Experiments with

waterPrepared by Priya Jha

KV R K PURAM SEC-2(2ND SHIFT)

3 R’s to save water

Properties of water

• Water is colourless, tasteless and

odourless.

• Water is liquid at room temperature,Ice as

a solid and Steam as vapour.

• Density of water is 1000 kg/cc.

• Water is the Universal Solvent.

• Water freeze at zero degree Celsius and

boil at 100 degree Celsius.

SINK OR FLOAT

FLOAT OR SINK

• Most of the objects float if it is Lighter in

weight or Density is less than water.

• Most of the objects float if it is Heavier in

weight or Density is more than water.

• Density is Mass per unit volume.

• Density of water is 1000 kg/meter cube.

• Only those objects float which can

displace the water as their weight.

Assessments

Group the following

objects.

A marble

An eraser

Wood

A pencil

A key

A coin

Cork

Lid of a bottle

Objects

that float

Objects

that sink

Why is the ‘Dead Sea’ is dead?

All oceans and seas have salty water.

The saltiest of all is the Dead Sea.

There are no life in this sea due to its salinity.

Every things dropped in it certainly float whether know

swimming or not due to salinity of the water of the sea.

Assessments

In the given picture a

person is floating on

water in a lake. What is

that lake called? How

he can float on water?

(or)

Why do a person who

cannot swim, will not

drown in Dead sea?

Location of Dead sea

It is located in Jordan (Israel).

Mark [✓] for the things that float. Mark [✕] for those that sink.

I guessed, before I did it

I saw, when I did it

(a) Empty bowl (katori)

(b) After putting in 6-7 small pebbles, one-by-one

Iron nail or pin

Matchstick

(a) Empty plastic bottle with its lid

closed

(b) bottle half-filled with water

(c) Bottle full of water

Find out from the other groups which things floated and which

sank in the water?

After doing the experiment, fill in the blanks.

1. The iron nail ______ in water but the katori ______. I think

this happened because _________________________________

2. The empty plastic bottle ______ on water. The bottle filled

with water ______ because ______________________________

DISSOLVE OR NOT DISSOLVE

Water is the Universal Solvent.

This property of water is used for

cooking, preparing medicine, in

industry etc.

Assessments

• Encircle the things

that dissolve in

water.

• Sugar, Lemon juice,

Oil, Fruit juice, Pepsi,

Salt, Chalk powder,

Mud, Ghee, Mishri

(sugar lumps), Milk.

• Group the following

into which are

soluble in water and

which are not

soluble in water.

• Blood, Ink, Curd,

Ghee, Wax, Wheat

flour, Sugar, Salt,

Pencil waste, Milk

• What things do you put in water to make

tea? Which of those things dissolves in

water?

• You have been given some mishri pieces

(lumps of sugar). Suggest some ways to

dissolve them quickly.

RACING DROPS

• Ayesha put two drops of oil on

the lid of her tiffin box. Next to

that she put two drops of water

and two drops of sugar

solution. She tilted the lid. She

saw some drops slid down

quickly, while some were left

behind.

• i) Which drops slid

down faster?

• ii) Which are slowest?

Why?

EVAPORATION

Water turn into water vapour at higher

temperature even at room temperature. In

this process water return back in to water

cycle in atmosphere.

You have washed your handkerchief and

you want to dry it quickly. What all can you

do?

Assessments

Look at the picture

and write how salt

can be obtained from

sea water.

DANDI YATRA

Assessments

Mahatma Gandhi was picking up salt in the

picture. In which march (or) movement he

did it? Why did he undertake this march?