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Chemistry Chapter 3


Law of Conservation of Mass mass is matter created nor destroyed during ordinary chemical reaction or physical change
Law of Definite Proportions Fact that chemical compound contains the same elements is exactly the same proportions by mass regardless of the size of sample of compound
Law of multiple proportions 2 or more different compounds composed of same 2 elements
Atom smallest particle of an element that retains the chemical properties of the element 2 regions that make up an atom
Nuclear forces short range proton-neutron, proton-proton, and neutron-neutron forces hold the nuclear particles together
Atomic number (z) element is number of protons of each atom of an element
Isotope atoms of same element that have different masses
Simplest atoms Hydrogen
Mass number (a) total number of protons+neutrons that make up nucleus of isotope
Nuclide is general term for specific isotope of an element
Atomic Mass Unit exact mass of carbon-12 atom
Average Atomic Mass Average of atom masses of naturally occurring isotopes of an element
Mole amount of substance that contains as many particles as there are atoms in exactly 12g of carbon-12
Avogadro's Number 6.022 x 10²³
Molar Mass mass of 1 mole of a pure substance
Model of atomic theory 1. All matter is small particles called atoms 2. Atoms of given element are identical in size, mass and properties. Atoms of different elements differ in size, mass, and properties 3. Atoms cannot be divided, created, or destroyed 4. Atoms of different
Democritus he called basic particle an atom
Aristotle thought atoms were made from the elements of the earth (wind,fire,water,earth)
Dalton proposed explanation for law of conservation, law of definite proportions. Said elements composed if atoms and only whole numbers of atoms can form compounds
Thomson proposed plum pudding model - believed negative electrons were spread evenly thru out positive charge of atom
Rutherford discovered volume of nucleus was very small
Bohr Rutherfords student who proposed model which electrons surrounded the + charge nucleus
Shrodinger modern atom
Difference between continuous and discrete continuous- continuous discrete-goes on in and desecrate is a finite number
Created by: Trick