Download Chapter 8, part III

Chapter 8, part III
Word Equations
Word Problems
• 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.
• Don’t forget your diatomic elements—
their formula will be H2, N2, O2, F2, Cl2,
Br2,or I2.
• Then, balance as normal!
Here are some examples...
• 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.
• Propene (C3H6) and oxygen react to form
carbon dioxide and water..
• Aluminum hydroxide break down to form
aluminum oxide and water.
Balance these equations:
Lithium and oxygen yield lithium oxide.
4 Li + O2 a 2 Li2O
Hydrochloric acid and iron (III) oxide
react to form iron (III) chloride and water.
6 HCl + Fe2O3 a 2FeCl3 + 3H2O
Magnesium carbonate breaks down to form
magnesium oxide and carbon dioxide.
MgCO3 a MgO + CO2
Barium cyanide and sulfuric acid react to
form barium sulfate and hydrogen cyanide.
Ba(CN)2 + H2SO4 a BaSO4 + 2HCN
Calcium Iodide plus mercury (II) nitrate produces
calcium nitrate and mercury (II) iodide.
CaI2 + Hg(NO3)2 a CaNO3 + 2HgI
Aluminum and chlorine react to
form aluminum chloride
2Al + 3Cl2 a 2AlCl3
Silver plus hydrochloric acid yields
silver chloride and hydrogen.
2Ag + 2HCl a 2AgCl + H2
Ethyne (C2H2) and oxygen react to form
carbon dioxide and water.
2C2H2 + O2 a 4CO2 + 2H2O
Magnesium chloride breaks down to form
magnesium and chlorine
MgCl2 a Mg + Cl2