Chem Midterm1

Front 1

democritus

Back 1

atom=smallest possible particle of matter

Front 2

daltons atomic theory

Back 2

1/elements made of indivisable
particles called atoms.
2/atoms same element=identical
atoms diff.element=differnt
3/atoms combine chemically in small whole #ratios form comp.
4/chemical reactions,atoms joined,sep,rearragned,but atoms never change atoms of diff.element

Front 3

thomson

Back 3

exp.w/flow of electricity, sealed gases in glass tubes w/
metal disk &electrodes.<-conn.
high voltage elec.
1=pos charged 1=neg charged

Front 4

rutherford

Back 4

plum pudding model, ex.thin gold sheet
-most of atom=empty space
-very dense, very small

Front 5

electonegativity bonds

Back 5

0.0-0.4=nonpolar
0.5-2.0=polar covalent
2.1 ^ =ionic bond

Front 6

if a molecule contains polar bonds and is symetrical...

Back 6

it is a nonpolar molecule

Front 7

if molecules contain polar bonds and Not symetrical...

Back 7

molecule=polar