Question

to form iron sulphide iron and sulpher needs to be heated why?​

Answer 1

Answer:

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. Therefore, heating of a mixture of iron and sulphur powder is a chemical change.

Answer 2

A mixture is a collection of substance that can be separated from the components that went into its creation.

Explanation:

• When the reaction mixture is heated, the sulphur melts and exothermically combines with the iron to generate iron (II) sulphide.
• Sulphur vapour is prevented from escaping and perhaps catching fire by the mineral wool stopper in the test tube's mouth.
• If the sulphur vapour does ignite despite these precautions, pupils should be taught how to put out the fire by placing a moist towel over the tube's mouth.
• Exothermic reactions are those that release energy, usually in the form of heat or light. Because the total energy of the products held is less than the total energy of the reactants released, energy is released during the reaction.