# chemistry chapter 3-4

## 24 terms

### Law of conservation of mass

in every chemical process, and equal amount of matter exists before and after the experiment

### Law of definite proportions

in a chemical compound, the proportions by mass of its elements is always the same regardless of the compounds source

### Law of multiple proportions

When two elements form compounds, the masses of one element that combine with a given amount of another are in small whole # ratios

### Daltons atomic theory

1. matter=atoms, atoms=indivisible
2. atoms of different elements are identical
3. different elements have different atoms
4. elements make compounds
5. atoms are indestructible and keep their identities

### j.j thomson

-cathode ray tubes
-electric field went from negative to positive
-concluded that all atoms have negative particles

### Robert Milleken

-sprayed oil into a box
-discovered that the mass of and electron and the charge of the droplet is always a multiple of a specific number

### Ernest rutherford

-gold foil with film detector
-suggested that the mass of an atom is in the nucleus and the volume was the electrons

### atomic number

(Z)
#of protons (electrons)

### mass number

(A)
# of protons+neutrons (NOT ON PT)

### isotopes

atoms of the same element that have different numbers of neutrons

### relative atomic mass

1 amu=1/12 mass of C-12

### Mole

# of atoms in 1 atom of C-12
6.02X 10^23

### Mass of the PT

-average mass of 1 ATOM IN AMU
-average mass of 1 MOLE IN GRAMS

### MASS-MOLE-ATOM

MASS divided by # on pt=MOLE

### emr

electric field and magnetic field are in perpendicular waves

### lambda

wavelength: the distance between on peak to the next peak [m,nm,mm]

### nu

frequency: ammount of wave that passes in a given time [/s, hz]

100x10^6/s

high ν
high E

### inverse relationship

c=νλ
c=speed of light (3.00x10^8m/s)

### direct relationship

between energy and frequency

### E=?

E=h*v
j=js*/s
h=6.626x10^-34 Js

### on spectrum

VIBGYOR
(blue has more energy than red!)

### quantum

A small, discrete packet of light energy