Chemistry

 

 

Law of Definite Composition

 

Every sample of a compound has the same proportion of constituent elements

 

 

Law of Multiple Proportions

Atoms of two or more elements may combine in different ratios to produce more than one compound.

 

 

Formula Mass

Sum of Atomic masses in a compound

(don’t forget – pay attention to subscripts)

;

;

Molecular Compounds

form between 2 or more nonmetals

ex: CCl2, CO, CO2

;

;

Molecular Elements aka

Diatomic molecules;

H2,N2,F2,O2,I2,Cl2,Br2;

Hydrogen, Nitrogen, Fluorine, Oxygen, Iodine, Chlorine, Bromine

;

;

Ionic Compounds

Form between a metal and one or more non-metals

NaCl, FeCl2, Fe2O3

(metal gives an electron to a non-metal)

;

;

Covalent Bond

Forms between two or more non-metals

(molecular)

Origin –

Organic vs. Inorganic

Origin – determine number of comounds and potential elements involved

Organic – CH, CHO, CHON elements – millions of compounds

vs.

Inorganic – carbon must be from non-living source plus all other elements

10-13k

;

;

Binary Compounds

form between two elements

covalent or ionic

;

;

Tertiary Compounds

Three elements; ionic is usually a metal ; polyatomic and covalent is usually an organic CHO

;

;

Quaternary Compounds

Four elements – if ionic its usually a polyatomic cation and an anion.; If covalent its a CHON (protein) ex: (NH4)SO4

;

;

Order for non-metals in a chemical formula

C,P,N,H,S,I,Br,Cl,O,F
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