Chemistry Quiz

15 questions, easier first and harder toward the end. Pick one answer per question.

1 Chemical formula of water:

H O₂ H₂O HO₂

2 Gas essential for combustion:

Nitrogen Oxygen Carbon dioxide Hydrogen

3 pH of pure water:

0 7 10 14

4 Element with symbol Fe:

Fluorine Iron Nickel Lead

5 Atoms of the same element with different masses:

Ions Isotopes Isomers Compounds

6 Mass number of an atom equals:

Protons Neutrons Protons + electrons Protons + neutrons

7 Turns blue litmus red:

Base Salt Acid Alkali

8 Atomic number of Carbon:

4 6 12 14

9 Bond where electrons are shared:

Ionic Covalent Metallic Hydrogen

10 Avogadro's number ≈

3.14×10⁸ 6.022×10²³ 9.81×10⁹ 1.6×10⁻¹⁹

11 Which of these is amphoteric?

Na₂O SO₂ Al₂O₃ CaO

12 Balance: __H₂ + __O₂ → __H₂O

2, 1, 2 1, 1, 1 2, 2, 2 1, 2, 1

13 General formula for alkanes:

CₙH₂ₙ CₙH₂ₙ₊₂ CₙH₂ₙ₋₂ CₙHₙ

14 Which is a noble gas?

Chlorine Argon Nitrogen Sodium

15 Electrolysis of CuSO₄ with Cu electrodes — cathode:

Cu deposited O₂ released H₂ released SO₄²⁻ deposited

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