Subjects
Chemistry practice, free.
Solutions, gases, the mole, equilibrium, atoms and bonding, from school and entrance exams. Every question has an explanation, and the tests are timed like the real thing.
- 132questions
- 7topics
- 3exams covered
- Freeno plans or paywalls
Chemistry in Singapore
Practise chemistry with the exams you can take in Singapore.
Where do you want to start?
- 102 questions · 4 topicsPhysical chemistryThe mole, solutions, gases, equilibrium and rates: the calculations of chemistry.States of matter · Mole concept · Equilibrium and kinetics
- 15 questions · 1 topicsOrganic chemistryCarbon compounds, their groups and reactions.Organic chemistry basics
- 15 questions · 2 topicsAtoms and bondingAtomic structure, the periodic table and how atoms bond.Periodic properties · Chemical bonding
The most practised topics.
Each topic has its own list of questions with explanations. Pick the exam you are preparing for.
States of matter
51 questions across 3 exams
Mole concept
27 questions across 3 exams
Equilibrium and kinetics
15 questions across 3 exams
Organic chemistry basics
15 questions across 3 exams
Redox reactions
9 questions across 3 exams
Periodic properties
9 questions across 3 exams
Chemical bonding
6 questions across 3 exams
Real questions, worked answers.
- States of matter · Cambridge IGCSEA gas at 4 atm occupies 6 L. At constant temperature, what is its pressure (in atm) when the volume is compressed to 3 L?See the answer and explanation →
- Mole concept · Cambridge IGCSEWhat is the molar mass (in g/mol) of H 2SO 4? (H = 1, C = 12, N = 14, O = 16, Na = 23, S = 32, Ca = 40)See the answer and explanation →
- Equilibrium and kinetics · Cambridge IGCSEFor N 2 + 3 H 2 rightleftharpoons 2 NH 3, increasing the pressure shifts the equilibriumSee the answer and explanation →
Chemistry in your exam.
How to practise chemistry.
- 1
Balance the equation first
Most mole and mass questions fall apart when the equation is not balanced. Do it before any numbers.
- 2
Write the units and the formula you use
Moles, grams, litres and concentration are easy to mix up. Units on every line keep you honest.
- 3
Learn trends as patterns
Periodic trends are a few rules, not a long list. Learn why they go up or down across a period and down a group.
- 4
Do a rough check
Ask whether the answer is the right size. A negative concentration or a mass larger than you started with means a slip.
- 5
Redo your mistakes after a week
Repeat the questions you got wrong after a few days. That is when a method either sticks or fades.
Questions, answered.
- Is the chemistry practice really free?
- Yes. Every question, explanation, mock test and flashcard deck is free, with no plans or paywalls.
- Which exams does it cover?
- Chemistry questions from Cambridge IGCSE, Cambridge A-Level, IB Diploma. There are 132 chemistry questions on this page's list today.
- Does every question have an explanation?
- Yes. Each question has an explanation with the working or the key idea, and you can open any question on its own page.
- Can I take a timed test?
- Yes. The mock tests below run on a real timer and show a full review with explanations at the end.