STD 8 SCIENCE..

GRADE 3… MATHEMATICS.
July 3, 2020
KISWAHILI 3..
July 5, 2020

STD 8 SCIENCE..

Welcome to your STD 8 SCIENCE..

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STD 8 SCIENCE  LESSON

WATER


Compare the two types of water in the bottles.



SOFT   WATER

  • It is   water      without  any   dissolved     mineral  salts  of  calcium  and  magnesium  or   has  small   amounts  of 
  • This water  lathers  easily   with  soap    and   one  uses   little    soap   when  

 

Sources  of  soft  water

1 .rain   water

  1. distilled water

3.boiled  water

 

Advantages  of   soft  water

  • It is  good  for  [laundry  work] washing   and   bathing  as  it  lathers  easily   with  
  • It is  good   for   mixing  chemicals   and 
  • It is  good  for   irrigation

 

Disadvantages   of   soft  water

  • It is    not  good    for  drinking  because  it  lacks  calcium    and   magnesium 
  • It does  not   have   good   taste

 

SOFTENING     HARD  WATER

Softening   hard   water  is    the  process  of   removing  dissolved    minerals  in  water.

Water  softening  can   be   achieved  by boiling.

 

WORK  TO  DO

  1. Soft water forms    -------  with    soap

 

  1. The process of  removing  hardness  in  water  is  known   as -------------

3. ----------  is  a  source  of  soft  water.

  1. Bathing and washing   is  also  known    as  ------------------

 

  1. Water  has   dissolved    mineral    salts    of  calcium  or-------

6.---------------- water  is  good  for   irrigation.

 

7.Hard  water  forms   ----------------  with  soap.

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