Yr 8 Chemistry

Salt is a combination of one sodium atom and one chlorine atom. Its formula, in symbols, would be

• S C

• So Cl

• Ga Ge

• Na Cl

Because elements are organised into like groups on the periodic table, calcium is most like

• magnesium

• carbon

• chlorine

• uranium

Which two elements are most likely to be similar in properties?

• magnesium and manganese

• calcium and chlorine

• argon and krypton

• potassium and calcium

The element with the atomic number of 16 is

• oxygen

• sulfur

• phosphorus

• antimony

The element with the atomic mass of 16 is

• O

• S

• P

• Sb

Two atoms of hydrogen and one atom of oxygen make a molecule of

• air

• water

• wood

• fire

If you have 1kilogram of each of the following, which is heavier?

• Na

• Cu

• Au

• Pb

• All weigh 1 kg.

A molecule of hydrochloric acid is HCl, how many elements is it made up of?

• 1

• 2

• 3

• 4

Bright advertising lights are called neon lights, they contain

• a metal filament

• a vacuum

• nitrogen

• neon

Aluminium is

• a metal

• an element

• light weight

• strong