White sugar and kitchen salt dissolve in water. After dissolving salt or sugar, the
water remains clear.
Rice grains and sand do not dissolve in water. We can still see them after stirring.
What I have learnt
Activity to be performed at home.
Try the experiment with more substances at home.
With your parents’ help, try the above experiment with other substances such as tea
leaves, coee, lentils, glucose powder and beans at home. Use safe substances only.
Record your ndings in Table 1. Check the answers of your friends to nd out if they are
similar to yours.
Complete the sentences below with‘dissolves’, ‘does not dissolve’or‘do not dissolve’.
1. I see/cannot see sugar in glass A. Sugar ............................................ in water.
2. I see/cannot see sand in glass B. Sand ...................................................... in water.
3. I see/cannot see salt in glass C. Salt ........................................... in water.
4. I see/cannot see rice grains in glass D. Rice grains ..................................................... in water.
What do you conclude?
Salt and white sugar dissolve in water. In both cases, the water remains clear.
Rice grains and sand do not dissolve in water.
Substance
1
2
3
Does not dissolve (√)
Dissolves (√)
Table 1
10