Cutting of trees→ Physical change Melting of butter in a pan → Physical change Rusting of almirah → Chemical change Boiling of water to form steam → Physical change Passing of electric current through water, and water breaking down into hydrogen and oxygen gas → Chemical change Dissolving common salRead more
Cutting of trees→ Physical change
Melting of butter in a pan → Physical change
Rusting of almirah → Chemical change
Boiling of water to form steam → Physical change
Passing of electric current through water, and water breaking down into hydrogen and oxygen gas → Chemical change
Dissolving common salt in water → Physical change
Making a fruit salad with raw fruits → Physical change
Burning of paper and wood → Chemical change
Which of the following are chemical changes?
Chemical changes are: (a) Growth of a plant (b) Rusting of iron (c) Cooking of food (d) Digestion of food (e) Burning of a candle
Chemical changes are:
(a) Growth of a plant
(b) Rusting of iron
(c) Cooking of food
(d) Digestion of food
(e) Burning of a candle
See lessTry segregating the things around you as pure substances or mixtures.
Pure substances—Water, bread, sugar and gold. Mixtures—Steel, plastic, paper, talc, milk and air.
Pure substances—Water, bread, sugar and gold.
See lessMixtures—Steel, plastic, paper, talc, milk and air.
Classify the following as chemical or physical changes:
Cutting of trees→ Physical change Melting of butter in a pan → Physical change Rusting of almirah → Chemical change Boiling of water to form steam → Physical change Passing of electric current through water, and water breaking down into hydrogen and oxygen gas → Chemical change Dissolving common salRead more
Cutting of trees→ Physical change
See lessMelting of butter in a pan → Physical change
Rusting of almirah → Chemical change
Boiling of water to form steam → Physical change
Passing of electric current through water, and water breaking down into hydrogen and oxygen gas → Chemical change
Dissolving common salt in water → Physical change
Making a fruit salad with raw fruits → Physical change
Burning of paper and wood → Chemical change
What type of mixtures are separated by the technique of crystallization?
Crystallisation technique is used to purify solid with some impurities in it. Example: Salt from sea-water.
Crystallisation technique is used to purify solid with some impurities in it. Example: Salt from sea-water.
See lessName the technique to separate camphor from salt.
Sublimation.
Sublimation.
See less