Try segregating the things around you as pure substances or mixtures.
Pure substances—copper wire, water, sugar, salt, etc.
Mixtures—fruits, furniture, paper, clothes, food, butter, shoes, vegetables, toothpaste, etc.
What is meant by a substance?
A substance which consists of a single type of particle and it cannot be separated into other kinds of matter by any physical process is called a substance.
Which of the following are chemical changes?
Growth of a plant, Rusting of iron, Mixing of iron filings and sand, Cooking of food, Digestion of food, Freezing of water, Burning of candle.
Chemical changes are:
i) Rusting of iron
ii) Cooking of food
iii) Digestion of food
iv) Burning of candle.
List the points of differences between homogeneous and heterogeneous mixtures.
|
Homogeneous mixture |
Heterogeneous mixture |
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It is the mixture in which different constituents are mixed uniformly. |
It is the mixture in which different constitutes are not mixed uniformly |
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They cannot have physically distinct parts. |
They have physically distinct parts. |
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The constituents cannot be easily seen. |
The constituents can be easily seen. |
|
The constituents cannot be easily separated. |
The constituents can be easily separated. |
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Example: sugar solution, soda water, soft drinks, vinegar, air etc. |
Example: sugar and sand mixture, milk, ink, paint, etc. |
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