For sixth grade students

2.  Soluble : will dissolve or spread all through the liquid
 Insoluble : will not dissolve in the liquid
 Solute : a solid dissolved in a liquid
 Solvent : the liquid a solid dissolves in

3. No Materials/ Condition after Dissolve / not Mixture/
substances mixing with water dissolve solution
1 Sugar The sugar seems Dissolve Solution
disappear
2 Salt The salt seems Dissolve Solution
disappear
3 Instant The water colour Dissolve Solution
coffee change into brown
4 Sand The sand sink Not dissolve Mixture
5 Flour After a while the flour Not dissolve Mixture
sink again
6 Red syrup The water colour Dissolve Solution
change into red
7 Baking There is bubles Not dissolve (the Mixture
Powder produced and the bubbles show reaction
powder sink that produce gas)

4.  Tools for separating mixture
1. sieves 3. colander
2. paper sieves

5. Ways of
separation
Water and sand Decanting
Liquid
Solids

6. Ways of
Mixture separation
Oil
Water
Evaporate the water

7. Ways of
 Water and salt separation
Evaporate the Filtering using
water paper sieve

8. 1. State true or false for each sentence!
A. Salt will dissolve in water. ( )
B. Sugar dissolves quicker in hot water than cold water. (
)
C. When sweet tea is heated, the sugar evaporates.
( )
D. Stirring makes insoluble solids dissolve quicker.
( )

10. a. What can they do to make Stage A quicker?
b. What substance is removed at Stage B?
c. What substance remains in the evaporating dish at
Stage C?
d. Complete these two sentences. Choose words
from the list.
insoluble solvent solid soluble solution
 A solid dissolved in water is a …………….
 A substance that can dissolve in water is ……….

11. Which student has the correct answer to the teacher’s
question? Choose from student A, B, C or D.

12. A. What has happened to the salt?
B. She then pours some of the solution into a basin and heats it.

13. When the salt solution is heated salt crystals are
formed.
What has happened to the water?