2 WHAT HAPPENS TO ATOMIC RADII? Does a negative ion (anion) get larger or smaller?Does a positive ion (cation) get larger or smaller?
3 WHAT IS IONIZATION ENERGY? The energy required to remove an electronWhich element has the highest ionization energy? Why?
4 WHAT IS ELECTRONEGATIVITY? The ability of an atom to pull off an electron.Which element has the highest electronegativity? Why?
5 WHAT HAPPENS TO REACTIVITY? What happens to reactivity in the Alkali Metals?What happens to reactivity in the Halogens?
6 How do we balance equations? Law of Conservation of Mass: No matter can be created or destroyed.Begin by counting all the atoms on each side of the yield sign (→)Now it’s trial and error but there are some guidelines that help you get started:Begin by balancing the elements that are combined and that appear only once on each side of the equation.Balance polyatomic ions as single unitsBalance H atoms and O atoms after all other elements have been balancedTry not to change large compounds
7 LET’S BALANCE THIS EQUATION! CO2 + H2O → C6H12O6 + O2How many atoms on each side?Which element do you begin with?Remember you cannot change subscript, only add coefficients!6CO H2O → C6H12O6 + 6O2
8 How Will Chemicals React? H2 + O2 → H2OREACTANTS → PRODUCTSEXOTHERMIC REACTIONS: Heat is a product (feels hot!)ENDOTHERMIC REACTION: Heat is a reactant (feels cold!)