Exercise 1 | The Atomic Theory

Classify each of the following as elements, compounds, heterogeneous mixture, or homogeneous mixture:

salt water


salt and sugar


carbon dioxide

diamond (C)

sodium chloride

oil and water


salt water: homogeneous mixture

silver: element

salt and sugar: heterogeneous mixture

air: homogeneous mixture

carbon dioxide: compound

diamond (C): element

sodium chloride: compound

oil and water: heterogeneous mixture

ice: compound