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Water’s Unique Property Lab
Experiment #1:
What is cohesion?-waters
attraction to other water molecules
Cohesion: the attraction between like molecules. (one water molecule to another water molecule.
- Due to the fact that water is a polar molecule and opposites attract.
Experiment #5:
What is surface tension?
A property of liquid surfaces that causes the surface layer to behave like a thin elastic 'skin'.
Molecules in a liquid have attractive forces that hold them together.
Molecules on the surface are attracted to molecules from all sides and below, but not from above. ...
Experiment #3:
Water Alcohol
Density: Mass/Volume
Water in it’s solid form is less dense than its liquid form.
But why?
Again, WHY ?When frozen, the water
molecules slow down and due to their polarity they will line themselves up + to – end thus taking up more volume and lowering it’s density.
O
H H
- +
..
O-
H H+H
HH
H
O
O
SolidLiquid
Likes dissolve likes
Water is polar so it will dissolve any other substance that is polar
A polar molecule has one + and one – end
Did salt dissolve in water?
Yes it did
Why?Salt is NaCl Na+1 Cl-1 Since salt has a + and – end it is polar
Did sugar dissolve in water?
Yes it didWhy?
Sugar is a polar molecule
Did oil dissolve in water?
NO
Why?
water is polaroil is not polar, it is
nonpolar
Did powder soap dissolve in water?
NO
Why?
water is polarsoap is not polar, it is
nonpolar
Why? Grease/oil is nonpolar and soap is nonpolar
What occurred?
Why did this occur?
Due to cohesion and adhesion
Adhesion:
Waters attraction to other substancesWater attracted to the string
Cohesion:
Water attracted to other water molecules