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Vocab exam chem

Chemistry Vocab for End of the Year Exam

Mass A measure of the amount of matter that an object contains
Space -----
Matter Anything that has mass and occupied space
Volume a measure of space occupied by a same of matter
Law of consercation of mass in any physical change or chemical reaction mass is conserved mass can be neither created or destroyed
Chemistry the study of the composition of matter and the changes that matter undergoes
Chemical Change a change that produced matter with a different composition than the original matter
Physical Change a change during which some properties of a material change but the composition of the material does not
Chemial Property the ability of a substance to undergo a specific chemical change
Physical Property a quality or condition of a substance that can be observed or measures with out changing the substances composiotion
Element the simplest form of matter that has a unique set of properties
Compound a substance that contain 2 or more elements chemically combined in a fixed proportion
Ion an atom or group of atoms that has a positive or negative charge
Ionic Compound a compound composed of negative and positie ions
Density the ration of the mass of an object to its volume
Theory a well tested explanation for a broad set of observations
Law of definite proportions in samples of any chemical compound the masses of the element are always in the same porption
mixture a physical blend of two or or substances that are not chemically combined
accuracy the closeness of a measurement to the true value of what is being measured
precision describes the closeness or reproducible of a set os measurements takes under the same conditions
chemical formula an expression that indicates the number and type of atoms present on the smallest repestitve unit of a substance.
Mole the amount of a substancethat contains 6.02x10^23 representitive particles of that substance
Molar mass a tem used to refer to the mass of a mole of any substance
cation any atom or group of atoms with a positive charge
anion any atom or group of atoms with a negitive charge
`polyatomic ion A tightley bound group of atoms that behaves a s a unit andd has a positive o negitive charge
stoichiometry tha tportion of chemistry dealing with numrical relationships on chemical reactions
atomic mass unit a unit of mass equal to 1/12 the mass of a carbon-12 atom
STP the conditions under chich the volume of a gas is usually measured
Standard molar volume the volume occupied by one mole of a gas at STP
limitiong ractant any reacant that issued up first in a chemical reaction
excess reactant a reactant present in a quality that is more than suffient to react with a limition reagant
theoretical yeild the amount of product that could form dueing a reaction calcated form a balance chemical equatoions
kenetc molecular heory a theory ecplaning the states of matter based on the concepts that all matter consists of tiny particles that are in constant motion
boyle's law for a gives mass of a gat at constant temo the volume of the gassvaries inversly with pressure
charles law the volume of a fixed mass of a gas is directly proportionla to its kelcin temp ig the pressure is kept constand
the pressure of a gass is diresctly proportional to the kelvin temp if the volume is constandt
Created by: ShelbyB



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