Question

describing the changes occuring around us in our daily life in to various kinds . 1topic if research 2) abstract 3) introduction 4) servey/method 5) result 6)conclusion 7)reference​

Answer 1

Answer:

Physical and 6 Chemical Changes

E

very day you come across many

changes in your surroundings.

These changes may involve one

or more substances. For example, your

mother may ask you to dissolve sugar

in water to make a cold drink. Making a

sugar solution is a change. Similarly,

setting curd from milk is a change.

Sometimes milk becomes sour. Souring

of milk is a change. Stretched rubber

band also represents a change.

Make a list of ten changes you have

noticed around you.

In this chapter we shall perform some

activities and study the nature of these

changes. Broadly, these changes are of

two kinds, physical and chemical.

Fig. 6.1 Paper pieces

6.1 PHYSICAL CHANGES

Activity 6.1

Cut a piece of paper in four square

pieces. Cut each square piece further

into four square pieces. Lay these pieces

on the floor or a table so that the pieces

acquire the shape of the original piece

of paper (Fig. 6.1).

Obviously, you cannot join the pieces

back to make the original piece, but is

there a change in the property of the

paper?

Activity 6.2

Collect the chalk dust lying on the floor

near the chalkboard in your classroom.

Or, crush a small piece of chalk into

dust. Add a little water to the dust to

make a paste. Roll it into the shape of a

piece of chalk. Let it dry.

Did you recover chalk from the

dust?

Activity 6.3

Take some ice in a glass or plastic

tumbler. Melt a small portion of ice by

placing the tumbler in the sun. You have

now a mixture of ice and water. Now

place the tumbler in a freezing mixture

(ice plus common salt).

Does the water become solid ice