Vocab Quiz - Unit 3 Flashcards
natures basic particle
atom
the translation o/ a substance or substances into one or more new substances is known as a
chemical reaction
mass is neither created nor destroyed during ordinary chemical reactions or physical reaction
law of conservation of mass
the fact that 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 is known as the
law of definite proportions
if 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 ratio of small whole numbers
law of multiple proportions
as the smallest particle of an element that retains the chemical properties of that element
atom
very small region located at the center of an atom
nucleus
usually one or more neutral particles called
neutrons
negatively charged particles
electrons
protons neutrons and electrons
subatomic particles
glass tubes
cathode ray tubes
short ranged proton neutron proton proton and neutron neutron forces hold the nuclear particles together and are refered to
as nuclear forces
number of protons of each atom of that element
atomic #
atoms of the same element that have different masses
isotroopes
total number of protons and neutrons that make up the nucleus of an isotope
mass #
general terms for a specific isotope of an element
nucleide
1 amu 1/12 mass of carbon 12 atom
atomic mass unit
weighed average of the atomic masses of the naturally occurring isotopes of an element
average atomic mass
of particles in exactly one mole of a pure substance 6.022 x 10 ^23
avogadro’s number
mass of one mole of a pure substance
molar mass
