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.

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Solution

Physical change
Chemical change
1) Dissolving salt in $H_{2} O$
1) Burning of a fuel
2) Melting of ice cube
2) Rusting of iron

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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

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

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

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• Dissolving common salt in water

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So, rusting of iron is a chemical change or physical change???

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

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Physical change	Chemical change
1) Dissolving salt in $H_{2} O$	1) Burning of a fuel
2) Melting of ice cube	2) Rusting of iron

Group the following into physical change and chemical change. Dissolving salt in H2O, burning of a fuel, rusting or iron, melting of ice cube.

Physical changeChemical change 1) Dissolving salt in H2O1) Burning of a fuel2) Melting of ice cube2) Rusting of iron

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.

Physical change
Chemical change
1) Dissolving salt in $H_{2} O$
1) Burning of a fuel
2) Melting of ice cube
2) Rusting of iron