Law of Conservation of Mass Matter and Mass is neither created nor destroyed during a chemical reaction Products in a chemical reaction must have the same mass as the reactants  What I start with is what I finish with Mass reactants = Mass products

Types of Chemical Equations

5 Types of Chemical Equations 1. Synthesis Reactions 2. Combustion Reactions 3. Decomposition Reactions 4. Single Replacement Reactions 5. Double Replacement Reactions

1. Synthesis Reactions Two or more substances (A and B) react to produce a single product (AB) A + B  AB Real life example = ?

2. Combustion Reactions Oxygen combines with a substance and releases energy in the form of heat and light C x H y + O 2  CO 2 + H 2 O + light + heat Real life example = ?

3. Decomposition Reactions A single compound breaks down into two or more elements or new compounds AB  A + B Real life example = ?

4. Single Replacement Reactions The atoms of one element replace the atoms of another element A + BX  AX + B A metal can replace any metal listed below it that is in a compound. It cannot replace any metal listed above it. A more reactive halogen replaces a less reactive halogen Real life example = ?

5. Double Replacement Reactions An exchange of ions between two compounds They all produce either water, a precipitate, or a gas AX + BY  AY + BX Real life example = ?

Type of Reaction ReactantsProbable ProductsGeneric Equation SynthesisTwo or more substances One compoundA + B  AB Combustion A metal and oxygen A nonmetal and oxygen A compound and oxygen The oxide of the metal The oxide of the nonmetal Two or more oxides A + O 2  AO DecompositionOne compoundTwo or more elements and or compounds AB  A + B Single replacement A metal and a compound A nonmetal and a compound A new compound and the replaced metal A new compound and the replaced nonmetal A + BX  AX + B Double replacement Two compoundsTwo different compounds, one of which is a solid, water or a gas AX + BY  AY + BX