Free GCSE Chemistry Question and Answers

Question 1

What exactly is an acid?

Accepted Answer

A substance that produces H+ ions when added to water

Answer

A chemical which changes colour when added to acids and alkalis

Answer

A soluble base

Answer

A substance that will neutralise an acid

Question 2

What exactly is an alkali?

Accepted Answer

A soluble base

Answer

A chemical which changes colour when added to acids and alkalis

Answer

A substance that produces H+ ions when added to water

Answer

A substance that will neutralise an acid

Question 3

What is a substance having a pH of 6?

Accepted Answer

a weak acid

Answer

neutral

Answer

a weak alkali

Answer

a strong acid

Question 4

Choose the right equation for the reaction between hydrochloric acid and iron oxide.

Accepted Answer

Hydrochloric acid + iron (III) oxide → iron (III) chloride solution + water

Answer

Sulfuric acid + iron (III) oxide → iron (III) chloride solution + water

Answer

Hydrochloric acid + iron (III) oxide → iron (II) chloride solution + water

Answer

Hydrochloric acid + solid iron (III) oxide → iron (III) chloride solution + water

Question 5

Which element can be found in all organic compounds?

Accepted Answer

Carbon

Answer

Nitrogen

Answer

Oxygen

Answer

Sulfur

Question 6

In organic compounds, what kind of bonds do carbon and hydrogen atoms form?

Accepted Answer

Covalent

Answer

Hydrogen

Answer

Metallic

Answer

Ionic

Question 7

A family of chemical compounds known as the alcohols is used for many things, including drinking. Which of the following types of alcohol do we only consume?

Accepted Answer

Ethanol

Answer

Butanol

Answer

Propanol

Answer

Methanol

Question 8

Which of the following alcohols has the chemical structure C4H9OH?

Accepted Answer

Butanol

Answer

Propanol

Answer

Ethanol

Answer

Methanol

Question 9

What process results in the vegetable oils' hardening?

Accepted Answer

Hydrogenation

Answer

Setting

Answer

Cracking

Answer

Polymerisation

Question 10

When limestone (calcium carbonate) is heated, calcium oxide is produced. What kind of reaction occurs?

Accepted Answer

Thermal decomposition

Answer

Combustion

Answer

Reduction

Answer

Oxidation