A pure substance contains only one type of chemical.

A property of a substance is a feature or characteristic that can be used to classify it, or describe how it behaves.

A physical property of a substance describes how a substance appears and behaves, e.g. boiling point.

A chemical property describes chemical changes that happen to a substance in chemical reactions to form new substances.

Properties of elements

Science

In the Understanding Chemical Reactions unit, pupils will build on their knowledge of atoms, elements, and compounds to learn about how atoms rearrange to form new substances during chemical reactions.

In the Solid, Liquid and Gas States and Changes of State unit, pupils learned to categorise substances and understand particle behaviour during changes of state.

Atoms, elements and compounds

They change colour at certain temperatures.

They react chemically at these temperatures.

Why do elements have fixed melting and boiling points?

Which of the following are physical properties of an element?

Which of the following is **not** a physical property of an element?

A physical change is {{}} to reverse, e.g. melting or boiling. (Fill the blank with either difficult or easy)

True or false? In chemical reactions, new substances are always formed. 

Every element has its own {{}} combination of properties.

In chemistry, what does it mean if a substance is described as 'pure'?

An element on the Periodic Table is made up of only one type of ...

They cannot be physically separated into other substances.

Which statements explain why elements are considered to be pure substances?

A {{}} is a characteristic of something that helps us describe or identify it.

An example of a {{}} is the flavour of a lemon. It can be said to have a sour taste.

Which properties would be essential for making a saucepan?

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