SCI 5 FQ Chapter 1 Lesson 1 Recognizing Useful and Harmful Materials

1. Observe the common materials found at home

2. Classify these materials as useful or harmful materials

we should know which one to keep and which one should be disposed.

There are materials that are made to last longer and therefore can be reused several times.

Some of them can be reused for other purposes.

it serves its purpose or even beyond.

Empty bottles are made to contain any

solid or liquid material. When they are already

empty, they can still be made into flower vase,

coin bank, or house decors.

be used after it has served its

waste.

Examples are newspapers and food leftovers.

disposed of and thrown into a landfill.

A site where waste material are covered with layers of soil so as not to pollute the surrounding land

are considered as safe materials

They become toxic and harmful to living things and the environment.

• Car batteries

• Motor oil

• Tires

• Liquid waste (e.g., non-dried paint, household cleaners)

• Untreated medical waste

• Cathode ray tube (CRT)

• Screens (tube monitors and TVs)

• Products containing mercury

• Yard waste

• Computers

• Nickel-cadmium (NiCad, or rechargeable) batteries

• Lead-acid & rechargeable batteries

• Scrap Metal

• Construction & Demolition Waste