Question

A mixture of sulphur powder and iron filings and heated to make compound list you are observing the stages

Answer 1

ferrous sulphide. don't attract to magnet

Answer 2

Answer:

Explanation:

When iron filings and sulphur powder are mixed and heated they undergo a chemical reaction and form ferrous sulphide (FeS). It is a new substance which has properties entirely different from Fe and S.

Compound

Click on the knob of the burner to turn it on.

Gas bubbles are produced in the test tube that then passes through the bent tube into the test tube on the rack thus forming a black precipitate.

Observations and Inference:

SI.No Experiment Observations

1. Observation with naked eye, i.e., appearance Yellow powder in which some iron filing is visible, i.e., heterogeneous. On heating A, B is obtained which is black in colour. No iron filings visible, i.e., homogeneous. Iron and sulphur powder retain their properties in A. In B, iron and sulphur both loose their properties due to the reaction

Fe + S-> FeS

Iron +Sulphur -> Ferrous sulphide.

2. Behaviour towards a magnet. Iron filings cling to magnet. No particle attaches to magnet. In A, iron retains its properties. In B, iron has lost its properties.

3. Behaviour towards carbon disulphide (CS2 - a solvent). Sulphur dissolves first and reappears after some time. No change is observed. In A, sulphur retains its properties. In B, sulphur has lost its original properties after reaction with Fe.

4. Effect of heat A black mass is obtained which is homogeneous. No change. Mixture of iron filings and sulphur powder forms compound FeS on heating.

Compound FeS does not show any reaction on heating.

5. Effect of heating with dil.HCl On heating, a gas is formed. On bringing the glowing match stick near the mouth of the test tube, the flame dips out producing a popping sound and with a mild explosion. On heating, a gas is evolved. On passing the gas through copper sulphate solution, a black precipitate is formed. In A iron reacts with dil. HCl to form hydrogen gas which extinguishes the burning match stick with a mild explosion and producing a popping sound. In B, the compound FeS react with dil. HCl to produce H2S gas which reacts with copper sulphate solution to form a black precipitate of copper sulphide.

FeS (s) + 2HCl (aq) --> FeCl2 (aq) + H2S (g)

CuSO4 (aq) + H2S (g) --> CuS (s) + H2SO4 (aq)

Result:

When iron filings and sulphur powder are mixed, both retain their properties. It means they have not undergone any chemical reaction.