Free IGCSE Chemistry practice
IGCSE Chemistry questions with answers Free IGCSE Chemistry practice questions with full worked solutions and mark schemes, written by IGCSE tutors for Malaysian students in Year 7 to Year 11. Each question shows the answer, the method to get it right, the mark scheme and the common mistake to avoid.
8 worked examples below. Covers atomic structure, bonding, acids and bases, and organic chemistry.
Worked Chemistry questions Chemistry Year 7 States of matter Easy 1 mark
1. The diagram shows particles in three states. Which box, A, B or C, shows a gas?
A B C
The method
Gas particles are far apart and spread out.
Worked solution
Box C shows widely spaced particles, which is a gas.
Common mistake
Choosing A, the closely packed solid.
Exam tip
Solids are packed, liquids are close but free, gases are spread out.
Chemistry Year 8 Atoms Easy 1 mark
2. Which particle in an atom has a negative charge?
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A Electroncorrect B ProtonC NeutronD NucleusThe method
Recall the three subatomic particles and their charges.
Worked solution
The electron has a negative charge, while protons are positive and neutrons neutral.
Mark scheme
1 mark for Electron.
Common mistake
Choosing the proton, which is positive.
Exam tip
Protons positive, neutrons neutral, electrons negative.
Chemistry Year 9 Atomic structure Medium 2 marks
3. The diagram shows the electron shells of an atom with arrangement 2, 8, 1. Which group of the periodic table is it in?
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A Group 1correct B Group 2C Group 7D Group 8The method
The number of electrons in the outer shell gives the group number.
Worked solution
The outer shell holds 1 electron, so the element is in Group 1.
Mark scheme
1 mark for Group 1.
Common mistake
Counting all electrons instead of just the outer shell.
Exam tip
Outer-shell electrons equal the group number for the main groups.
Chemistry Year 10 Atomic structure Medium 1 mark
4. The diagram shows an atom with shells 2, 8, 8. How many electrons are in its outer shell?
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Answer: 8
The method
Count only the electrons in the outermost ring.
Worked solution
The outer shell shows 8 electrons.
Common mistake
Counting an inner shell by mistake.
Exam tip
A full outer shell of 8 makes an element unreactive.
Chemistry Year 11 Electrolysis Hard 2 marks
5. During electrolysis, to which electrode do positive ions move?
Answer: negative electrode
The method
Opposite charges attract during electrolysis.
Worked solution
Positive ions move to the negative electrode, the cathode, because opposite charges attract.
Mark scheme
1 mark for negative electrode, 1 mark for cathode or attraction idea.
Common mistake
Sending positive ions to the positive electrode.
Exam tip
Positive ions go to the negative cathode. Opposites attract.
Chemistry Year 9 Bonding Hard 2 marks
6. Describe what happens to electrons when a metal reacts with a non-metal to form an ionic bond.
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Answer: metal gives electrons
The method
Think about which atom loses and which gains electrons.
Worked solution
The metal atom gives electrons to the non-metal, forming positive and negative ions that attract each other.
Mark scheme
1 mark for transfer of electrons, 1 mark for forming oppositely charged ions.
Common mistake
Saying electrons are shared, which is covalent bonding.
Exam tip
Ionic bonding transfers electrons. Covalent bonding shares them.
Chemistry Year 10 Bonding Hard 2 marks
7. The diagram shows two atoms sharing a pair of electrons in the overlap. What type of bond is this?
X Y
A Covalentcorrect B IonicC MetallicD MagneticThe method
Sharing electrons is the key feature of one bond type.
Worked solution
Shared electrons between two atoms show a covalent bond.
Mark scheme
1 mark for covalent.
Common mistake
Calling shared electrons ionic.
Exam tip
Sharing is covalent. Transfer is ionic.
Chemistry Year 10 Stoichiometry Hard 2 marks
8. What is the relative formula mass of water, H2O? Use H = 1 and O = 16.
Answer: 18
The method
Add the masses of all atoms in the formula.
Worked solution
Two hydrogens at 1 plus one oxygen at 16 gives 2 + 16 = 18.
Mark scheme
1 mark for 2 + 16, 1 mark for 18.
Common mistake
Forgetting there are two hydrogen atoms.
Exam tip
Multiply each atom's mass by how many there are, then add.
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Open the live dashboard demo More IGCSE practice questions IGCSE Chemistry questions: FAQs Are these IGCSE Chemistry questions free? Yes. Every question on this page is free to read, with the full answer, worked solution and mark scheme shown. For unlimited practice with instant marking, you can try the live Studywise dashboard, also free, with no sign up.
Do the questions follow the Cambridge IGCSE syllabus? Yes. The questions are written by IGCSE tutors and follow the Cambridge IGCSE Chemistry syllabus, covering atomic structure, bonding, acids and bases, and organic chemistry.
Which year levels are covered? The samples run from Year 7 to Year 11, so younger students can build foundations while Year 10 and 11 students focus on exam topics.
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