Question

Procedure
:
Make a list of all the mixture that you use in your daily life.
S.No.
Substance
Solution/Colloid/Suspension
Basis of classification
1.
Lemonade
Solution
Cannot see the particles and cannot
seperate them by filtration.
2.
3.
4.
5.
6.
7.
8.
9.
10.​

Answer 1

Answer:

Depending upon the nature of the components that form a mixture, we can have different types of mixtures.

Activity : 1

Let us divide the class into groups A, B, C and D.

• Group A takes a beaker containing 50 mL of water and one spatula full of copper sulphate powder.

• Group B takes 50 mL of water and two spatula full of copper sulphate powder in a beaker.

• Groups C and D can take different amounts of copper sulphate and potassium permanganate or common salt (sodiumchloride) and mix the given components to form a mixture.

• Report the observations on the uniformity in colour and texture.

Observations:

• Groups A and B have obtained a mixture which has a uniform composition throughout. Such mixtures are called homogeneous mixtures or solutions. Some other examples of such mixtures are: (i) salt in water and (ii) sugar in water. Compare the colour of the solutions of the two groups. Though both the groups have obtained copper sulphate solution , the intensity of colour of the solutions is different. This shows that a homogeneous mixture can have a variable composition.

• Groups C and D have obtained mixtures, which contain physically distinct parts and have non-uniform compositions. Such mixtures are called heterogeneous mixtures. Mixtures of sodium chloride and iron filings, salt and sulphur, and oil and water are examples of heterogeneous mixtures.

Activity: 2