WJEC GCSE Chemistry Substances and atomic structure (Unit 1.1 to 1.2) overview quiz quiz

A substance made of only one type of atom

Two or more elements chemically bonded in a fixed ratio

Two or more substances mixed but not bonded

A substance that cannot be broken down by any means

3

4

5

6

A solid melts when heated

A new substance with different properties is formed

A gas cools and condenses

Sugar dissolves in water

Mass is created in the reaction

Oxygen from the air combines with the magnesium

The magnesium gives off a gas

Heat adds mass to the solid

H2 + O2 to H2O

2H2 + O2 to 2H2O

H2 + O2 to H2O2

2H2 + 2O2 to 2H2O

Pencil shows up more clearly

Pencil does not dissolve and run up the paper

Ink reacts with the solvent

Pencil makes the spots travel further

0.3

0.6

1.7

0.15

Charge +1, mass 1

Charge 0, mass 1

Charge -1, mass negligible

Charge 0, mass negligible

13

14

27

40

Same neutrons, different protons

Same protons, different neutrons

Same electrons, different protons

Different protons and neutrons

2,8,10

2,8,8,2

2,8,9,1

2,18

The period of the element

The group of the element

The mass number

The number of neutrons

Decreases down the group

Increases down the group

Stays the same

Increases then decreases

Bromine is more reactive than chlorine

Chlorine is more reactive than bromine

They are equally reactive

Bromine is a gas and chlorine is a liquid

They have one outer electron

They have full outer electron shells

They are very heavy

They have no electrons

Iron rusting

Ice melting to water

Wood burning

Magnesium reacting with acid