Which of the following is a physical change?
i. Burning of magnesium
ii. Dissolving of sugar in water
iii. Formation of compound from its element
iv. Rusting of iron

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Solution

$(i)$ Burning of magnesium can be shown by the reaction,
$M g + O_{2} ⟶ M g O$ $-$ It is a $chemical change$
$(i i)$ It is $physical change$ , as there is no formation of any new substances. This change can be reversed.
$(i i i)$ $Chemical change$ as new compound is formed from its element.
$(i v)$ Rusting is a $chemical change$ since rust is formed (a new substance).

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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.

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

(a) Burning of a magnesium wire

(b) Freezing of water

(d) Glowing of an electric bulb

Q. Group the following into physical change and chemical change.

Dissolving salt in

H_{2} O,

burning of a fuel, rusting or iron, melting of ice cube.

Question 1

Which of the following is a physical change?
(a) Rusting of iron
(b) Combustion of magnesium ribbon
(c) Burning of candle
(d) Melting of wax

Write the difference between :

a) burning of magnesium ribbon and burning of candle.

b) Rusting of iron and burning.

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Which of the following is a physical change?i. Burning of magnesiumii. Dissolving of sugar in wateriii. Formation of compound from its elementiv. Rusting of iron

Which of the following is a physical change?
i. Burning of magnesium
ii. Dissolving of sugar in water
iii. Formation of compound from its element
iv. Rusting of iron