#___ Writing chemical equations: AP Worksheet
Write balanced equations for the following reactions. Include state symbols.
Use (s) for anything listed as a solid, any metal (other than Hg) and any Ionic compound will be solid unless otherwise noted.
Use (l) for anything listed as liquid or molten (Hg and Br are liquid at room temperature and only compounds that are covalent
will be liquid)
Use (g) for anything listed as a gas or vapor. This will be any element with a red symbol and only compounds that are covalent
will be gases. (Also water is a vapor when involved in a combustion or explosive reaction).
Use (aq) for anything that is listed as aqueous, a solution, dissolved or diluted in water, or if it is a soluble ionic compound in a
DD or SD reaction (you won’t know this –yet!)
Don’t forget to balance charges for any ionic compound!!!!
1. Iron (III) oxide reacts with carbon monoxide gas to form pure, molten iron and carbon dioxide gas.
2. Potassium oxide reacts with water to produce a solution of potassium hydroxide (aq).
3. Carbon dioxide and water react during photosynthesis to form solid glucose (C6H12O6) and oxygen.
4. A sodium sulfate solution and a barium phosphate solution react to form aqueous sodium phosphate and a solid precipitate
of barium sulfate.
5. Ammonium nitrate can decompose explosively to form nitrogen, water vapor and oxygen.
6. Liquid octane (C3H8) combines with oxygen during combustion to produce carbon dioxide gas and steam (aka water vapor).
7. The combination of sodium metal and chlorine gas yields sodium chloride.
8. Magnesium metal reacts with an aqueous solution of ethanoic acid (aka acetic acid: HCH3COO) to form an aqueous solution
of magnesium ethanoate Mg(CH3COO)2 and hydrogen gas.
9. The decomposition of copper (II) nitrate yields copper (II) oxide, nitrogen dioxide gas and oxygen gas.
10. Mercury and oxygen react to form mercury (II) oxide.
11. Magnesium metal and steam combine to form solid magnesium hydroxide and hydrogen gas.
12. An aqueous solution of hydrogen peroxide (H2O2) and lead (II) sulfide combine to form lead (II) sulfate and water.
13. Sodium reacts with water to produce aqueous sodium hydroxide and hydrogen gas.
14. Zinc reacts with a solution of silver nitrate to produce silver and aqueous zinc nitrate.
15. Aqueous aluminum sulfate reacts with a calcium chloride solution to produce aqueous aluminum chloride and a solid
precipitate of calcium sulfate.
16. Potassium hydroxide pellets decompose on heating to form potassium oxide and water.