Task 5 Recognizing Useful and Harmful Materials

How do materials become harmful?

• they can cause cuts or injury

• they can be recycled

• they serve their purpose.

How do materials become useful?

• they can cause cuts or injury

• they can last shortly

• they serve their purpose.

they carry toxic substances such as paints, cleaners, fumes, gels, or powders

• useful

• harmful

they have

properties such as durability, flexibility, elasticity, hardness, and resistance to water,

heat, or acid.

• useful

• harmful

they bring harm to your health, environment, and other organisms when not used

properly

• useful

• harmful

If the label has the words "harmful if inhaled" it can harm you if....

• you breathe it in.

• you eat it.

• you get it on your skin.

• you drink it.

Among the 4 options, which is considered useful?

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• 
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When is a material harmful?

• When the material can be used many times.

• When the material gives other uses aside from its purpose.

• When the material can be used in cooking.

• When the material brings danger to people and environment.

Which picture is an example of a harmful material?

• 
• 
• 
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When is a material considered waste?

• When the material is still another use.

• When the material served its primary use and can be discarded.

• When the material can be repaired.

• When the material can be recovered and be used a fuel.