Task: Design, then execute, a lab protocol to investigate water
properties
Research question: Is water co-hesive/ ad-hesive?
Hypothesis:
If we test water's co-hesion and ad-hesion on various papers, it will
vary. For example, if we place water on wax paper, it will not be
absorbed and thus helps to prove that it is not very ad-hesive as it
will stay in a ball and will easily roll off. Also, the water will be
easily broken if we were to try separating it using a metal stick, and
this will show weak co-hesive forces. However on the other hand, if we
test toilet paper, the water will be absorbed more easily and thus
helps to prove that it is more ad-hesive to the paper as it will not
be able to roll off. Furthermore, the water will not be able to split,
and this will show strong co-hesive forces. All in all, it can be said
that the stronger the ad-hesion, the stronger the co-hesion, and vice
versa. We are hoping to see the weight of all the various papers
increase, which will indicate that they have absorbed water and thus
imply that the ad-hesion is great.
Variables:
Controlled variables:
· Temperature (23o)
· Amount of water on each paper (2 droplets)
· Amount of paper used (6x6 cm)
· Amount of time water is on the paper (1 minute)
Manipulated variables:
· Types of paper
o Wax
o Regular
o Paper towel
o Cardboard
o Toilet paper
Responding variables:
· Mass of the paper before and after water absorbed
Materials:
· Wax paper
· Regular paper
· Tissue paper
· Cardboard
· Toilet paper
· Stopwatch
· Scale
· Eye-dropper
· Water
· Beakers
Procedure:
(1) Measure and cut the different papers to 6x6 cm
(2) Collect water in beaker, take temperature and record
(3) Put first paper on scale and record weight
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