Question

Practical No. 3
Aim: To observe the following reactions and to classify them into the typos combination,
displacement, decomposition and double displacement.
Reaction :
1. Reaction of water with (Calcium Oxide) lime.
2. Effect of heat on ferrous sulphate.
3. Reaction of copper sulphate solution with iron nail.
4. Reaction of solutions of sodium sulphate and barium chloride with each other.
Apparatus : 250 ml beaker, china dish, asbestos sheet, dropper, hard glass test tube, test tube
holder, test tube stand, sand paper, burner / spirit lamp, filter paper etc.
Chemicals : Calcium oxide, water, crystals of ferrous sulphate, iron nail / wire scrubber, solution
of copper sulphate.
Procedure :
entity
A. Reaction of water with slaked lime.
1. Take about 10 gm lime in a clean and dry china dish, place this dish on an asbestos sheet.
2. Take a little water in a beaker, using dropper sprinkle some water on the lime in the dish.
Record your observations.
Obsertvations
Observation :
Sr.No. Experimental procedure
1 Note the heat absobed or evolved during
the reaction by touching the dish.
2 Note whether a gas or vapour is given
away in the reaction.
3 Note the noise, if any, produced during
the reaction.
4. Note the change in the physical state
with​

Answer 1

1) the heat absorbed or evolved is absorbed.

2) vapour is released in this reaction.

3)no noise is produced.

4) it is a physical change.