Science, asked by jdsbcdb, 1 year ago

Please Solve Q7 & 8 I Will Mark U As Brainliest.

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Answered by Anshuman3874
4
8. Crystals of copper sulphate is prepared by
●) Take a clean beaker of 250 ml and put the powdered sample of copper sulphate in it.
●) Make the solution more clearly by adding 2-3 drops of concentrated sulphuric acid and heat up 70°c then add more copper sulphate until no more of it dissosves.
7.Burning of wood and cutting into small pieces are different changes because when we burn a wood the chemical composition takes place when we burn and when a wood i cutted into small pieces there no chemical composition takes place.Hence burning of wood is chemical change whereas cutting of wood into small pieces is physical change.
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Answered by viratkohli36182
0
Q7) Burning of food leads to information of coal.

This is a physical change.

When we cut the wood, the size and shape of the wood changes but no new substance is formed.

This is a physical change.

Q8) A cup of water is taken in a beaker and few drops of dilute sulphric acid is added.

The water is heated to boiling point and copper sulphate powder is added with continous stirring.

This is added untill the solution becomes satuararted.

This solution is then filtered and poured into china dish. It is left to cool and kept undisturbed.

Slowly the Crystals of copper sulphate start forming. This method is called Crystallisation.

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