Here is a 20-question quiz in English designed to test your knowledge in chemistry

1. What is the chemical symbol for water?

WO H₂O HO₂ Wa

2. Which state of matter has a definite volume but an indefinite shape?

Solid Liquid Gas Plasma

3. Which subatomic particle has a positive charge?

Electron Neutron Proton Photon

4. What is the most abundant element in the Earth's atmosphere?

Oxygen Carbon Dioxide Nitrogen Argon

5. A solution with a pH of 2 is considered:

Neutral Weakly basic Strongly acidic Weakly acidic

6. What type of reaction combines two or more reactants to form a single product?

Decomposition Single displacement Synthesis (Combination) Combustion

7. Which of the following is an element, not a compound?

Salt (NaCl) Water (H₂O) Oxygen (O₂) Carbon Dioxide (CO₂)

8. The atomic number of an element is determined by the number of:

Neutrons Protons Electrons Protons and Neutrons

9. What is the chemical formula for sulfuric acid?

HCl HNO₃ H₂SO₄ CH₃COOH

10. If an object has a mass of 100 grams and a volume of 50 cm³, what is its density?

0.5 g/cm³ 2 g/cm³ 5 g/cm³ 150 g/cm³

11. Which of the following is a characteristic property of metals?

Brittleness Poor electrical conductivity Malleability Dull appearance

12. The branch of chemistry that deals with carbon-containing compounds is called:

Inorganic chemistry Analytical chemistry Physical chemistry Organic chemistry

13. Which electrons are primarily involved in chemical bonding?

Inner shell electrons Core electrons Valence electrons All electrons

14. Boyle's Law states that for a fixed amount of gas at constant temperature, pressure is inversely proportional to:

Temperature Volume Moles Density

15. What is the pH of a neutral solution at 25°C?

0 7 14 It varies

16. Which type of bond involves the sharing of electron pairs between atoms?

Ionic bond Metallic bond Covalent bond Hydrogen bond

17. Elements in the same group (column) of the periodic table typically have similar:

Atomic masses Number of electron shells Chemical properties Melting points

18. Why must chemical equations be balanced?

To ensure the reaction proceeds To satisfy the Law of Conservation of Mass To make the equation look neat To determine the limiting reactant

19. Oxidation typically involves the _____ of electrons.

Gain Loss Sharing Transfer

20. What is the common name for Sodium Chloride (NaCl)?

Baking soda Bleach Table salt Sugar

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