Identify whether the change is a physical or chemical change? Give a reason for your answer.
Anhydrous copper sulphate (white in colour) turns blue,when a drop of water is poured over it.

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Solution

Anhydrous copper sulphate (white) turns blue when a drop of water is poured over it - It is a chemical change.
Reason - The water molecules attach loosely to the molecules of copper sulphate. The change can be reversed by heating.

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Similar questions

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?

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

Identify whether the change is a physical or chemical change? Give a reason for your answer.

A rock rolls down a hill slop.

_{A drop of water is poured over a white powdery substance. Then it is observed that the substance turns blue. Answer the following questions :}

_{(i) What is the white powdery substance?}

_{(ii) Why does the substance change to blue colour?}

_{(iii) Write the chemical formula of the blue substance .}

_{(iv) Is the blue substance an acidic salt or a basic salt?}

_{(v) Give a reason for your answer in (iv).}

Identify whether the change is a physical or chemical change? Give a reason for your answer.

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Identify whether the change is a physical or chemical change? Give a reason for your answer.Anhydrous copper sulphate (white in colour) turns blue,when a drop of water is poured over it.

Anhydrous copper sulphate (white) turns blue when a drop of water is poured over it - It is a chemical change.Reason - The water molecules attach loosely to the molecules of copper sulphate. The change can be reversed by heating.

Identify whether the change is a physical or chemical change? Give a reason for your answer.
Anhydrous copper sulphate (white in colour) turns blue,when a drop of water is poured over it.

Anhydrous copper sulphate (white) turns blue when a drop of water is poured over it - It is a chemical change.
Reason - The water molecules attach loosely to the molecules of copper sulphate. The change can be reversed by heating.