Tahsili Chemistry

Question 1

What is the electron configuration of carbon (atomic number 6)?

Accepted Answer

1s² 2s² 2p²

Answer

1s² 2s² 2p⁴

Answer

1s² 2s¹ 2p³

Answer

1s² 2p⁴

Question 2

What type of bond forms between sodium (Na) and chlorine (Cl)?

Accepted Answer

Ionic bond

Answer

Covalent bond

Answer

Metallic bond

Answer

Hydrogen bond

Question 3

What is the pH of a solution with a hydrogen ion concentration of 10⁻³ M?

Accepted Answer

3

Answer

11

Answer

-3

Answer

7

Question 4

Balance the equation: __Fe + __O₂ → __Fe₂O₃

Accepted Answer

4Fe + 3O₂ → 2Fe₂O₃

Answer

2Fe + O₂ → Fe₂O₃

Answer

Fe + O₂ → Fe₂O₃

Answer

3Fe + 2O₂ → Fe₃O₂

Question 5

What is Avogadro's number and what does it represent?

Accepted Answer

6.022 × 10²³ — the number of particles in one mole of a substance

Answer

3.14 × 10²³ — the number of protons in a mole

Answer

1.6 × 10⁻¹⁹ — the charge of an electron

Answer

9.8 — the acceleration due to gravity

Question 6

What is the molar mass of water (H₂O)?

Accepted Answer

18 g/mol

Answer

16 g/mol

Answer

20 g/mol

Answer

2 g/mol