Which of the following is physical change?
Ripening of fruit
Grinding of wheat to make flour
Cooking of rice
None of these
Sort the following according to their physical and chemical changes.
(i) Combustion of wood
(ii) Melting of ice.
(iii) Cooking of food.
(iv) Rusting of iron.
(v) Ripening of fruits.
(vi) Tearing of papers.
Question 4
(c) Classify the following processes into physical or chemical changes. baking of bread, switching of an electric bulb, curdling of milk, dissolving sodium chloride in water, photosynthesis, rusting of iron, evaporation of water, formation of dew, sublimation of camphor, burning of charcoal or LPG, clotting of blood, crystallization of sugar, ripening of fruit, cooking of vegetables, melting of wax.
State the type of changes taking place in the following examples.
(vi) Tearing of papers