Short Hand for Chemical Reactions Chemical Equations Short Hand for Chemical Reactions 1

Chemical Equations The chemical formulas for molecules & element symbols are used to write a summary of the chemical reaction. The equation has two parts: The reactants - the molecules you start with. The products - The molecules that get made. EX: HCl + NaOH -> H2O + NaCl Reactants Products 2

Chemical Equations The reactants are listed on the left side of the arrow. EX: HCl + NaOH -> Reactants The products are listed on the right side (arrow points toward) EX: -> H2O + NaOH Products The arrow represents the reaction, the breaking of bonds & forming new ones. 3

Chemical Equations Sometimes the activation energy or the catalyst are listed in the equation. EX: 6CO2 + 6H2O Sunshine > C6H12O6 + 6O2 EX: 2H20 Platinum> 2H2 + O2 4

Chemical Equations A chemical equation is said to be balanced when it has the same number of atoms of each element on both sides. EX: Unbalanced CO2 + H2O Sunshine > C6H12O6 + O2 EX: Balanced 6CO2 + 6H2O Sunshine > C6H12O6 + 6O2 5

Chemical Equations Be prepared to: Identify the products and reactants. Specify if the equation is balanced. Identify the activation energy or catalyst if listed. 6

Chemical Equations Question: Identify the products in the reaction below: A. B. C. HCl + NaOH -> H2O + NaCl A B C 7

Short Hand for Chemical Reactions Chemical Equations Short Hand for Chemical Reactions 8