Elements, Compounds & Mixtures

What is the definition of an element?

• A substance containing one atom

• A substance containing only one type of atom

• A substance containing two or more types of atom

• A substance containing chemically joined atoms

What is the chemical symbol for Helium?

• hE

• he

• He

• HE

How many elements are there on the periodic table?

• 61

• 85

• 99

• 118

Group 1 elements are ...

• Highly reactive metals

• Reactive non-metals

• Nonreactive metals

• Nonreactive non-metals

Group 8 elements are ...

• Highly reactive metals

• Reactive non-metals

• Nonreactive metals

• Nonreactive non-metals

A substance containing two or more types of atoms chemically joined together is called ...

• an Atom

• an Element

• a Compound

• a Mixture

What type of substance is shown in the diagram?

• An atom

• An element

• A compound

• A mixture

Which of the following are examples of mixtures?

• Sea water

• Sodium Chloride (salt)

• Oxygen

• Air

How do the properties of a compound compare the properties of the elements that make it?

• The compound is normally the same as both elements

• The compound is normally the same as one of the elements

• The compound is normally different to the elements

Which type of substance are the easiest to separate?

• Atoms

• Elements

• Compounds

• Mixtures