Experiments with Experiments with waterwater

Prepared by Priya JhaPrepared by Priya Jha

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

Reduce Repair Re-use

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 1 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.

AssessmentsAssessments

In the given picture a In the given picture a person is floating on person is floating on water in a lake. What water in a lake. What is that lake called? is that lake called? How he can float on How he can float on water?water?

(or) (or)

Why do a person who Why do a person who cannot swim, will not cannot swim, will not drown in Dead sea?drown in Dead sea?

Location of 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 whichsank in the water?After doing the experiment, fill in the blanks.1. The iron nail ______ in water but the katori ______. I thinkthis happened because _________________________________2. The empty plastic bottle ______ on water. The bottle filledwith water ______ because ______________________________

DISSOLVE OR NOT DISSOLVE OR NOT DISSOLVEDISSOLVE

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?

AssessmentsAssessments

Look at the picture Look at the picture and write how salt and write how salt can be obtained can be obtained from sea water.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?