Unit 3: Health Education Unit 3: Health Education
Harmful Substances
Harmful Substances
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Lesson 3 - OthercommonHarmfulSubstances
intheenvironment
 Activity1:Commonharmfulsubstances
1. Observe the pictures below. With the help of your teacher nd out the names of the
harmful substances and why these are used in the home.
Common harmful
substances
Name Use Cause
Food must never be heated in
these containers, as the product
from which they are made,
releases harmful substances when
heated in microwave ovens which
can cause cancer. Microwave
safe containers are: glass and
porcelain.
The chemical substances present
in batteries are highly toxic when
inhaled, swallowed or absorbed
through the skin. Wash hands
properly after using them.
Gas is highly toxic and can cause
death if inhaled.
Always make sure that there is a
proper ventilation when using gas
for cooking or heating water.
Bathrooms should be well
ventilated.Gas cylinders should be
installed outside the house.
These substances are highly dangerous and care should be taken when using them.
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