1. Types of Chemical Reactions

2. Chemical Reactions grouped into categories based on reactions following the same pattern

3. Synthesis two simple reactants combine to make a larger or more complex product the general pattern is: A + B  AB the reactants can be either atoms (elements) or molecules (elements or compounds)

4. Examples Synthesis reactionEquation zinc sulfidezinc + sulfur  zinc sulfide Zn(s) + S(s)  ZnS (s) sodium chloridesodium + chlorine  sodium chloride Na(s) + Cl 2 (g)  NaCl (s) ammonium chlorideammonia + hydrogen chloride  ammonium chloride NH 3 (g) + HCl (g)  NH 4 Cl (s) GENERAL PATTERNA + B  AB produces zinc sulfide powder produces sodium chloride produces cloudy white ammonium chloride powder

5. Decomposition large compounds broken down into smaller compounds or elements the general pattern is: AB  A + B often absorb energy from external source and converts products into reactants

6. decomposition happens when the stability of a chemical compound is limited by exposure to an adverse condition examples include heat, radiation, humidity or the acidity of a solvent

7. Examples Decomposition ReactionEquation waterenergy + water  hydrogen + oxygen H 2 O(l)  H 2 (g) + O 2 (g) sodium azideenergy + sodium azide  sodium + nitrogen NaN 3  Na (s) + N 2 (g) GENERAL PATTERNAB  A + B http://www.youtube.com/watch?v=dZfLOnXoVOQ

8. Homework: p. 239 #1,2,4