Question 30
Which among the following are physical or chemical changes?

(a) Evaporation of petrol.

(b) Burning of Liquefied Petroleum Gas (LPG).

(c) Heating of an iron rod to red hot.

(d) Curdling of milk.

(e) Sublimation of solid ammonium chloride.

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Solution

The physical changes involve change in the physical properties of a substance. The chemical changes involve change in the chemical properties of a substance.

(a), (c) and (e) — are physical changes.

(b) and (d) are chemical changes.

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Question 30
Which among the following are physical or chemical changes?

(a) Evaporation of petrol.

(b) Burning of Liquefied Petroleum Gas (LPG).

(d) Curdling of milk.

(e) Sublimation of solid ammonium chloride.

Q. Which among the following are physical or chemical changes?

(a) Evaporation of petrol
(b) Burning of liquefied Petroleum Gas (LPG)
(c) Heating of an iron rod to red hot.
(d) Curdling of milk
(e) Sublimation of solid ammonium chloride

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.

Is sublimation a chemical change or physical change? What about sublimation of ammonium chloride?

Ammonium chloride is also sublimable solid . Give a reason why sublimation of ammonium chloride involves a physical & Chemical change.

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Physical vs Chemical Changes

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Question 30 Which among the following are physical or chemical changes? (a) Evaporation of petrol. (b) Burning of Liquefied Petroleum Gas (LPG). (c) Heating of an iron rod to red hot. (d) Curdling of milk. (e) Sublimation of solid ammonium chloride.

The physical changes involve change in the physical properties of a substance. The chemical changes involve change in the chemical properties of a substance. (a), (c) and (e) — are physical changes. (b) and (d) are chemical changes.

Question 30
Which among the following are physical or chemical changes?

(a) Evaporation of petrol.

(b) Burning of Liquefied Petroleum Gas (LPG).

(c) Heating of an iron rod to red hot.

(d) Curdling of milk.

(e) Sublimation of solid ammonium chloride.

The physical changes involve change in the physical properties of a substance. The chemical changes involve change in the chemical properties of a substance.

(a), (c) and (e) — are physical changes.

(b) and (d) are chemical changes.