Formulae and Relative Masses - Questions

Question 1

What is the molecular formula of water?

Answer 1

H₂O

Question 2

What is the molecular formula for ethene?

Answer 2

C₂H₄

Question 3

What is the molecular formula for iron (III) oxide?

Answer 3

Fe₂O₃

Question 4

What is the molecular formula of ammonium carbonate?

Answer 4

(NH₄)₂CO₃

Question 5

What is the chemical symbol of Helium?

Answer 5

He

Question 6

What is the chemical symbol of Iodine?

Answer 6

I

Question 7

State the formula of the ionic compound formed from: Fe²⁺, Cl⁻

Answer 7

FeCl₂

Question 8

State the formula of the ionic compound formed from: Ag⁺ , F⁻

Answer 8

AgF

Question 8

State the formula of the ionic compound formed from: Li⁺ , Cl⁻

Answer 8

LiCl

Question 9

State the formula of the ionic compound formed from: Na⁺ , CO₃²⁻

Answer 9

Na₂CO₃

Question 10

Balance: _Cu + O₂ → _CuO

Answer 10

2Cu + O₂ → 2CuO

Question 11

Balance: N₂ + _H₂ → _NH₃

Answer 11

N₂ + 3H₂ → 2NH₃

Question 12

Balance: _Fe + _H₂O → _Fe₃O₄ + _H₂

Answer 12

3Fe + 4H₂O → Fe₃O₄ + 4H₂

Question 13

Balance: _NaOH + H₂SO₄ → Na₂SO₄ + _H₂O

Answer 13

2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O

Question 14

What is the Ar of Fluorine?

Answer 14

19

Question 15

What is the Mr of CuCO₃?

Answer 15

123.55 g/mol

Question 16

What is the Mr of NH₄NO₃?

Answer 16

80g/mol

Question 17

What is the Mr of C₅H₅N?

Answer 17

79g/mol