a. Boiling water in the water bath (i) What kind of change did you observe, phys

ID: 890196 • Letter: A

Question

a. Boiling water in the water bath

(i) What kind of change did you observe, physical or chemical?

(ii) Give reasoning for your answer above.

(iii) Write a balanced chemical equation for the change.

(iv) If it was a chemical change, identify the type of the reaction.

b. Heating a hydrous salt to obtain an anhydrous salt.

(i) Was it physical or chemical transformation?

(ii) Give reasoning for your answer above.

(iii) Write a balanced chemical equation for the change.

(iv) If it was a chemical change, identify the type of the reaction.

a) Boiling of water in water bath

It is a physical chage because the water is converting from liquid state to gaseous state i.e., vapour state.

H2O (l) -----------> H2O (g) dH = +ve value since energy is required for the convertion of liquid to gaseous state.

b) Heating a hydrous salt to obtain an anhydrous salt

It is also a physical change because the water molecules are seperated from salt.

CuSO4 . 5 H2O ------------> CuSO4 + 5 H2O

Hydrated salt above is blue in colour and anhydrous is colourless.

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