Natural and Processed Materials

 

2.1 Students group materials on the basis of properties (including solubility, texture and hardness).

2.2 Students recognise ways in which changes in properties of familiar materials occur (including temperature change and magnetism).

Group according to properties such as:

·        solubility in water

·        lustre, colour, texture

·        transparent, translucent, opaque

·        flexibility, rigidity, elasticity, strength

·        softness, hardness

·        heavy, light; floats, sinks

·        solid, liquid, gas

·        magnetic, non-magnetic

·        odour, taste

Materials:

·        water, playdough, paper, food, plastic

·        wood, fabrics, metal, sand

Familiar materials:

·        glass, wood, playdough

·        eggs, pikelets, sugar, salt

·        ice, water, steam

Nature of change:

·        breaks, melts, solidifies

·        evaporates, condenses, freezes, melts

·        decomposes, combines, dissolves

·        change of shape, change of sound

·        change of colour, change of texture

Possible causes of change:

·        mixing, shaking

·        heating, cooling, cooking, burning

·        wetting, washing

·        combining, squeezing, manipulating

·        magnetism

2.3 Students explain why common materials are used in particular situations.

 

Common materials:

·        water

·        fabrics, glass, plastics, wood, metals

·        paper, soap

·        food — sugar, salt

·        sunscreen

Uses:

·        drinking, keeping cool, recreation

·        clothing, seeing through or with, building

·        drawing on, cleaning

·        food, tools

·        medicine