Chapter 0

Question 1

Law of Mass Conservation

Answer 1

No gain or loss of mass in chemical reactions; mass is conserved
Characterized by Antoine Lavoisier.

Question 2

Law of Definite Proportions

Answer 2

Elements are combined in the same proportion by mass. Whole number ratios.
Characterized by Joseph Proust

Question 3

John Daltons atomic theory

Answer 3

1.All matter consists of atoms.
2.Atoms are indestructible
3. Different elements have different atoms
4.All atoms of a given element are the same
5.Compounds are made by combining in whole number rations. Law of Definite Proportions.

Question 4

Electron

Answer 4

-Smallest
- (-) negative charge
- e-

Question 5

Proton

Answer 5

-middle in size
- (+) positive charge
- p

Question 6

Who characterized the electron?

Answer 6

J.J Thompson

Question 7

Who characterized the Proton?

Answer 7

E. Rutherford
-gold foil experiment

Question 8

Who characterized the neutron?

Answer 8

J. Chadwick and E. Rutherford

Question 9

Atomic # = Z. bottom of the symbol

Answer 9

number of protons

Question 10

Mass #. Top of symbol

Answer 10

protons + neutrons

Question 11

Isotopes

Answer 11

same atomic number, different mass number

Question 12

atomic mass

Answer 12

average mass of all isotopes in an element.

Question 13

Neutron

Answer 13

-largest
- no charge (0)
- n