Atoms, elements and compounds test questions - AQA - GCSE Chemistry (Single Science) Revision

1

What is the chemical symbol for the element mercury?

Hg

HG

hg

2

What is the chemical formula for chlorine?

Cl

Cl₂

2Cl

3

What is the name of the compound with the formula MgBr₂?

Magnesium bromide

Magnesium dibromide

Magnesium bromine

4

How many different types of atom are in one molecule of a substance that has the formula N₂O₄?

6

4

2

5

What is the formula of water?

H2O

HO₂

H₂O

6

What is the best definition of a compound?

A substance made up of two or more elements that are chemically combined

A substance made up of two or more elements that are chemically combined in fixed proportions

A substance made up of two elements that are chemically combined in fixed proportions

7

What is the formula of a substance made up of Al³⁺ ions and O^2- ions?

Al₂O₃

Al₃O₂

AlO₃

8

What are the reactants in this word equation?

sodium hydroxide + hydrochloric acid → sodium chloride + water

Sodium hydroxide and sodium chloride

Sodium hydroxide and hydrochloric acid

Sodium chloride and water

9

Which numbers correctly fill the gaps to balance this equation?

__Na + Cl₂ → __NaCl

2, 4

4, 2

2, 2

10

Which numbers correctly fill the gaps to balance this equation?

C₃H₈ + __O₂ → __CO₂ + __H₂O

3, 3, 2

10, 3, 8

5, 3, 4