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Chapter 3 - Chem

What is the smallest unit of matter? the atom
What is a substance that cannot be broken down by ordinary chemical means? element
Who coined the term the atom? Democritus
What law says, "Mass is neither created nor destroyed during ordinary chemical reactions or physical changes"? Law of Conservation of Mass
The transformation of a substance or substances into one or more new substances is known as chemical reaction
A chemical compound contains the same elements in exactly the same proportions by mass regardless of the size of the sample or source of the compound according to what law? Law of Definite Proportions
It two or more different compounds are composed of the same two elements then the ratio of the masses of the second element combined with a certain mass of the first element is always a ration of small whole numbers is stated by what law? Law of Multiple Proportions
Who developed the atomic theory Dalton
Are atoms divisible into smaller particles? yes
All matter is composed of what? atoms
What identifies an element the proton
What are the two main parts of an atom? nucleus and the electron cloud
What are the subatomic properties of an atom? proton, neutron, electron
What charge does a proton have? positive
What charge does a neutron have? neutral
What charge does an electron have? negative
What subatomic particle(s) are found in the nucleus? proton and neutron
What subatomic particle(s) are found in the electron cloud? electrons
What scientist measured the charge-to-mass ration of an electron? J.J. Thomson
Who did the oil drop experiment? Robert Milikan
Created by: BeantownBio