IGCSE Chem 04

The equation shows the reaction between magnesium and sulfuric acid.

[Ar: H, 1; O, 16; Mg, 24; S, 32]

Mg + H₂SO₄ → MgSO₄ + H₂

In this reaction, which mass of magnesium sulfate is formed when 6 g of magnesium react with excess sulfuric acid?

• A 8

• B 24

• C 30

• D 60

Two atoms of magnesium, Mg, react with one molecule of oxygen, O₂.

What is the formula of the product?

• A MgO

• B MgO₂

• C Mg₂O

• D Mg₂O₂

What is the relative molecular mass (M_r) of HNO₃?

• A 5

• B 31

• C 32

• D 63

The relative formula mass, Mr, of copper(II) sulfate, CuSO₄, is 160.

Which mass of sulfur is present in 160 g of copper(II)sulfate?

• A 16 g

• B 32 g

• C 64 g

• D 128 g

A compound has the formula CH₃CO₂H.

How should the relative molecular mass, M_r, of this compound be calculated?

• A 12 + 1 + 16

• B 3(12 + 1) + 2(12 + 16) + 1

• C (4 × 12) + (2 × 1) + 16

• D (2 × 12) + (4 × 1) + (2 × 16)

he equation shows the reaction between magnesium and sulfuric acid.

Mg + H₂SO₄ → MgSO₄ + H₂

(Mg = 24, H = 1, S = 32, O = 16)

In this reaction, what mass of magnesium sulfate will be formed when 6 g of magnesium reacts with excess sulfuric acid?

• A 8

• B 24

• C 30

• D 60

Which relative molecular mass, M_r, is not correct for the molecule given?

• A

• B

• C

• D

The structure of an organic compound, X, is shown.

What is the molecular formula of X?

• A C₆H₉

• B C₆H₁₂

• C C₇H₁₂

• D C₇H1₄

KNO₃ --> KNO₂ + O₂
What coefficients are needed to balance the reaction?

• 2, 2, 1
• 2, 3, 2
• 1, 2, 2
• 1, 3, 1

Tags

NGSS.HS-PS1-7

WO₃ + H₂ --> W + H₂O
What coefficient goes in front of H₂?

• 1
• 2
• 3
• 4

Tags

NGSS.HS-PS1-7