EduNinja

[Maximum number: 1]

Caffeine is a stimulant found in coffee.

caffeine

Which formula represents caffeine?

A

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

B

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

C

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

D

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

[Maximum number: 1]

Caffeine is a stimulant found in coffee.

caffeine

Which formula represents caffeine?

A

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

B

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

C

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

D

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

[Maximum number: 1]

What is the empirical formula of ethanoic acid?

A

CHO

B

$\mathrm{CH}_{2} \mathrm{O}$

C

$\mathrm{C}_{2} \mathrm{H}_{2} \mathrm{O}$

D

$\mathrm{C}_{2} \mathrm{H}_{4} \mathrm{O}_{2}$

CAIE IGCSE Chemistry 3.1 Formulae Topic Practice