Question

Match the given substances with their specific category.

• A. Iron
• B. Salt water
• C. Oil and water

Answer 1

$\bullet$ A pure substance is a material that is made up only one component. Iron is a pure substance because it is only made up of iron particles.
$\bullet$ A mixture is made up of two or more different components. They are classified as homogeneous and heterogeneous.
$\bullet$ A homogeneous mixture has uniform composition throughout, e.g. salt in water.
$\bullet$ A heterogeneous mixture has non uniform composition, e.g. oil in water, where oil floats on water.