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
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
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.
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