Question

Giovanni created this chart to study for an exam.

Answer 1

Calcium carbonate is indeed used as an antacid (among Mg(OH)2, Al2(OH)3 and NaHCO3).

Ferrous oxide or Iron (II) oxide is a dark substance, and I would certainly think twice before using a dark tooth paste (Yew! ) It might even rust if left in the mouth for some time!

Answer 2

Answer;

B) Swap the uses for iron oxide and calcium carbonate.

Explanation;

• 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.