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.
- 159questions
- 10topics
- 3exams covered
- Freeno plans or paywalls
Chemistry in the United States
Practise chemistry with the exams you can take in the United States.
Where do you want to start?
- 100 questions · 6 topicsPhysical chemistryThe mole, solutions, gases, equilibrium and rates: the calculations of chemistry.Biochemistry and Molecular Biology · Structure, Reactions and Equilibrium · States of matter
- 54 questions · 2 topicsOrganic chemistryCarbon compounds, their groups and reactions.General and Organic Chemistry · Organic chemistry basics
- 5 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.
General and Organic Chemistry
49 questions across 1 exam
Biochemistry and Molecular Biology
41 questions across 1 exam
Structure, Reactions and Equilibrium
26 questions across 1 exam
States of matter
16 questions across 1 exam
Mole concept
9 questions across 1 exam
Equilibrium and kinetics
5 questions across 1 exam
Organic chemistry basics
5 questions across 1 exam
Redox reactions
3 questions across 1 exam
Real questions, worked answers.
- General and Organic Chemistry · MCAT (Medical College Admission Test)What is the pH of a 0.01 M solution of the strong acid HCl?See the answer and explanation →
- Biochemistry and Molecular Biology · MCAT (Medical College Admission Test)Which amino acid has no stereocenter and is therefore achiral?See the answer and explanation →
- Structure, Reactions and Equilibrium · AP (Advanced Placement)How many moles of water are in 36 grams of H2O? (molar mass 18 g/mol)See the answer and explanation →
Practise it for real.
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 MCAT (Medical College Admission Test), IB Diploma, AP (Advanced Placement). There are 159 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.