Practice!

Sample Problem

Aluminum + Hydrochloric acid → Aluminum chloride + Hydrogen

Which of the following chemical reactions correctly interprets the chemical word equation above?

Solution

Aluminum is Al. Hydrochloric acid is HCl. Aluminum chloride is AlCl3. Hydrogen is H2.The correct equation is 2Al(s) + 6HCl (aq) → 2AlCl3(s) + 3H2 (g).