 Write skeleton equations from the following word equations AND balance them: ◦ In water, iron (III) chloride reacts with sodium hydroxide producing solid iron (III) hydroxide and sodium chloride

Pg. 63

 When two elements combine to form one new compound  2 reactants  single product ◦ Can be single elements or compounds  A + B  AB  Ex. 2Na + Cl 2  2NaCl  Ex. CaO + H 2 O  Ca(OH) 2  Ex. 2SO 2 + O 2  2SO 3

 When one compound breaks down to form two new products  Often require an energy source  1 reactant  2 products  AB  A + B  Ex. 2NaN 3  2Na + 3N 2

 Oxygen combines with a substance (usually a organic compound also called hydrocarbons) to form water and CO 2  Ex. CH 4 + 2O 2  2H 2 O +CO 2  Y Y

 Atoms of one element replace the atoms of another element  Not all metals react; use activity series list to predict reactivity  A metal can replace a metal that is below it on the a.s. but not above it (same for halogens)  AB + C  CB +A  Ex. 2Li + H 2 O  2LiOH + H 2

 An exchange of ions between two compounds  AX + BY  AY +BX  Ex. 2NaOH + CuCl 2  2NaCl + Cu(OH)  Most double replacement reactions result in the formation of a precipitate (a solid)

 A catalyst is something that is used to speed up a chemical reaction  Can be heat, stirring, or another element or compound  It is written above the yields arrow  Use delta (Δ ) to represent heat  Ex.

 C 3 H 8 + O 2  CO 2 + H 2 O  Mg + Cl  MgCl 2  ZnSO 4 + Mg  MgSO 4 + Zn  LiBr  Li + Br  FeCl 2 + MgS  FeS + MgCl