By finding the boiling point of a given colourless liquid. If the liquid boils at 100°C at atmospheric pressure, then it is pure water. This is because pure substances have fixed melting and boiling point.
By finding the boiling point of a given colourless liquid. If the liquid boils at 100°C at atmospheric pressure, then it is pure water. This is because pure substances have fixed melting and boiling point.
Milk and starch solution. The Tyndall effect is the phenomenon in which the particles in a colloid scatter the beams of light that are directed at them. This effect is exhibited by all colloidal solutions and some very fine suspensions.
Milk and starch solution.
The Tyndall effect is the phenomenon in which the particles in a colloid scatter the beams of light that are directed at them. This effect is exhibited by all colloidal solutions and some very fine suspensions.
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
How would you confirm that a colourless liquid given to you is pure water?
By finding the boiling point of a given colourless liquid. If the liquid boils at 100°C at atmospheric pressure, then it is pure water. This is because pure substances have fixed melting and boiling point.
By finding the boiling point of a given colourless liquid. If the liquid boils at 100°C at atmospheric pressure, then it is pure water. This is because pure substances have fixed melting and boiling point.
See lessWhich of the following materials fall in the category of a “pure substance”? Ice, Milk, Iron, Hydrochloric acid, Calcium oxide, Mercury, Brick, Wood, Air.
Pure substances are: Ice, iron, hydrochloric acid, calcium oxide and mercury.
Pure substances are: Ice, iron, hydrochloric acid, calcium oxide and mercury.
See lessIdentify the solutions among the following mixtures. Soil, Sea water, Air, Coal, Soda water.
Solutions are: Sea water soda water and air.
Solutions are: Sea water soda water and air.
See lessWhich of the following will show “Tyndall effect”?
Milk and starch solution. The Tyndall effect is the phenomenon in which the particles in a colloid scatter the beams of light that are directed at them. This effect is exhibited by all colloidal solutions and some very fine suspensions.
Milk and starch solution.
The Tyndall effect is the phenomenon in which the particles in a colloid scatter the beams of light that are directed at them. This effect is exhibited by all colloidal solutions and some very fine suspensions.
See lessClassify the following into elements, compounds and mixtures. Sodium, Soil, Sugar solution, Silver, Calcium carbonate, Tin, Silicon, Coal, Air, Soap, Methane, Carbon dioxide, Blood.
Elements – Compounds – Mixtures Sodium – Calcium carbonate – Sugar solution Silver – Methane – Soil Tin – Carbon dioxide – Coal Silicon – Soap – Air ,Blood
Elements – Compounds – Mixtures
See lessSodium – Calcium carbonate – Sugar solution
Silver – Methane – Soil
Tin – Carbon dioxide – Coal
Silicon – Soap – Air ,Blood
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