CAIE IGCSE Chemistry 3.1 Formulae Topic Practice

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Covered syllabus points

3.1.1—Formulae of the elements and compounds3.1.2—Molecular formula of a compound as the3.1.3—Deduce the formula of a simple3.1.4—Construct word equations and symbol3.1.5—Empirical formula of a compound as the3.1.6—Deduce the formula of an ionic3.1.7—Construct symbol equations with state3.1.8—Deduce the symbol equation with state

Question 1

[Maximum number: 1]

Caffeine is a stimulant found in coffee.

caffeine

caffeine

Which formula represents caffeine?

A

C7H10 N4O2\mathrm{C}_{7} \mathrm{H}_{10} \mathrm{~N}_{4} \mathrm{O}_{2}

B

C8H10 N3O2\mathrm{C}_{8} \mathrm{H}_{10} \mathrm{~N}_{3} \mathrm{O}_{2}

C

C8H10 N4O2\mathrm{C}_{8} \mathrm{H}_{10} \mathrm{~N}_{4} \mathrm{O}_{2}

D

C8H11 N4O2\mathrm{C}_{8} \mathrm{H}_{11} \mathrm{~N}_{4} \mathrm{O}_{2}

Question 2

[Maximum number: 1]

Caffeine is a stimulant found in coffee.

Figure for Question 2 — CAIE IGCSE Chemistry

caffeine

Which formula represents caffeine?

A

C7H10 N4O2\mathrm{C}_{7} \mathrm{H}_{10} \mathrm{~N}_{4} \mathrm{O}_{2}

B

C8H10 N3O2\mathrm{C}_{8} \mathrm{H}_{10} \mathrm{~N}_{3} \mathrm{O}_{2}

C

C8H10 N4O2\mathrm{C}_{8} \mathrm{H}_{10} \mathrm{~N}_{4} \mathrm{O}_{2}

D

C8H11 N4O2\mathrm{C}_{8} \mathrm{H}_{11} \mathrm{~N}_{4} \mathrm{O}_{2}

Question 3

[Maximum number: 2]

Sulfur is a Group VI element.

Question (a)

(a)

An acid containing sulfur reacts with sodium hydroxide, NaOH , to form a salt and water. The salt has the formula Na2SO3\mathrm{Na}_{2} \mathrm{SO}_{3}.

[ 2 ]

Question (i)

(i)

Deduce the formula of this acid.

[ 1 ]

Question (ii)

(ii)

Deduce the formula of the anion in Na2SO3\mathrm{Na}_{2} \mathrm{SO}_{3}.

[ 1 ]
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