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```					Temperature of solvent

Procedures: 1.Fill 100cm3 of water into two beakers named X and Y.
2.Heat up the water in beaker Y until the temperature reach 750c.
3.Add 1 tablespoon of fine salt into both beakers and the stir at the same rate.
4.Observe the salt in both to find which dissolves faster by using the stop- watch

Variables      :
Fixed Variables      :            Amount of water, amount of sugar and rate of string.
Manipulated Variables:            Temperature of water.
Responding Variables :            The rate of solution .

Records /Data collecting:-

Beaker                             Temperature                       Time taken
X (Fine salt)
Y (Fine salt)

Result:            The higher the temperature of solvent, the faster the rate of dissolution

3
100cm
100cm3

Beaker x                                                Beaker        y
B.      SIZE OF PARTICLES

Procedure : 1. Fill 100cm3 of water info four beakers named w,x,yand z.
2. Add 3 tablespoons of fine salt into beaker w.
3. Add 3 tablespoons of course salt into beaker x.
4. Add 3 tablespoons of sugar into beaker y.
5. Add 3 tablespoons of course sugar into beaker z.
6 .Stir each mixture at the same rate.
7. Observe the sugar in both beakers to find which dissolves
faster by using the stop – watch.

Variables :

1) Fixed Variables       :        Amount of mixture used.
2) Manipulated Variables :        Size of solute particles.
3) Responding Variables :         Rate of dissolution

Records /date collecting:

Type of sovent           Rate of dissolvent     Time Taken

W(3 tablespoons of fine salt)            Fast

X (3 tablespoons of course salt)         Slow

Y (3 tablespoons of sugar)               Fast

Z (3 tablespoons of course salt)         Slow

Result : The smaller the size of solute particles ,the faster is dissolution rate

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 views: 7 posted: 4/15/2012 language: English pages: 2
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