WELCOME TO CLASS EIGHT SCIENCE LESSON
WATER
SOFT AND HARD WATER
Soft water
- It is water that lathers easily with soap.
b.It contains no or very little dissolved mineral salts.
c.Examples of soft water are; rain water distilled water and boiled water.
d.This water lathers easily with little soap.
Hard water
a.It is water with dissolved mineral salts of calcium and magnesium.
b.This water does not lather easily instead it forms scum –stearite.
c.scum forms on the water surface.
d.calcium +soap=calcium scum.
e.Magnesium+soap=magnesium scum.
f.Hard water reacts with soap forming scum.---this are the deposits present on the cloth being washed.
WORK TO DO
1.Water that lathers easily with soap is called--------------- water.
A.Soft B.Sweet C.Hard D.Nutritious
2.Which of the following is not a source of water
A.Taps B.Streams C.Wells D.Rivers
3.Which of the fowing is not aquality of pure water
A.Ouderlesss B.Colourless C.Tasteful D.Sportless
4.When hard water is mixed with soap, a certain insoluble substance forms known as--------------
A.Lather B.Scum C.Jik D.Foam
5.The borehole is asource of ----------- water.
A.Soft B.Hard C.Pure D.Colourful
The end; Wash your hand and take care.
