1What is the name of a substance formed when two or more substances come together physically, and what are the substances that form it called?
2Write the difference between a homogeneous mixture and a heterogeneous mixture.
3Write the difference between a solvent and a solute.
4Give the reason why a sugar solution is called a homogeneous mixture.
5Give the reason why a mixture of different colours is separated by chromatography.
6Give the reason why centrifuging is used to separate light and heavy substances in a mixture of a liquid and a solid.
7Give the reason why evaporation is used to separate salt from a salt solution.
8Of muddy river water and salt water, which is called a heterogeneous mixture? Give your reasoning.
9What property must a mixture have for it to be separated by distillation?
10Where is centrifuging used, and why?
11Which method would you use to separate the different chemicals present in blood? Give your reason.
12Discuss where solutions are used in our daily life.
13You are given one glass of salt water and one glass of pure water. Without tasting them, how would you find out which is the pure water, using a method of separating mixtures?
14When salt water is heated, why does all the water go away and only the salt stay in the pan?
15Why does the butter float on top of the buttermilk when curd is churned?
16Can a mixture of water and another liquid that boils before water does be separated by distillation?
17Why is milk called a colloid rather than a homogeneous mixture?
18Of water with chalk dust in it and water with sugar in it, which one can be strained with filter paper, and why?
19What is the difference between evaporation and distillation?