Question 10

Two drops of dilute sulphuric acid were added to 1 g of copper sulphate powder and then small amount of hot water was added to dissolve it (step I). On cooling, beautiful blue coloured crystals got separated (step II). Step I and step II are:
(a) physical and chemical changes respectively
(b) chemical and physical changes respectively
(c) both physical change
(d) both chemical change

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Solution

Step I and Step II are both physical change. Hence option (c) is the correct answer.

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Q. Two drops of dilute sulphuric acid were added to 1 g of copper sulphate powder and then a small amount of hot water was added to dissolve it (step I). On cooling, beautiful blue coloured

crystals got separated (step II). Step I and step II are:

Q. Two drops of dilute sulphuric acid were added to

1 g

of copper sulphate powder and then a small amount of hot water was added to dissolve it (step

I

). On cooling, beautiful blue-coloured crystals got separated (step

I I

). Step

I

and step

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Question 8

Paheli’s mother made a concentrated sugar syrup by dissolving sugar in hot water. On cooling, crystals of sugar got separated. This indicates a:
(a) physical change that can be reversed
(b) chemical change that can be reversed
(c) physical change that cannot be reversed
(d) chemical change that cannot be reversed

Q. (a) During photosynthesis, green plants prepare glucose with the help of carbon dioxide from the air and water from the soil. Is photosynthesis a physical change or a chemical change? Justify your answer.
(b) Copper sulphate is a blue coloured chemical. When it is heated, the blue colour disappears and it turns white. After is cools, if a few drops of water are put into the test tube, the copper sulphate turns blue again. Is this a physical or a chemical change?

Four students have their own opinion about reversible and irreversible changes. Who among the following is correct?

Rohan: Both physical and chemical changes are reversible.

Sam: Both physical and chemical changes are irreversible.

Tom: Physical changes are irreversible and chemical changes are reversible.

Riah: Chemical changes are irreversible and physical changes are reversible

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