Q1 · Difficulty 1/3
The horizontal rows of the Periodic Table are called:
- groups
- periods
- families
- blocks
Show answer & explanation
✓ Answer: B — periods
Horizontal rows are called periods.
CXC · CSEC · Chemistry
Free CXC CSEC Chemistry
Practice Paper
8 mixed-difficulty practice questions in the style of real CXC CSEC papers — answers, mark-scheme-style explanations, and the official exam structure all on one page.
Take a Mini Mock →What the real CXC CSEC Chemistry paper looks like
Paper 1 (Section A)
60 multiple-choice questions, 1 mark each. 75 minutes. Tests knowledge across the whole syllabus.
Paper 2
Structured short-answer + 1 extended response question. Section A is compulsory; Section B has a choice. Approximately 2 hours 10 minutes.
School-Based Assessment (SBA)
Coursework component graded by the teacher, externally moderated. Worth ~20-30% of the final grade depending on subject.
Total exam time: ~3.5 hours across Paper 1 and Paper 2 sittings.
Grading: Grades: I (highest) to VI (lowest). A grade of III or above is typically required for further study.
Grading: Grades: I (highest) to VI (lowest). A grade of III or above is typically required for further study.
Mini practice paper: 8 questions
Mixed-difficulty questions from across the Chemistry syllabus. Tap "Show answer" after each to check yourself.
Q2 · Difficulty 1/3
In Trinidad, rum is produced by fermenting molasses from sugar cane and then distilling the product. The main alcohol present in rum is ethanol. Which functional group is present in ethanol?
- Carboxyl
- Hydroxyl
- Amino
- Carbonyl
Show answer & explanation
✓ Answer: B — Hydroxyl
Award 1 mark for identifying the –OH group as the hydroxyl functional group present in all alcohols including ethanol. A is incorrect because carboxyl (–COOH) is found in carboxylic acids. C is incorrect because amino (–NH₂) is found in amines and amino acids. D is incorrect because carbonyl (C=O) is found in aldehydes and ketones.
Q3 · Difficulty 1/3
Which element is a Group I alkali metal?
- sodium
- chlorine
- neon
- iron
Show answer & explanation
✓ Answer: A — sodium
Sodium is a Group I alkali metal.
Q4 · Difficulty 1/3
What products are formed from the complete combustion of a hydrocarbon?
- Carbon dioxide and water
- Carbon monoxide and hydrogen
- Soot and steam
- Carbon and water
Show answer & explanation
✓ Answer: A — Carbon dioxide and water
Complete combustion (plenty of oxygen): hydrocarbon + O₂ → CO₂ + H₂O. Incomplete combustion produces carbon monoxide and/or soot.
Q5 · Difficulty 1/3
A liquid or solution that conducts electricity and is decomposed by it is called an:
- insulator
- indicator
- alloy
- electrolyte
Show answer & explanation
✓ Answer: D — electrolyte
An electrolyte is an ionic substance (molten or in solution) that conducts and is broken down by electricity.
Q6 · Difficulty 1/3
The elements found in the central block of the Periodic Table are the:
- halogens
- alkali metals
- transition metals
- noble gases
Show answer & explanation
✓ Answer: C — transition metals
The transition metals (such as iron, copper, zinc) occupy the central block.
Q7 · Difficulty 1/3
What is the OILRIG mnemonic for electrolysis?
- Oxidation Is Loss of electrons, Reduction Is Gain of electrons
- Oxidation Is Lowering of charge, Reduction Is Gaining protons
- Oxygen Is Lost at the cathode, Reduction Is Gas at the anode
- Oxidation Is Loss of oxygen, Reduction Is Gain of hydrogen
Show answer & explanation
✓ Answer: A — Oxidation Is Loss of electrons, Reduction Is Gain of electrons
Award 1 mark. At the anode ions lose electrons (oxidation); at the cathode ions gain electrons (reduction). The other versions confuse electrons with oxygen, hydrogen or protons.
Q8 · Difficulty 1/3
A student in a Barbados laboratory heated ethanoic acid with propanol in the presence of concentrated sulfuric acid. Which type of organic compound was formed?
- An alkene
- An alcohol
- An ester
- A ketone
Show answer & explanation
✓ Answer: C — An ester
Award 1 mark for correctly identifying that a carboxylic acid reacting with an alcohol in the presence of concentrated sulfuric acid produces an ester through esterification. B is incorrect because an alcohol is a reactant, not a product. D is incorrect because ketones are formed by oxidation of secondary alcohols. A is incorrect because alkenes are formed by dehydration of alcohols, not esterification.
Build a 30-question timed mock →
Free account · Instant marking
CXC CSEC Chemistry FAQ
What does the CXC CSEC Chemistry exam look like?
The CXC CSEC Chemistry exam is structured across 3 components. Paper 1 (Section A): 60 multiple-choice questions, 1 mark each. 75 minutes. Tests knowledge across the whole syllabus. Paper 2: Structured short-answer + 1 extended response question. Section A is compulsory; Section B has a choice. Approximately 2 hours 10 minutes. School-Based Assessment (SBA): Coursework component graded by the teacher, externally moderated. Worth ~20-30% of the final grade depending on subject. Total exam time: ~3.5 hours across Paper 1 and Paper 2 sittings.
Can I download a free CXC CSEC Chemistry past paper?
Real CXC past papers are published directly by CXC on their official website. Kramizo doesn't redistribute copyrighted past papers, but we do generate free AI-written practice papers in the exact same style — same command words, same difficulty tier, same mark conventions. Use this practice paper as warm-up, then time yourself on official past papers before exam day.
How is CXC CSEC Chemistry graded?
Grades: I (highest) to VI (lowest). A grade of III or above is typically required for further study. Kramizo's practice questions are tagged with difficulty 1-3 mapping roughly to the lower, middle, and top grade boundaries you'll encounter in the real exam.