Chapter 2

Question 1

Early Atomic theory

Answer 1

Democritus believed the world was made up of tiny particles (atoms) which cannot be subdivided

Question 2

Law of conservation of mass

Answer 2

Mass cannot be created or destroyed

Question 3

Law or definite proportions

Answer 3

Chem. Cmpd. Contains same elements in same proportions regardless of size and source of cmpd.

Question 4

Law of multiple proportions

Answer 4

2 elements reactions to form more than 1 cmpd., flexed mass of 1 element react w/ masses of other element in a ratio of small whole #s

Question 5

Study daltons theory briefly-

Question 6

Thompson’s cathode ray proved ___

Answer 6

E- are - charged and very small

Question 7

Rutherford’s gold foil experiment discovered the __ and proved it was ____

Answer 7

Nucleus; small, dense, and + charged

Question 8

James Chadwick discovered ___

Answer 8

neutron

Question 9

Atomic mass

Answer 9

Avg. mass of atoms of an element

Question 10

The mole is a ____

Answer 10

COUNTING UNIT

Question 11

Moles are useful bc we can now______

Answer 11

Weigh elements and how many atoms it’s made of