1. 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.

2. 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

3. 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