Natural sciences
The earth and beyond
Properties and uses of materials
Educator section
Memorandum
Complete the following table:
PROPERTIES | SOLID | LIQUID | GAS |
VOLUME | It does not have a fixed volume – the volume changes easily. It spreads and occupies the available space. | ||
FORM | It takes the form of the container. | ||
WEIGHT | It has weight |
Examples of phase changes:
- Solid to liquid ice to water
- Liquid to solid water to ice
- Liquid to gas boiling water to water vapour
- Gas to liquid water vapour / moisture condensing against glass, e.g. car windows or kitchen windows
Leaner section
Content
Activity: to classify materials [lo 2.2, lo 2.3]
- Classification is when we divide substances with the same properties into groups.
- Scientists classify different materials in different ways. The most well known way is the classification into solids, liquids and gases.
Complete the following table:
PROPERTIES | SOLID | LIQUID | GAS |
VOLUME | Has a fixed volume. | Has a fixed volume. | ________________________________________________________ |
FORM | Has a fixed form. | ______________ ______________ ______________ | Takes on the form of the container. |
WEIGHT | Has weight. | Has weight. | ______________ |
A substance can change from one state to another through heating or cooling:
Give an example of the following changes:
- Solid to liquid:
_____________________________________________________________________
_____________________________________________________________________
- Liquid to solid:
_____________________________________________________________________
_____________________________________________________________________
- Liquid to gas:
_____________________________________________________________________
_____________________________________________________________________
- Gas to liquid:
_____________________________________________________________________
_____________________________________________________________________
Assessment
Learning Outcome 2: Learners know, interpret and apply scientific, technological and environmental knowledge.
Assessment Standard 2.2: We know this when the learner categorises information: categorises objects and organisms by two variables.
Assessment Standard 2.3: We know this when the learner interprets information: at the minimum, interprets information by using alternative forms of the same information.