B) Swap the uses for iron oxide and calcium carbonate.
- Calcium carbonate is a compound that is naturally found in marble, chalk and limestone. It is used in pharmaceutical applications as a cost effective dietary calcium supplement, and also used in antacids.
- Calcium carbonate is also found in products such as baking powder, tooth paste, and wine among others.
- Iron oxides are compounds of iron that are used as coloring agents in some cosmetics. The forms of iron oxides used in cosmetics are normally synthetic.