2WHAT HAPPENS TO ATOMIC RADII? Does a negative ion (anion) get larger or smaller?Does a positive ion (cation) get larger or smaller?
3WHAT IS IONIZATION ENERGY? The energy required to remove an electronWhich element has the highest ionization energy? Why?
4WHAT IS ELECTRONEGATIVITY? The ability of an atom to pull off an electron.Which element has the highest electronegativity? Why?
5WHAT HAPPENS TO REACTIVITY? What happens to reactivity in the Alkali Metals?What happens to reactivity in the Halogens?
6How 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
7LET’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
8How Will Chemicals React? H2 + O2 → H2OREACTANTS → PRODUCTSEXOTHERMIC REACTIONS: Heat is a product (feels hot!)ENDOTHERMIC REACTION: Heat is a reactant (feels cold!)