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this is a byotch
chem terms that we should know....ew
25
Chemistry
10th Grade
01/10/2007

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Term
empirical formula
Definition
expresses the smallest whole number ratio of atoms present
Term
molecular formula
Definition
gives the actual numbers of each element present in the compound
Term
molecular weight
Definition
the mass of one mole of the compound
Term
formula weight
Definition
same as molecular weight, but ionic compounds dont exist as molecules
Term
molar mass
Definition
another term for one mole of a compound, whatever it may be. F U mr adams...
Term
how to calculate the empirical formula
Definition
1-get mass of each element in grams
2-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
Term
how to calculate the molecular formula
Definition
1-multiply subs by molecular mass
2-divide molar mass by empirical mass
3-round up, and then multiply by subs again
Term
soluble things
Definition
-nitrate(NO3), chlorate(ClO3), and acetates(C2H3O2)
-Na,K,and NH4 salts
-Cl, bromide and iodide salts without Ag.Pb,Hg
Term
not soluble stuff
Definition
hydroxide(OH)and Sulfide(S) salts unless theyre with Na,K,or NH3 and moderately soluble with Ca,Ba,and Sr
carbonates(CO3),phosphates(PO4) salts unless with Na,K,or NH3
Term
synthesis reaction
Definition
A+X->AX

A and X can be elements or compounds
Term
single replacement reaction
Definition
A+BX->AX+B or Y+BX->BY+X where A,B,X and Y are elements and AX, BX, and BY are compounds
Term
double displacement reaction
Definition
AX+BY->AY+BX where A,B,X, and Y in the reactants are ions and AY and BX are ionic or molecular compounds
Term
decomposition reaction
Definition
AX->A+X where AX is a compound, A and X can be elements or compounds
Term
density equation
Definition
D=m/v
Term
elements
Definition
cannont be broken down by any chemical means into another substance
Term
compound
Definition
when two or more different elements unite to form a new substance
Term
oxyanion series
Definition
ClO - hypochlrite
ClO2 - chloirite
ClO3 - chlorate
ClO4 - perchlorate
(all have a -1 charge)
Term
balance: Na2O + H2O
Definition
Na2O + H2O -> 2NaOH
Term
mole
Definition
6.022 x 10^23
Term
scientific notation
Definition
expresses a number as a product of a number between 1 and 10 and the appropriate power of 10
Term
sig fig rules
Definition
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.
Term
dalton
Definition
atomic theory
Term
william thompson
Definition
plum pudding model
Term
rutherford
Definition
gold foil experiment
Term
mimitri mendeleev
Definition
first periodic table
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