ORAL QUESTIONS
1. When sugar is dissolved in water, why can't the individual particles of sugar be seen?
2. Name two substances that are soluble and two that are not soluble in water.
3. Can you dissolve more sugar in a saturated solution of sugar in water at a particular temperature?
4. A saturated solution of sugar in water is heated. Can you dissolve more sugar in it?
OUR HERITAGE
The salt we use at home is mainly obtained by separating it from sea water. This separation
tish. In British
Answers
Answer:
a) When we try to dissolve sugar in water, the sugar particles breaks down into even smaller particles and fill the gap between the molecules. Molecules cannot be seen with naked eye, as so the dissolved sugar cannot be seen when we dissolve it in water.
b) Sugar and salt are examples of soluble substances. Substances that do not dissolve in water are called insoluble. Sand and flour are examples of insoluble substances.
c)Saturated vs.
A saturated solution is a solution that contains as much solute as can dissolve in a given solvent at a given temperature. If you add more than 2000 grams of sugar to a liter of 20 °C water, the extra sugar won't dissolve.
d) yes, by heating and then, adding sugar into it.
Explanation:
Sea water contains many salts mixed in it. One of them is common salt, when sea water is allowed to stand in shallow pits, water gets evaporated by sunlight and slowly turns into water vapor. In a few days, the water evaporates completely leaving behind the solid salts. Common salt is then obtained from this mixture of salts by further purification.