Which of the following do not exhibit Tyndall effect?

Starch solution, Sugar solution, Ink, Salt solution, Copper sulphate solution, Ammonium chloride solution, Fog, Smoke, Car exhausts.

Which of the following are physical changes and which are chemical changes?

Burning of candle wax, Melting of candle wax, Mixing of iron filings and sand, Burning of wood, Breaking a piece of chalk, Burning a piece of paper, Cutting a piece of paper

The ‘sea water’ can be classified as a homogeneous mixture as well as a heterogeneous mixture? Comment.

(a) What is a physical change? Give two examples of physical changes.

What is a chemical change?

Give two examples of chemical changes.