1. Presented by:Presented by:
Sant Josep school
6th course primary
Navas, Barcelona, Spain
Teachers:
Fina Vendrell ,Eva Rosell and Núria Subirana
2. EXPERIMENT 1
Water described as "hard" means it is high in dissolved minerals,
specifically calcium and magnesium. Hard water is not a health risk, but
a nuisance because of its tendency to cause mineral buildup in water
pipe and heating systems, and its poor soap and/or detergent
performance when compared with soft water.
3. Learn that calcium in water alter its cleaner
action.
Find out that water has dissolved minerals,
specially calcium and magnesium, and they
make water hard.make water hard.
The degree of hardness becomes greater as
the calcium and magnesium content
increases.
4. 3 EMPTY JAR WITH THEIR LIDS
WASHING-UP LIQUID
SALT
1 TEASPOON1 TEASPOON
1 CUP FULL OF CHALK
WATER
5. Fill the 3 jars half full of water.
In the first jar add 4 salt teaspoons.
In the second jar add mashed chalk.
In the third jar nothing.
Add one teaspoon of washing-up liquid to each jar.
Put the lid on each jar and shake them.
6. We’ve observed that in the first jar there is no
lather at all, in the second jar, there is a little
bit of lather, and finally in the third one there
is a lot.
Water is a good solvent and picks up
impurities easily.impurities easily.
To gain lather water and soap have to mix up.
If the water contains a big quantity of
dissolved minerals, soap can’t combine with
water. So it forms a white precipitate instead
of producing lather.
7. EXPERIMENT 2
OBSERVING WATER PROPERTIES ADHESION AND
COHESIONadhesion, the attraction between water and
another object cohesion Water is attracted to water
8. Understand better adhesion and cohesion
properties.
Observe that these properties are present in
the nature.
10. Cut a piece of string
Dip the string in water
Tape one end inside the cup
Fill one of the cups with water
Add some coloring to the water
Put the other end of the string in the water
Hold the cups with one above the other, but not directly overHold the cups with one above the other, but not directly over
each other
Be careful not to pull the string out of your top cup.
Slowly begin pouring the water out of the top cup. Pour the water
out of the side of the cup with the string.
You'll begin to see the water travel down
the string towards the other cup.
11. Water has a physical property called cohesion,
the action of like molecules sticking together,
water molecules are able to stick to other water
molecules on their way to the lower cup.
But what about the water that poured out at first?
Molecules of water can stick to other materials,
But what about the water that poured out at first?
Molecules of water can stick to other materials,
too. This is a property called adhesion. In this
case, water molecules are able to stick to the
string, too.
This process can also be seen in plants where
moisture travels from the roots to the rest of the
plant.
