Experiment 10 — Solution, Colloid or Suspension?

Topic: Chemistry · Class 9 · Is matter around us pure: mixtures and the Tyndall effect

Aim: Correctly classify the milk sample using the right test.

Daily: A beam of sunlight through a dusty window, headlights in fog, and the blue of the sky are all the Tyndall effect. Milk looks uniform but is not a true solution.

Question: A torch beam is shone through salt water and through milk. In which is the beam visible?

Exp: Colloidal particles scatter light (Tyndall effect); solution particles are too small.

Question: The Tyndall effect is the…

Exp: It makes a light beam visible.

Question: Which mixture settles on standing?

Exp: Its particles are largest.

Question: Cream is separated from milk by…

Exp: Spinning separates colloidal cream.

Exp: Tiny water droplets in air scatter light.