Atomic Theory

Question 1

Democritus

Answer 1

says the world is made up of tiny invisible particles called “atomos”

Question 2

Lavoisier

Answer 2

Law of Conservation of Mass and Matter

Question 3

Law of Conservation of Mass and Matter

Answer 3

the total mass of the of the products of a chemical reaction is the same as the total mass of the reactants

Question 4

Joseph Proust

Answer 4

Law of Definite Proportions

Question 5

Law of Definite Proportions

Answer 5

the elemental composition of a pure substance is always the same

Question 6

John Dalton

Answer 6

Atomic Theory

Question 7

Atomic Theory

Answer 7

1) each element is composed of extremely small particles called atoms
2) all atoms of a given element are identical, but differ from those of any other element
3) atoms are neither created nor destroyed in any chemical reaction
4) a given compound always has the same relative numbers and kinds of atoms
5) atoms cannot be subdivided, created nor destroyed

Question 8

Ben Franklin

Answer 8

discovered electricity ( kite and key experiment)

Question 9

Micahael Faraday

Answer 9

atoms contain particles that carry an electrical charge

Question 10

Joseph J. Thomson

Answer 10

cathode ray tube experiment; discovered the electron which is a negative particle; finds a charge to mass ratio 1.76 x 10^8 C/g; plum pudding model

Question 11

Robert Millikan

Answer 11

oil drop experiment; 1.6 x 10^-19 C = 1.76 x 10^8 C/g; mass of an electron = 9.11 x 10^-28 g

Question 12

Ernest Rutherford

Answer 12

gold foil experiment; discovers a positive charged particle in the atom; discovered that atoms are mostly empty space; nuclear model

Question 13

Henry Mosely

Answer 13

comes up with idea that there is an unique positive charge in the nucleus of different elements
- atoms could now be identifies by the
number of protons they contain
(atomic number)

Question 14

James Chadwick

Answer 14

discovers the neutron

Question 15

proton mass (g)

Answer 15

1.673 x 10^-24 g

Question 16

proton charge (C)

Answer 16

+ 1.602 x 10^-19

Question 17

proton mass (amu)

Answer 17

1

Question 18

neutron mass (g)

Answer 18

1.675 x 10^-24

Question 19

neutron charge (C)

Answer 19

0

Question 20

neutron mass (amu)

Answer 20

1

Question 21

electron mass (g)

Answer 21

9.109 x 10^28

Question 22

electron charge (C)

Answer 22

-1.602 x 10^19

Question 23

electron mass (amu)

Answer 23

0

Question 24

isotope

Answer 24

atoms of elements that have the same number of protons but different number of neutrons (will have different masses)