3.3 To distinguish the most important groups of materials  (Page 2/2)

When polyester is mixed with cotton we get a new mixture, polyester cotton. It washes easily, dries quickly and irons easily. Denim material is also mixed with Lycra, which yields a strong material that can stretch.

ASSIGNMENT 11 (INDIVIDUAL)

• Look at the labels on your clothes at home and see which materials are used. Try to find as many composite (mixed) materials as possible.

More and more materials are being mixed to supply increasing demands. Not all mixtures are manmade however. Bone, for instance, is a natural mixture.

• Identify and research another five examples of mixtures that play an important role in the modern, technological world.

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Assessment

Learning Outcome 1: Learners respond confidently to their desire to learn about natural phenomena; they investigate relationships and solve problems within the context of science, technology and the environment.

Assessment Standard 1.2: We know this when the learner conducts investigations and collects data: conducts simple tests or surveys and records observations or responses.

Assessment Standard 1.3: We know this when the learner evaluates data and communicates findings: relates observations and responses to the focus question.

Learning Outcome 3: Learners are able to show understanding of the interrelationships between science and technology, society and the environment.

Assessment Standard 3.2: We know this when the learner understands the impact of science and technology: suggests ways to improve technological products or processes and to minimise negative effects on the environment.