Question

Alan has powdered iron and powdered sulphur in two beakers. A/an _______ is formed if he mixes both of them together at room temperature.

• A. compound
• B. element
• C. pure substance
• D. heterogeneous mixture

Answer 1

The correct option is D heterogeneous mixture

When powdered iron $\left(\text{Fe}\right)$ and sulphur $\left(\text{S}\right)$ are mixed together at room temperature they form a heterogeneous mixture as they do not chemically combine with each other at this temperature.

However, when this mixture is heated, they combine together chemically, to form iron sulphide $\left(\text{FeS}\right)$ as shown below.
$\mathrm{Fe}\left(s\right)+S\left(s\right)\stackrel{\mathrm{Heat}}{\to }\mathrm{FeS}\left(s\right)$