Classify the following examples into physical or chemical change. [1 MARK]

1) Photosynthesis and burning of coal

2) Dissolving sugar in water and melting of wax

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Solution

Physical and chemical change: [0.5 Marks each]

1) Photosynthesis and burning of coal $\to$ Chemical change.

2) Dissolving sugar in water and melting of wax $\to$ Physical change.

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Similar questions

Classify the changes involved in the following processes as physical or chemical changes:

(a) Photosynthesis

(b) Dissolving sugar in water

(d) Melting of wax

(e) Beating aluminium to make aluminium foil

(f) Digestion of food

Classify these changes into physical and chemical changes. [5 MARKS]

S.No	Change
1	Melting of Ice
2	Dissolving sugar in water
3	Burning rubber
4	Burning camphor
5	Melting Wax

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.

Classify the following as a physical or a chemical change :

(a) Drying of wet clothes

(b) Manufacture of salt from seawater.

(d) Boiling of water

(e) Burning of paper

(f) Melting of wax

(g) Burning of coal

Classify the following as chemical or physical changes:

• Cutting of trees

• Melting of butter in a pan

• Rusting of almirah

• Boiling of water to form steam

• Passing of electric current through water, and water breaking down into hydrogen and oxygen gas

• Dissolving common salt in water

• Making a fruit salad with raw fruits

• Burning of paper and wood

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Classify the following examples into physical or chemical change. [1 MARK] 1) Photosynthesis and burning of coal 2) Dissolving sugar in water and melting of wax

Physical and chemical change: [0.5 Marks each] 1) Photosynthesis and burning of coal → Chemical change. 2) Dissolving sugar in water and melting of wax → Physical change.

Classify the following examples into physical or chemical change. [1 MARK]

1) Photosynthesis and burning of coal

2) Dissolving sugar in water and melting of wax

Physical and chemical change: [0.5 Marks each]

1) Photosynthesis and burning of coal $\to$ Chemical change.

2) Dissolving sugar in water and melting of wax $\to$ Physical change.