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.
- 208questions
- 12topics
- 2exams covered
- Freeno plans or paywalls
Chemistry in Bulgaria
Practise chemistry with the exams you can take in Bulgaria.
Where do you want to start?
- 98 questions · 6 topicsPhysical chemistryThe mole, solutions, gases, equilibrium and rates: the calculations of chemistry.Chemical Thermodynamics, Kinetics, and Equilibrium · Biological Chemistry and Macromolecules · States of matter
- 70 questions · 4 topicsAtoms and bondingAtomic structure, the periodic table and how atoms bond.Chemical Bonding and States of Matter · Atomic Structure and Periodic Properties · Periodic properties
- 40 questions · 2 topicsOrganic chemistryCarbon compounds, their groups and reactions.Hydrocarbons and Functional Groups · Organic chemistry basics
The most practised topics.
Each topic has its own list of questions with explanations. Pick the exam you are preparing for.
Chemical Thermodynamics, Kinetics, and Equilibrium
35 questions across 1 exam
Chemical Bonding and States of Matter
35 questions across 1 exam
Hydrocarbons and Functional Groups
35 questions across 1 exam
Biological Chemistry and Macromolecules
30 questions across 1 exam
Atomic Structure and Periodic Properties
30 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
Real questions, worked answers.
- Chemical Thermodynamics, Kinetics, and Equilibrium · Medical University Entrance Examination (Bulgaria)What thermodynamic criterion determines whether a chemical process is spontaneous at constant temperature and pressure?See the answer and explanation →
- Chemical Bonding and States of Matter · Medical University Entrance Examination (Bulgaria)What is the molecular geometry and electron-pair geometry of the water molecule (H2O)?See the answer and explanation →
- Hydrocarbons and Functional Groups · Medical University Entrance Examination (Bulgaria)What is the IUPAC name of the branched alkane with structural formula (CH3)2CH-CH2-CH(CH3)2?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 Medical University Entrance Examination (Bulgaria), IB Diploma. There are 208 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.