Unit #4

Question 1

Democritus

Answer 1

o 460BC
o Discovered the atom
o Uncuttable
o Discovered that an atom is the smallest particle of an element that retains chemical identity of that element

Question 2

Who’s work did dalton use?

Answer 2

o Used lavoisiers work (law of conservation of matter)
o used prousts work (law of constant composition

Question 3

Daltons main points

Answer 3

o all matter consists of tiny particles called atoms
o all atoms are indestructible
o a chemical reaction only changes the way the atoms are grouped together
o elements are identified by their atoms. All atoms of a given element are identical, differ from any other element
o when elements react atoms combine is simple, whole number ratios

Question 4

Benjamin Franklin

Answer 4

o Studied static electricity
o discovered stationary electrical charge
o 2 types of electrical charge (+-)

Question 5

Thomson discovery

Answer 5

Found the first subatomic particle, electron

Question 6

Thomson studies

Answer 6

Studied currents of electricity in empty glass tubes

Question 7

Thomson experiment

Answer 7

Ran electricity through empty glass tubes, no gasses in the tubes
- tube +

Question 8

Thomsons model

Answer 8

Plum pudding
Some + charge holding together drifting - charges