# this is a byotch Flashcard

 empirical formula
 expresses the smallest whole number ratio of atoms present
 molecular formula
 gives the actual numbers of each element present in the compound
 molecular weight
 the mass of one mole of the compound
 formula weight
 same as molecular weight, but ionic compounds dont exist as molecules
 molar mass
 another term for one mole of a compound, whatever it may be. F U mr adams…
 how to calculate the empirical formula
 1-get mass of each element in grams2-divide by AM to get # of moles 3-dived the number of moles of each element by the smallest number of moles, if theyre all integers, they are the subs.4-make them whole numbers if theyre not
 how to calculate the molecular formula
 1-multiply subs by molecular mass2-divide molar mass by empirical mass3-round up, and then multiply by subs again
 soluble things
 -nitrate(NO3), chlorate(ClO3), and acetates(C2H3O2)-Na,K,and NH4 salts -Cl, bromide and iodide salts without Ag.Pb,Hg
 not soluble stuff
 hydroxide(OH)and Sulfide(S) salts unless theyre with Na,K,or NH3 and moderately soluble with Ca,Ba,and Srcarbonates(CO3),phosphates(PO4) salts unless with Na,K,or NH3
 synthesis reaction
 A+X->AX A and X can be elements or compounds
 single replacement reaction
 A+BX->AX+B or Y+BX->BY+X where A,B,X and Y are elements and AX, BX, and BY are compounds
 double displacement reaction
 AX+BY->AY+BX where A,B,X, and Y in the reactants are ions and AY and BX are ionic or molecular compounds
 decomposition reaction
 AX->A+X where AX is a compound, A and X can be elements or compounds
 density equation
 D=m/v
 elements
 cannont be broken down by any chemical means into another substance
 compound
 when two or more different elements unite to form a new substance
 oxyanion series
 ClO – hypochlriteClO2 – chloiriteClO3 – chlorateClO4 – perchlorate(all have a -1 charge)
 balance: Na2O + H2O
 Na2O + H2O -> 2NaOH
 mole
 6.022 x 10^23
 scientific notation
 expresses a number as a product of a number between 1 and 10 and the appropriate power of 10
 sig fig rules
 integers are always sig…leading integers are never sig…captive zeroes are sig…trailing zeroes are sig if there is a decimal poin in the number…exact numbers and physical constants are treated as if infinitely sig.
 dalton
 atomic theory
 william thompson
 plum pudding model
 rutherford
 gold foil experiment
 mimitri mendeleev
 first periodic table