Year 10 Chemistry Quiz
Topic 1: Atomic Structure
Multiple Choice Questions
1. Which particle has a positive charge?
A. Electron
B. Proton
C. Neutron
D. Atom
2. Where are electrons found in an atom?
A. Nucleus
B. Proton shell
C. Energy levels around the nucleus
D. Neutron cloud
3. The atomic number of an element is equal to the number of:
A. Neutrons
B. Protons
C. Electrons and neutrons
D. Nucleons
4. An atom with 8 protons belongs to which element?
A. Carbon
B. Nitrogen
C. Oxygen
D. Fluorine
5. Neutrons are found in the:
A. Electron shell
B. Orbit
C. Nucleus
D. Outer shell
Short Answer Questions
6. Define an atom.
7. State the relative charges of a proton, neutron, and electron.
8. Calculate the number of neutrons in an atom with mass number 23 and atomic number
11.
9. Why are atoms electrically neutral?
10. Draw and label a simple atom.
Topic 2: Chemical Bonding
Multiple Choice Questions
11. A chemical bond is formed when atoms:
A. Break apart
B. Gain energy
C. Join together
D. Melt
12. Ionic bonding involves:
A. Sharing electrons
B. Transfer of electrons
C. Transfer of protons
D. Transfer of neutrons
13. Covalent bonding occurs when atoms:
A. Share electrons
B. Lose electrons
C. Gain neutrons
D. Lose protons
14. Sodium chloride (NaCl) contains:
A. Covalent bonds
B. Ionic bonds
C. Metallic bonds
D. Hydrogen bonds
15. Which substance contains covalent bonds?
A. Magnesium oxide
B. Sodium chloride
C. Water
D. Potassium bromide
Short Answer Questions
16. Explain the difference between ionic and covalent bonding.
17. Why do atoms form bonds?
18. Name one property of ionic compounds.
19. Name one property of covalent compounds.
20. Draw a dot-and-cross diagram for water (H₂O).
Topic 3: Chemical Formulae
Multiple Choice Questions
21. What is the chemical formula of water?
A. HO
B. H₂O
C. HO₂
D. H₂O₂
22. What is the formula for carbon dioxide?
A. CO
B. C₂O
C. CO₂
D. C₂O₂
23. Which formula represents sodium chloride?
A. NaCl
B. Na₂Cl
C. NaCl₂
D. Na₂Cl₂
24. How many oxygen atoms are in H₂SO₄?
A. 1
B. 2
C. 3
D. 4
25. What does the subscript "2" mean in H₂O?
A. Two water molecules
B. Two hydrogen atoms
C. Two oxygen atoms
D. Two compounds
Short Answer Questions
26. Write the formula for methane.
27. Write the formula for ammonia.
28. How many atoms are present in one molecule of CO₂?
29. What is the formula of magnesium oxide?
30. Explain what a chemical formula shows.
Topic 4: States of Matter
Multiple Choice Questions
31. Which state of matter has a fixed shape and volume?
A. Solid
B. Liquid
C. Gas
D. Plasma
32. In which state are particles furthest apart?
A. Solid
B. Liquid
C. Gas
D. Ice
33. The process of a liquid changing into a gas is called:
A. Freezing
B. Condensation
C. Evaporation
D. Melting
34. What happens to particles when a solid melts?
A. They stop moving
B. They move more freely
C. They disappear
D. They become smaller
35. Which process changes a gas directly into a liquid?
A. Condensation
B. Evaporation
C. Melting
D. Freezing
Short Answer Questions
36. Describe the arrangement of particles in a solid.
37. Define melting.
38. Define condensation.
39. Explain why gases can be compressed.
40. State two differences between solids and liquids.