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Vocab exam chem
Chemistry Vocab for End of the Year Exam
Term | Definition |
---|---|
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 |