Page 142 - Science Class 6 Times Publication

Chapter
Chapter

13 SOME USEFUL

CHEMICALS

Estimated periods: 5

OBJECTIVES

At the end of the lesson, the students will be able to :
Ü give introducti on of some useful chemicals such as common salt,
turmeric, amilo, yeast, etc;
Ü tell the uses of such chemicals.

MIND OPENERS
Ü What will be the taste of your curry if you don’t use common salt?
Ü Why do you use turmeric in your curry?
Ü Where is chook (amilo) obtained from? What is its use? Discuss.

Introduction

We use several compounds in our daily life. These compounds are
regarded as chemicals. For example, we use toothpaste to brush teeth,
shampoo to wash hair, soap to have bath, chilli powder to make curry
hot in taste, etc. In the same way, we use oil to fry vegetables, we use

glycerine to make our skin soft and moist, etc. Here, the substances
like soap, shampoo, toothpaste, chilli powder, glycerine, oil, etc are
made of chemicals.

In addition to these, we use many other chemicals in our daily life. For
example, we use common salt, turmeric, chook (amilo) and chilli in
our curry and pulses. We use baking soda to bake bread and biscuits.
We also use ginger in our curry. The ginger provides hot taste to our
food. It has also a medicinal value. Similarly, there are several other

chemical which are useful for prepare in food or medicinal value. For
example, onion, garlic, etc.

Times' Crucial Science and Environment 138 Book 6