The Exam Vitals

• Duration: 3 Hours (180 minutes).

• Total Marks: 400 Marks.

• Format: You must answer 8 questions in total.

• Mark Allocation: Each question is worth 50 marks. (12.5% of the total grade).

Note: Recent papers (2023–2025) instruct students to "Answer any eight questions." This is a deviation from the traditional pre-2020 rule which required "at least two" from Section A. However, as an expert, I strongly advise attempting at least two, if not all three, Section A questions because they are based on a finite list of mandatory experiments.

Section A: Experimental Chemistry (Questions 1–3)

The Rule: You must answer at least two questions from this section. You may answer all three.

This section tests your knowledge of the 28 mandatory Student Laboratory Experiments. The questions here are highly predictable based on the data in your uploaded files.

• Question 1: Organic Preparation

  • Focus: This is almost exclusively an Organic Chemistry experiment.

  • Recent Trends: Preparation of Ethene (2024, 2022) or Ethyne (2023).

  • What you need: You must be able to draw the diagram, identify the chemicals used (e.g., aluminium oxide vs. calcium carbide), and explain safety precautions.

• Question 2: Volumetric Analysis (Titration)

  • Focus: Acid-Base Titrations.

  • Recent Trends: Hydrochloric Acid (HCl) vs. Sodium Hydroxide (NaOH) is the dominant theme (2025, 2024, 2023, 2022).

  • Marking: Marks are heavily weighted toward the calculation (Molarity, Grams per Litre) and procedure (rinsing the burette/pipette).

• Question 3: The "Variable" Experiment

  • Focus: This rotates between Rates of Reaction, Water Analysis, or testing for Anions.

  • Recent Trends: Rates of Reaction (Oxygen or Hydrogen gas production) is a frequent flyer here.

Section B: General Chemistry & Theory (Questions 4–11)

This section tests your understanding of chemical principles, problem-solving, and applied chemistry.

• Question 4 (Short Questions):

  • Contains 11 or 12 short items (parts a–l), of which you must answer 8.

  • Strategy: This is a "speed run" of the syllabus, covering definitions, trends, and quick calculations. It is often the quickest 50 marks on the paper. You should attempt all questions here

• Question 5 (Atomic Structure):

  • Consistently focuses on the Atom, Electronic Configuration, and the Periodic Table.

  • Includes: History of the atom, s/p/d/f configurations, ionisation energies, and electronegativity trends.

• Question 6 – 9 (Core Topics):

  • These questions rotate through the major syllabus headings:

    • Organic Chemistry: (Reaction schemes, mechanisms, naming).

    • Chemical Equilibrium: (Kc calculations, Le Chatelier's Principle).

    • Acids & Bases: (pH calculations, indicators).

    • Thermochemistry: (Heats of reaction, Hess's Law).

• Question 10 & 11 (The "Split" Questions):

  • These questions contain internal choices (Part A, Part B, and Part C).

  • You typically answer two out of the three parts provided in the question (e.g., answer 10(a) and 10(b)).

  • Options: Part C often covers the "Option" topics (e.g., Atmospheric Chemistry or Industrial Chemistry). If you have studied an Option, this is where it appears.

Use this table to identify which topics appeared in specific questions across recent years. This includes data from standard and deferred sittings.

Time management is the difference between a pass and an honour. Below is the optimal breakdown based on the marks available.

The Chemistry Higher Level paper is 3 hours (180 minutes) long and worth 400 marks. You must answer 8 questions in total.

The Leaving Certificate Chemistry exam is 3 hours (180 minutes) long and marked out of 400 marks.

• You must answer 8 questions in total.

• Each question is worth 50 marks.

• Required: You must answer at least 2 questions from Section A (Experimental) and the remaining 6 from Section B. Alternatively, you can answer 3 from A and 5 from B.

The Golden Rule: 20 Minutes Per Question.

Download official SEC exam papers and our annotated solutions. We have included Deferred Papers from 2022 and 2023. These are official papers that provide excellent, unseen practice material.

2025

• [Download 2025 Paper]
  

2024

• [Download 2024 Paper]
  

2023

• [Download 2023 Paper]

2022

• [Download 2022 Paper]

• [Download 2022 Deferred Paper]

1. Graphing "Dot-to-Dot": In Rate of Reaction questions (Question 3 or Section B), never join the plotted points with straight lines like a dot-to-dot drawing. You must draw a smooth curve or a line of best fit that represents the trend. Also, ensure your axes are labelled with both the variable (e.g., "Time") and the unit (e.g., "seconds").

2. Molarity vs. Grams per Litre: In Titration calculations (Question 2), a common mistake is stopping at the Molarity (moles per litre) when the question asks for concentration in grams per litre. Always check the final unit requested. To convert: Molarity X  Molar Mass = g/L.

3. Organic Nomenclature Precision: In Organic Chemistry (Question 1, 6, or 8), precision is non-negotiable. Writing "Propanol" is often insufficient if the isomer is specific; you must specify Propan-1-ol or Propan-2-ol. Similarly, confusing the suffix "-ane" (alkane) with "-ene" (alkene) will lose you the marks entirely.

4. Imprecise Definitions: When defining terms like "Catalyst" or "Isotope," do not use your own words. Use the exact definitions from the syllabus. For example, an isotope must be defined as atoms of the same element with the "same atomic number but different mass numbers" (or number of neutrons). Vague descriptions like "heavier versions of an atom" are not accepted.

Review the exact history of every question from the last six years of standard sittings. Use this matrix to identify "Anchors" — questions that remain consistent year after year.