Starter quiz
- In chemistry, what does it mean if a substance is described as 'pure'?
- It is clean and safe to use.
- It contains only one chemical substance. ✓
- It is natural and not man-made.
- It has been filtered.
-
- An element on the Periodic Table is made up of only one type of ...
- 'atom' ✓
- Which statements explain why elements are considered to be pure substances?
- They are always safe to handle.
- They are made of only one type of atom. ✓
- They are found in nature.
- They cannot be physically separated into other substances. ✓
-
- A ______ is a characteristic of something that helps us describe or identify it.
- 'property' ✓
- An example of a ______ is the flavour of a lemon. It can be said to have a sour taste.
- 'property' ✓
- Which properties would be essential for making a saucepan?
- shiny
- good conductor of heat ✓
- lightweight ✓
- brittle
- high melting point ✓
-
Exit quiz
- Why do elements have fixed melting and boiling points?
- They change colour at certain temperatures.
- They are pure substances. ✓
- They react chemically at these temperatures.
- They dissolve at these temperatures.
-
- Which of the following are physical properties of an element?
- colour ✓
- reactivity with acid
- acidity ✓
- boiling point
- reactivity with water
-
- Which of the following is not a physical property of an element?
- density
- melting point
- hardness
- shininess
- flammability ✓
-
- A physical change is ______ to reverse, e.g. melting or boiling. (Fill the blank with either difficult or easy)
- 'easy' ✓
- True or false? In chemical reactions, new substances are always formed.
- True ✓
- False
- Every element has its own ______ combination of properties.
- 'unique' ✓
Worksheet
Loading worksheet ...
Presentation
Loading presentation ...
Video
Lesson Details
Key learning points
- Elements are chemically pure, but can react together.
- Each element has a fixed melting point and boiling point.
- Each element has particular physical properties.
- Each element has particular chemical properties.
- The properties of elements are different from those of a single atom.
Common misconception
Students often confuse the difference between chemical and physical properties.
A chemical property describes how an element will react with other substances. Physical properties describes the appearance and behaviour.
Keywords
Pure substance - A pure substance contains only one type of chemical.
Property - A property of a substance is a feature or characteristic that can be used to classify it, or describe how it behaves.
Physical property - A physical property of a substance describes how a substance appears and behaves, e.g. boiling point.
Chemical property - A chemical property describes chemical changes that happen to a substance in chemical reactions to form new substances.
+