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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.

Start with Physical chemistryBrowse mock tests
  • 46
    questions
  • 3
    topics
  • 2
    exams covered
  • Free
    no plans or paywalls

Chemistry in Korea, Republic of

Practise chemistry with the exams you can take in Korea, Republic of.

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Real questions, worked answers.

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Chemistry in your exam.

AP (Advanced Placement)26CSAT Suneung20

How to practise chemistry.

  1. 1

    Balance the equation first

    Most mole and mass questions fall apart when the equation is not balanced. Do it before any numbers.

  2. 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. 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 AP (Advanced Placement), CSAT Suneung. There are 46 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.

Start with one question.

Physical chemistry practiceBrowse mock tests