EmSAT EmSAT Chemistry

Question 1

What is the electron configuration of oxygen (atomic number 8)?

Accepted Answer

1s² 2s² 2p⁴

Answer

1s² 2s² 2p⁶

Answer

1s² 2s⁴ 2p²

Answer

1s² 2s² 2p² 3s²

Question 2

What type of bond is formed between Na and Cl in NaCl?

Accepted Answer

Ionic bond

Answer

Covalent bond

Answer

Metallic bond

Answer

Hydrogen bond

Question 3

What is Avogadro's number?

Accepted Answer

6.022 × 10²³

Answer

6.022 × 10²⁰

Answer

3.14 × 10²³

Answer

1.38 × 10²³

Question 4

Balance the equation: H₂ + O₂ → H₂O

Accepted Answer

2H₂ + O₂ → 2H₂O

Answer

H₂ + O₂ → H₂O

Answer

H₂ + 2O₂ → 2H₂O

Answer

2H₂ + 2O₂ → 2H₂O

Question 5

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

Accepted Answer

7

Answer

0

Answer

14

Answer

1

Question 6

What is the molar mass of water (H₂O)?

Accepted Answer

18 g/mol

Answer

16 g/mol

Answer

20 g/mol

Answer

14 g/mol