The Atom: Development Flashcards
Who was the 1st person to propose the idea of atoms?
Democritus
Democritus
He was a Greek philosopher
Dalton’s atomic theory
John Dalton had the theory that atoms existed
The law of constant composition
It is the constant ratio of the composition of atoms in a molecule
The law of simple multiple proportions
Even if an element combines with another, the ratio of the mass of the element will be a whole number
Mixture
A substance that consists of multiple types of elements or compounds that aren’t chemically bonded together
2 types of mixtures
Homogenous and heterogeneous mixtures
Homogenous mixture
A mixture that is consistent throughout the mixture; the same
Heterogeneous mixture
A mixture that isn’t consistent throughout the mixture; different
4 types of mixtures
Solution, suspension, colloid and emulsion
Solution
A homogenous mixture that consists of 2 substances; the solvent and the solute. Usually a liquid
Solvent
The liquid in a solution
Solute
The dissolved substance
Suspension
A heterogeneous mixture with insoluble solid participles settled at the bottom
Colloid
A heterogeneous fluid with insoluble solid participles suspended
Emulsion
A colloid formed with the combining of multiple different liquids
Scientific theory
An idea supported by predictions and evidence
Thomson plum pudding atomic model
Joseph John Thomson had model of the atom which consisted of a positive-charged matrix and negative-charged participles
