Unit 2

Question 0

Aristotle

Answer 0

Elements

Question 1

Democritus & Leucippus

Answer 1

Atomos

Question 2

Robert Boyle

Answer 2

Experimental definition of element

Question 3

Lavoisier

Answer 3

Father of modern chemistry

Question 4

Dalton’s atomic theory

Answer 4

1) elements are made up of atoms
2) atoms of each element are identical
3) compounds are formed when atoms combine in a specific number and kinds of atoms
4) atoms are not created nor destroyed

Question 5

Gay-Lussac

Answer 5

Compounds always react in whole number ratios by volume in the same temperature and pressure conditions

Question 6

Avagadros Hypothesis

Answer 6

At the same temperature and pressure equal volumes of gas contain the same number of particles

Question 7

J. J. Thomson

Answer 7

Found electron, atom was like plum pudding

Question 8

Bequerel

Answer 8

Discovered three types of radioactivity rays

Question 9

Rutherford

Answer 9

Discovered:
Atom is mostly empty
Small sense positive center that deflects alpha particles

Question 10

Cation

Answer 10

Positive ion

Question 11

Anion

Answer 11

Negative ion

Question 12

Least massive particle in an atom

Answer 12

Electron

Question 13

Particle possessing no charge

Answer 13

Neutron

Question 14

Alpha particle

Answer 14

Two protons and two neutrons (similar to helium)

Question 15

Molecule composed of two atoms

Answer 15

Diatomic molecule

Question 16

Streams of electrons that are produced when a high voltage is applied to electrodes in an evacuated tube

Answer 16

Cathode rays

Question 17

Emits gamma rays

Answer 17

Radioactivity

Question 18

Alpha

Answer 18

Helium nucleus

Question 19

Beta

Answer 19

High speed electron

Question 20

Gamma

Answer 20

High energy light

Question 21

Positron

Answer 21

Positively charged electron