Write a research paper describing the changes occurring around us in a daily life into various kinds also write about the advantages and disadvantages of chemical change. Format of writing 1)Topic of research 2) Abstract 3)introduction 4) Survey / Methods of 5) Result 6)Conclusion 7) References (in 300 -500 words)
Answers
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