TYPES OF CHEMICAL REACTIONS Types of synthesis reactions Defn: Synthesis Reaction- Two or more substances combine to form a new compound. A +X -> AX Types of synthesis reactions Oxygen and Sulfur -both react with groups 1 and 2 to form oxides and sulfide -almost all metals react with oxygen -most non-metals react with oxygen in synthesis reactions Metals and Halogens: -most metals react with halogens in a synthesis reaction -oxides in reactive metals undergo synthesis. Example calcium oxide and water.

Types of single displacement Defn. Decomposition Reaction: A single compound undergoes a reaction that produces two or more simple substances. AX -> A + X Defn. Electrolysis: decomposition of a substance by an electric current. Example water. Defn. Single Displacement: One element replaces a similar element in a compound. A + BX -> B + AX or A + BX -> X + AB Types of single displacement 1. Displacement of a metal with another metal 2. Displacement of hydrogen in water by a metal 3. Displacement of hydrogen in an acid by a metal 4. Displacement of a halogen by a more reactive halogen

Defn. Double Displacement: The ions of two compounds exchange places in an aqueous solution to form a new compound. AX + BY  AY + BX This is what usually forms a precipitate or gas bubble. Defn. Combustion Reaction: A substance combines with oxygen releasing a large amount of energy in the form of heat and light. Reaction types: Synthesis Decomposition Single displacement Double displacement Combustion