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7th Andhra Pradesh Board
IMPORTANT
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Add few drops of sulphuric acid to a copper sulphate solution. Do you observe any change in colour?

Important Questions on Changes Around Us

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7th Andhra Pradesh Board
IMPORTANT
Science Class VII>Chapter 17 - Changes Around Us>EXERCISE>Q 1
Add iron nails to an acidic copper sulphate solution. Remove the nails after sometimes. Is there any change in the colour of the solution that had iron nail in it?
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7th Andhra Pradesh Board
IMPORTANT
Science Class VII>Chapter 17 - Changes Around Us>EXERCISE>Q 2
Add iron nails to an acidic copper sulphate solution. Remove the nails after sometimes. Is there any change in the nail?
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7th Andhra Pradesh Board
IMPORTANT
Science Class VII>Chapter 17 - Changes Around Us>EXERCISE
What type of change is the formation of sugar crystals?
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7th Andhra Pradesh Board
IMPORTANT
Science Class VII>Chapter 17 - Changes Around Us>EXERCISE
Dissolve some urea in water in a test tube until saturation. Cool down the solution for about half an hour. Do you find any crystals in the solution? What is the shape of the crystal?
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7th Andhra Pradesh Board
IMPORTANT
Science Class VII>Chapter 17 - Changes Around Us>EXERCISE
Compare the type of crystals formed by Urea and Alum?
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7th Andhra Pradesh Board
IMPORTANT
Science Class VII>Chapter 17 - Changes Around Us>EXERCISE
Have you ever thought of the process behind setting milk into curd? Is it a physical change or a chemical change?
EASY
7th Andhra Pradesh Board
IMPORTANT
Science Class VII>Chapter 17 - Changes Around Us>EXERCISE
What type of change is the boiling of an egg? Is it a chemical change or a physical change?
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7th Andhra Pradesh Board
IMPORTANT
Science Class VII>Chapter 17 - Changes Around Us>EXERCISE>Q 1
Think about the following change and decide whether it is a physical or a chemical change. Also write the reason to support your answer:

Preparation of idly mix.