistry compared to IGCSE/O Level?
The jump is steep — IGCSE gives you the vocabulary, but IAL demands the full grammar and logic of the subject.
Four things change dramatically:
IGCSE simplifications get dismantled: Electron shells become s, p, d, f orbitals; basic bonding expands into VSEPR theory, molecular geometry, and intermolecular forces. You're not just building on prior knowledge — you're partly replacing it.
Mathematics becomes central: IGCSE maths in Chemistry is mostly mole calculations. IAL introduces rate constants, equilibrium constants (Kc and Kp), logarithmic pH calculations, and Born-Haber cycles. Units 2 and 4 in particular can feel like a second Maths course.
Content volume roughly triples: Organic Chemistry alone expands from a few functional groups to dozens of reaction mechanisms (Nucleophilic Substitution, Electrophilic Addition, etc.), each with specific reagents and precise conditions. Inorganic trends move beyond surface observations to explanations rooted in ionisation energy and shielding effects.
Marking schemes are unforgiving: Missing a specific keyword — such as "electrostatic attraction between oppositely charged ions" — loses the mark entirely. Questions rarely test simple recall; you're regularly given unfamiliar molecules or data and asked to apply your knowledge on the spot.
Feature | IGCSE / O Level | |
|---|---|---|
Focus | Recall & basic understanding | Application & deep reasoning |
Maths | Basic ratios and percentages | Logs, multi-step algebra, graphs |
Practical | Mostly descriptive | Error analysis & uncertainty |
Study style | Can be crammed | Requires consistent daily revision |
If IGCSE Chemistry felt easy, don't let that create complacency — but do use it as a foundation. Unit 1 (Structure & Bonding) is the most important bridge from IGCSE, so getting that solid early makes everything else significantly more manageable.
