Science chapter10

Answer very briefly. 

1. Differentiate between absorption and adsorption. 

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2. Define Sublimation. 

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3. A few drops of ‘Dettol’ when added to water the mixture turns turbid. Why? 

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4. Name the apparatus that you will use to separate the components of mixtures containing two, 

i.  miscible liquids, 

ii. immiscible liquids. 

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5 Name the components in each of the following mixtures. 

i. Ice cream 

ii. Lemonade 

iii. Air 

iv. Soil

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Answer briefly. 

1. Which of the following are pure substances? Ice, Milk, Iron, Hydrochloric acid, Mercury, Brick and Water. 

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2. Oxygen is very essential for us to live. It forms 21% of air by volume. Is it an element or compound?

 

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3. You have just won a medal made of 22-carat gold. Have you just procured a pure substance or impure substance? 

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4. How will you separate a mixture containing saw dust, naphthalene and iron filings? 

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5. How are homogenous solutions different from heterogeneous solution? Explain with examples.

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Answer in detail. 

1. Write the differences between elements and compounds and give an example for each. 

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2. Explain Tyndall effect and Brownian movement with suitable diagram. 

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3 .How is a mixture of common salt, oil and water separated? You can use a combination of different methods.

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