December 2016 Objective: Journal: To understand what elements combine to form what compounds Describe how chemical reactions work Journal: Have you ever done a chemical reaction? Describe what you did.

Chemical Reactions

Chemical Makeup of Compounds Written as atomic symbols with subscripts Atomic symbols tell what elements are in the compound Subscripts tell how many of each element are in the compound Examples: H2O C6H12O6

Chemical Reaction The process of rearranging the bonds within two or more substances in order to form at least one new substance

Reactants A substance that is present at the beginning of a chemical reaction

Products A substance that is formed during a chemical reaction

Which side are reactants and which side are products? 6CO2 +6H20  C6H12O6 + 6O2

6CO2 +6H20  C6H12O6 + 6O2 The number before the compound tells you how many of each compound are on each side of the reaction Must have an equal number of each element on both sides of the reaction because matter cannot be created or destroyed

Chemical Reactions will only occur under certain conditions… It must have enough energy. The atoms must be aligned properly.