Unit 2 Flashcards
(15 cards)
Who discovered the element of Air?
Anaximenes
Who discovered the element of fire?
Heraclitus
Who discovered the element of water?
Thales
What was the order of suggested elements?
Water Air Fire Earth Ether
Who suggested the combination of the first 4 elements?
Empedocles
What is the modern translation of the four elements?
Gas = Air Liquid = Water Solid = Earth Energy = Fire
Who suggested the fifth element? What was it?
Aristotle = Ether
What was Aristotle’s idea?
That any earthly matter could be formed by a receipe of the four terrestrial elements.
Who made progress towards classifying matter?
Robert Boyle
What were Robert Boyles Suggestions?
1) the term element should be applied only to matter that was unable to be further broken down
2) a compound is a term for matter which was combined elements
What was Jon Jakob Berzelius’ contribution?
introduced our modern system of writing chemical symbols
How many laws of chemistry? What are they?
Law of Conservation of Mass
Law of Definite Proportions
Law of multiple proportions
What is this:
“In a chemical reaction, the total mass of all reactants will equal the total mass of all products”
Law of conservation of mass. Whatever gets put in (reactants) must come out (products)
(THIS ONLY APPLIES TO CLOSED SYSTEMS - Gas CAN escape)
What is this:
“A specific compound always contains the same elements in the same definite proportions”
Law of Definite Proportions
ie. Water is always H20
What is this:
“Some combinations of elements may be capable of forming more than one compound”
Law of multiple proportions
