Question

1.List the points of differences between homogeneous and heterogeneous mixtures 2.To make a saturated solution, 40 g of sodium chloride is dissolved in 360 g of water at 293 K. Find its concentration in mass/mass percentage at this temperature. 3.Write any 2 properties of solutions?​

Answer 1

Answer:

1.List the points of differences between homogeneous and heterogeneous mixtures 2.To make a saturated solution, 40 g of sodium chloride is dissolved in 360 g of water at 293 K. Find its concentration in mass/mass percentage at this temperature. 3.Write any 2 properties of solutions?

Answer 2

Answer:

(i) butter from curd,

(ii) salt from sea-water,

(iii) camphor from salt.

Ans. (i) Centrifugation,

(ii) Evaporation,

(iii) Sublimation.

Q3. What type of mixtures are separated by the technique of crystallisation?

Ans. Crystallisation technique is used to purify solid with some impurities in it.

Example: Salt from sea-water.

NCERT TEXTBOOK PAGE 24

Q1. Classify the following as chemical or physical changes:

• cutting of trees,

• melting of butter in a pan,

• rusting of almirah,

•