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Q&A HomeClass 7CBSESciencePhysical and Chemical Changes
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Chapter 5

Physical and Chemical Changes

Science•Class 7•CBSE

13 Questions Available

Showing 13 questions on this page

1

Explain the process of rusting.

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2

Explain the changes occurring in burning of candle.

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3

Explain why burning of wood and cutting it into small pieces are considered as two different types of changes.

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4

Write the chemical formula of blue vitriol.

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5

What is a chemical change?

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6

Explain chemical reaction along with examples.

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7

How can we prevent rusting?

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8

State the condition necessary for the occurrence of any reactant.

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9

Explain physical reaction along with examples.

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10

Why new products are formed in a chemical reaction?

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11

Apart from new products, many other things accompany a chemical change, what are those things?

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12

Setting of curd is regarded as a chemical change, explain why?

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13

Which one is better technique to obtain sugar from sugar solution- crystallization or evaporation to dryness?

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