Aim: How do chemists classify types of chemical reactions? Law of Conservation of Mass- matter is neither created nor destroyed in chemical reactions. What are the implications of this law? The numbers and kinds of atoms must remain unchanged in the reaction (only rearranged.)

Aim: How do chemists analyze “redox” reactions? Synthesis (Combination) Reactions-When two or more reactants combine to form a single product. 2Cu(s) + O2(g) 2CuO(s) 4Fe(s) + 3O2(g) 2Fe2O3(s)

Aim: How do chemists classify types of chemical reactions? Decomposition (Analysis) Reactions- A single compound is broken down into two or more simpler substances. CaCO3(s) CaO(s) + CO2(g) 2H2O(l) 2H2(g) + O2(g)

Aim: How do chemists classify types of chemical reactions? Single Replacement Reactions- Type of reaction where one element replaces another element in a compound. Always involves an element and a compound. Cu(s) + 2AgNO3(aq) Cu(NO3)2(aq) + 2Ag(s) Can the reverse reaction take place? Refer to Table J “Activity Series.” Rule: A metal listed on the table will react with the compound of a metal below it.

Aim: How do chemists classify types of chemical reactions? Double Replacement Reactions- Involve two soluble ionic compounds that react in solution to produce a precipitate, a gas, or a molecular compound such as water. AgNO3(aq) + NaCl(aq) AgCl(s) + NaNO3(aq)

Aim: How do chemists classify types of chemical reactions? How to determine if two ionic compounds will react? A reaction will occur if one of the products is a solid (precipitate.) Check “Solubility Guidelines.” A reaction will occur if one of the products is a gas. A reaction will occur if a molecular substance such as water is formed.