WorksheetsUnderstanding Elements, Compounds & Mixtures
Total questions: 15
Worksheet time: 8mins
What is an element?
A pure substance made up of two or more types of atoms.
A pure substance made up of only one type of atom.
A mixture of different substances.
A substance that can be easily separated.
What is a compound?
A single element.
A mixture of substances.
Two or more elements chemically joined together.
A substance that cannot be broken down.
Which of the following is an example of a mixture?
Water
Salt
Air
Carbon dioxide
What happens when iron and sulphur are mixed?
They form a new compound.
They can be easily separated.
They produce a gas.
They change colour.
What is formed when magnesium reacts with oxygen?
Magnesium sulphide
Magnesium chloride
Magnesium oxide
Magnesium nitride
What is the main component of air?
Oxygen
Carbon dioxide
Nitrogen
Water vapour
What is the process called when air is separated into its components?
Filtration
Distillation
Fractional distillation
Evaporation
Which of the following is a chemical change?
Ice melting
Water boiling
Iron rusting
Steam condensing
What is the percentage of oxygen in air?
78%
20%
0.04%
1.96%
Who developed the periodic table in 1869?
Albert Einstein
Isaac Newton
Dimitri Mendeleev
Marie Curie
What is an example of a compound?
Sand
Air
Coffee
Crude oil
What is a molecule?
A single atom
Atoms chemically joined together
A mixture of elements
A type of element
What is the boiling point of water in Celsius?
0°C
50°C
100°C
150°C
What is the main use of fractional distillation in crude oil?
To mix substances
To separate substances
To freeze substances
To burn substances
What is the chemical formula for water?
CO 2
H 2 O
O 2
NaCl
