Report

EXPERIMENT-1

CHEMICAL REACTIONS

AIM:

To perform and observe the following reactions and classify them into:

(i) Combination reaction (action of water on quick lime)

(ii) Decomposition reaction (action of heat on ferrous sulphate crystals)

(iii) Displacement reaction (iron nails kept in copper sulphate solution)

(vi)Double decomposition reaction (reaction between sodium sulphate and barium chloride)

APPARATUS REQUIRED:

1. A rack of at least six clean test tubes and a boiling tube (hard glass test tube)

2. Two 100 cc beakers

3. A test tube holder

CHEMICALS REQUIRED:

1. Small pieces of quicklime (CaO) in crystal form and not in powder form

2. Ferrous sulphate crystals

3. Copper sulphate solution

4. Iron filings

5. Sodium sulphate solution

6. Barium chloride solution

7. Distilled water

8. Acidified potassium dichromate paper

1. (A) PROCEDURE i) Take a clean and dry 100 cc beaker and in it. Place small pieces of quick lime. ii) Fill a dropper with water and pour about 5 cc of it in the beaker. Make your observations.

(B) OBSERVATIONS:

i) As soon as the water comes in contact with the quick-lime, it starts crumbling producing a sort of crackling noise. It gives off steamy vapour. ii) The beaker on touching is found very hot. (C) CONCLUSIONS:

i) The reaction between quick-lime and water is exothermic in nature. That is the reason why steamy fumes are given out. The reaction can be represented by the following equation:

CaO (s) + H2O (l) ( Ca(OH)2 (aq) + heat(∆)

The reaction is a combination reaction.

2. (A) PROCEDURE

i) Take some ferrous sulphate crystals in a dry and clean boiling tube. ii) Introduce the boiling tube into the non-luminous flame, such that the mouth of tube is facing away from you. iii) Tiny droplets of a colorless liquid settle near the neck of the