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

Science Grade 5 FQ Lesson 1

Recognizing Useful and Harmful Materials

Objectives: Learners are expected to

1. Observe the common materials found at home

2. Classify these materials as useful or harmful materials

Open Ended

Why is it important to know which materials are useful?

In order to minimize the waste in our household,

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

Poll

Before throwing, one must first check if a material can cause harm to living things and the environment. Do you know what to do before you throw?

• yes

• no

• maybe

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The usability of certain material depends on its properties.

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

Multiple Select

Which of these are reused several times?

• Aluminum

• Paper

• Plastic

• Glass

• Metal

There are also those materials that are not meant to be reused.

Some of them can be reused for other purposes.

Multiple Select

Which of these should be used only once?

• Grease- or Oil-Soaked Cardboard

• Most Bottle Lids/Caps

• Ceramic or Oven-Safe Serving Pieces

• Styrofoam or Polystyrene Containers

• Plastic Bags and Plastic Wrap

20 Surprising Things You Cannot Recycle - Bob Vila

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Open Ended

When is a material useful?

A material is considered useful when

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.

When a material can no longer

be used after it has served its

purpose, it is already considered

waste.

Examples are newspapers and food leftovers.

Open Ended

When is a material considered waste?

Some waste materials can be safely

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

Paper, clothing, plant clippings, and food scraps,

are considered as safe materials

Acceptable Materials for Landfill | Environmental Center | University of Colorado Boulder

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Not all waste materials are safe enough to be dumped directly in the landfill.

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

Multiple Select

Which of these are toxic waste materials?

• food scraps

• used batteries

• rubber tires

• paints

• motor oil

Examples of toxic materials:

• 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)

Examples of toxic materials:

• Products containing mercury

• Yard waste

• Computers

• Nickel-cadmium (NiCad, or rechargeable) batteries

• Lead-acid & rechargeable batteries

• Scrap Metal

• Construction & Demolition Waste