Question

What would you observe when a mixture of iron filings and sulfur is strongly heated?

Answer 1

Elements

An element is a pure substance that cannot be broken down by any physical or chemical means into simpler substances.

Example: Iron $\left(\mathrm{Fe}\right)$, sulphur $\left(\mathrm{S}\right)$

Compounds

Substances are made up of different kinds of atoms, where the atoms are chemically combined

Example: Iron sulfide $\left(\mathrm{FeS}\right)$

• Reactions are classified into exothermic and endothermic reactions
• The reaction which involves the liberation of heat is called an exothermic reaction whereas a reaction in which heat is absorbed is called an endothermic reaction
• Iron $\left(\mathrm{Fe}\right)$ and sulphur$\left(\mathrm{S}\right)$ are two elements, when they are heated together it forms a new compound called Iron sulfide $\left(\mathrm{FeS}\right)$ which involves the liberation of heat i.e exothermic reaction

It is given in the chemical reaction

${\mathrm{Fe}}_{\left(\mathrm{s}\right)}+{\mathrm{S}}_{\left(\mathrm{s}\right)}\to {\mathrm{FeS}}_{\left(\mathrm{s}\right)}$