2.1 History of Elements + Compounds

Question 1

What did Robert Boyle suggest in The Sceptical Chymist?

Answer 1

the term element should be applied only to matter which cannot be broken down into simpler substances.

Question 1

What belief of Aristotle’s endured for nearly 2000 years?

Answer 1

– the idea that any earthly form of matter could be manufactured by combining air, water, earth, and fire.
– offered ‘compound’ for matter formed by the combo of elements

Question 2

Who introduced the modern system of written chemical symbols?

Answer 2

– Jons Jakob Berzelius

Question 3

Define the Law of Conservation of Mass

Answer 3

in chemical changes, the total mass of all reactants = total mass of all products

Question 4

Define the Law of Definite Proportions

Answer 4

a specific compound always contains the same elements in the same definite proportions (chemical compound always contains the same proportion of elements by mass)

Question 5

What is an equivalent statement of the Law of Definite Proportions and state it

Answer 5

– Law of constant composition
– all samples of a given chemical compound have the same element composition

Question 6

Define the Law of Multiple Proportions

Answer 6

Some combos of elements can form more than one compound