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To classify materials

Module by: Siyavula Uploaders. E-mail the author

NATURAL SCIENCES

The earth and beyond

Properties and uses of materials

EDUCATOR SECTION

Memorandum

Complete the following table:

Table 1
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:

Table 2
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:

Figure 1
Figure 1 (graphics1.png)

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 learnerinterprets information: at the minimum, interprets information by using alternative forms of the same information.

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Definition of a lens

Lenses

A lens is a custom view of the content in the repository. You can think of it as a fancy kind of list that will let you see content through the eyes of organizations and people you trust.

What is in a lens?

Lens makers point to materials (modules and collections), creating a guide that includes their own comments and descriptive tags about the content.

Who can create a lens?

Any individual member, a community, or a respected organization.

What are tags? tag icon

Tags are descriptors added by lens makers to help label content, attaching a vocabulary that is meaningful in the context of the lens.

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