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

Classify the following as physical or chemical changes:

(i) Formation of curd from milk

(ii) Condensation of steam

(iii) Growth of a plant

(iv) Breaking of a glass tumbler

Separate the following into physical and chemical changes:

Sublimation of a solid, Decomposition of water into hydrogen and oxygen by passing electric current,

Formation of clouds, Making a fruit salad from raw fruits, Dissolving carbon dioxide in water.

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

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.