Chemistry Quiz

Chemistry studies matter and the changes it undergoes. This quiz covers atoms, the periodic table, bonding, acids and bases, reactions and common compounds.

What this quiz covers

Study tip: Use the periodic table as a reference while you study; trends across periods and groups explain many answers.

Questions, answers and explanations

1. What is the chemical symbol for water?

  1. O₂
  2. H₂O
  3. CO₂
  4. NaCl

Answer: H₂O

Water is made of two hydrogen atoms and one oxygen atom (H₂O).

2. Which gas is essential for human respiration?

  1. Nitrogen
  2. Carbon Dioxide
  3. Oxygen
  4. Hydrogen

Answer: Oxygen

Humans breathe oxygen for cellular respiration.

3. What is the chemical symbol of Sodium?

  1. S
  2. So
  3. Na
  4. N

Answer: Na

The chemical symbol of Sodium is Na.

4. Which particle has a negative charge?

  1. Proton
  2. Neutron
  3. Electron
  4. Nucleus

Answer: Electron

Electrons carry a negative electric charge.

5. The pH value of a neutral solution is:

  1. 0
  2. 7
  3. 10
  4. 14

Answer: 7

A neutral solution has a pH of exactly 7.

6. Which gas is known as the 'King of Chemicals' in industrial production?

  1. Oxygen
  2. Hydrogen
  3. Sulfuric Acid
  4. Nitrogen

Answer: Sulfuric Acid

Sulfuric acid is called the 'King of Chemicals' because of its extensive industrial use.

7. What is the chemical formula of carbon dioxide?

  1. CO
  2. CO₂
  3. C₂O
  4. O₂

Answer: CO₂

Carbon dioxide contains one carbon atom and two oxygen atoms.

8. Which of the following is an alkali metal?

  1. Calcium
  2. Iron
  3. Sodium
  4. Copper

Answer: Sodium

Sodium belongs to Group 1 of the periodic table, known as alkali metals.

9. Which acid is present in vinegar?

  1. Hydrochloric Acid
  2. Sulfuric Acid
  3. Acetic Acid
  4. Nitric Acid

Answer: Acetic Acid

Vinegar mainly contains dilute acetic acid.

10. What is the atomic number of Oxygen?

  1. 6
  2. 7
  3. 8
  4. 9

Answer: 8

Oxygen has atomic number 8.

11. Which element has the chemical symbol 'Fe'?

  1. Fluorine
  2. Iron
  3. Francium
  4. Lead

Answer: Iron

Fe is the chemical symbol for Iron.

12. Which gas is released during photosynthesis?

  1. Carbon Dioxide
  2. Nitrogen
  3. Hydrogen
  4. Oxygen

Answer: Oxygen

Plants release oxygen during photosynthesis.

13. What is the smallest unit of an element?

  1. Molecule
  2. Atom
  3. Electron
  4. Compound

Answer: Atom

An atom is the smallest unit of an element that retains its chemical properties.

14. Which of the following is a noble gas?

  1. Oxygen
  2. Nitrogen
  3. Helium
  4. Hydrogen

Answer: Helium

Helium belongs to Group 18 of the periodic table, known as noble gases.

15. The atomic number represents the number of:

  1. Neutrons
  2. Electrons only
  3. Protons
  4. Nucleons

Answer: Protons

The atomic number is equal to the number of protons in the nucleus.

16. Which metal is liquid at room temperature?

  1. Iron
  2. Mercury
  3. Aluminum
  4. Copper

Answer: Mercury

Mercury (Hg) is the only metal that is liquid at normal room temperature.

17. What is the pH value of a strong acid?

  1. 7
  2. Greater than 7
  3. Less than 7
  4. 14

Answer: Less than 7

Acids have a pH below 7, while strong acids have very low pH values.

18. Which element is represented by the symbol 'Au'?

  1. Silver
  2. Gold
  3. Argon
  4. Aluminum

Answer: Gold

Au is the chemical symbol for Gold.

19. What is the chemical formula of common salt?

  1. KCl
  2. NaCl
  3. CaCl₂
  4. Na₂CO₃

Answer: NaCl

Common table salt is Sodium Chloride (NaCl).

20. Which scientist is known as the Father of Modern Chemistry?

  1. Isaac Newton
  2. John Dalton
  3. Antoine Lavoisier
  4. Dmitri Mendeleev

Answer: Antoine Lavoisier

Antoine Lavoisier is widely regarded as the Father of Modern Chemistry.

Take the timed quiz