1. Unit 5: Reaction Types Notes

2. 1. Synthesis Reaction 2 elements form a larger compound Example:A + B  AB 2Na + Cl 2  2 NaCl * The product is more complex than the reactant

3. 2. Decomposition Reaction Reactant breaks apart Example:AB  A+ B 2H 2 O  2 H 2 + O 2 *The reactant is more complex than the products.

4. 3. Combustion Reaction Anything that burns, Involves a hydrocarbon and oxygen, Produces Carbon Dioxide and water ***oxygen is always involved in a combustion reaction Example: CH 4 + O 2  CO 2 + H 2 O

5. 4. Single Displacement (sometimes called Single Replacement) One element of a compound is replaced “The stud and dud reaction” – The stud is more reactive than the dud. Example: A + BX  AX + B A is more reactive than B (so A replaces B) Mg +2HCl  MgCl 2 + H 2 B AX BX A

6. 5.Double Displacement Both compounds switch anions ** you will always form a gas or a precipitate Example: AX + BY  AY + BX KI + NaF  KF + NaI

7. 6. Acid-Base Reaction An acid and a base neutralize each other There is always an acid (H+) and a Base (OH-) in the reactants and it always produces water and a salt. Example: HCl + NaOH  H 2 0 + NaCl