Chapter 8, part III Word Equations Predicting Products

Word Problems If given an equation in word format, the first step is to write the skeletal equation.If given an equation in word format, the first step is to write the skeletal equation. You do this by writing the symbol for the elements, and the formula for each compound.You do this by writing the symbol for the elements, and the formula for each compound. Don’t forget your diatomic elements— their formula will be H 2, N 2, O 2, F 2, Cl 2, Br 2,or I 2.Don’t forget your diatomic elements— their formula will be H 2, N 2, O 2, F 2, Cl 2, Br 2,or I 2. Then, balance as normal!Then, balance as normal!

Here are some examples... Lead (II) nitrate and potassium chromate react to form lead (II) chromate and potassium nitrate.Lead (II) nitrate and potassium chromate react to form lead (II) chromate and potassium nitrate. Chlorine and potassium iodide react to form potassium chloride and iodine.Chlorine and potassium iodide react to form potassium chloride and iodine. Propene (C 3 H 6 ) and oxygen react to form carbon dioxide and water.Propene (C 3 H 6 ) and oxygen react to form carbon dioxide and water. Aluminum hydroxide breaks down to form aluminum oxide and water.Aluminum hydroxide breaks down to form aluminum oxide and water.

Predicting Products Knowing the basic reaction types (combination, decomposition, etc.) you should be able to predict the products in simple reactions.Knowing the basic reaction types (combination, decomposition, etc.) you should be able to predict the products in simple reactions.

Let’s Predict... Mg + O 2 Mg + O 2  HgO HgO  Zn + HCl Zn + HCl  K 2 CO 3 + BaCl 2 K 2 CO 3 + BaCl 2  CH 4 + O 2 CH 4 + O 2 

Balance these equations:

Lithium and oxygen yield lithium oxide. 4 Li + O 2  2 Li 2 O

Hydrochloric acid and iron (III) oxide react to form iron (III) chloride and water. 6 HCl + Fe 2 O 3  2FeCl 3 + 3H 2 O

Magnesium carbonate breaks down to form magnesium oxide and carbon dioxide. MgCO 3  MgO + CO 2

Barium cyanide and sulfuric acid react to form barium sulfate and hydrogen cyanide. Ba(CN) 2 + H 2 SO 4  BaSO 4 + 2HCN

Sodium peroxide and water yield sodium hydroxide and hydrogen. Na 2 O 2 + H 2 O  NaOH + H 2

Iron (III) chloride and ammonium hydroxide produce iron (III) hydroxide and ammonium chloride. FeCl 3 + NH 4 OH + Fe(OH) 3 + NH 4 Cl

CaI 2 + Cu(NO 3 ) 2  CaI 2 + Cu(NO 3 ) 2  CaNO 3 + 2CuI

Al + Cl 2  2Al + 3Cl 2  2AlCl 3

Silver plus hydrochloric acid yields: 2Ag + 2HCl  2AgCl + H 2

Ethyne (C 2 H 2 ) and oxygen react to form: 2C 2 H 2 + O 2  4CO 2 + 2H 2 O

Magnesium chloride breaks down to form: MgCl 2  Mg + Cl 2