IGCSE Chemistry Mid Course Exam

The formula of copper(II) oxide is

• CuO

• Cu₂O

• CuO₂

The formula of sulphuric acid is

• HSO₄

• H₂SO₄

• H₂SO₃

• H₂SO₃

The formula of iron(III) oxide is

• FeO

• FeO₂

• Fe₂O

• Fe₂O₃

The formula of magnesium chloride is

• MgCl

• MgCl₂

• MgCl₃

The formula of calcium hydroxide is

• CaOH

• Ca(OH)₂

• Ca(OH)₃

The molar mass of an element is equal to its...

• Atomic mass
• Atomic number
• Oxidation number
• Valence electrons

What is the molar mass of fluorine gas?

(beware this molecule is diatomic)

• 18.998 g/mol

• 38 g/mol

• 9 g/mol

• 18 g/mol

What is the molar mass of table salt (NaCl)?

• 116.886 g/mol
• 35.453 g/mol
• 22.990 g/mol
• 58.443 g/mol

What is the mass of one mole of aluminum?

• 27 g
• 13 g
• 54 g
• 14 g

Calculate the number of gold atoms in a 4 mole sample of gold.

• 2.41x10²⁴
• 3.01x10²³
• 4.82x10²⁴
• 6.02x10²³