Unit 8

Question 1

Who rejected Democritus’ idea of of the atoms?

Answer 1

Aristotle

Question 2

Four properties which could exist (medieval chemistry) were….

Answer 2

Moist, dry, heat and cold

Question 3

Four major elements (medieval chemistry)

Answer 3

Water, air, fire and earth

Question 4

Greek theories back in the day were heavily based on….

Answer 4

Philosophical and moralistic natures. Did little or nothing to suggest a direction for experimental work, they thought it was misleading. Chemists were called alchemists.

Question 5

Why did they want to separate metals from ores?

Answer 5

Metals were useful and valuable in many aspects of life

Question 6

Back then matter existed as….

Answer 6

“Corpuscles”

Question 7

Dalton’s Atomic Theory

Answer 7

John Dalton

• elements are made up of extremely small particles called atoms
• the atoms making up a particular elements are identical and different types of atoms have different properties
• each chemical compound is unique with a specific combination of atoms
• chemical reactions involve the reshuffling of the atoms to make new compounds

Question 8

Dalton’s Atomic Theory explained three fundamental laws which are….

Answer 8

• The Law of Definite Proportions
• The Law of Multiple Proportions
• The Law of Conservation of Mass

Question 9

The Thomson Model of the Atom

Answer 9

Discovered electrons (corpuscles), “plum pudding model” of a ball of a positive charge with electrons embedded in it

Question 10

Earliest suggestion of the existence of atoms made by….

Answer 10

Democritus