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100
An atom, an ion, or a molecule, depending upon the way a substance commonly exists
Representative particle
100
The smallest whole number ratio of the atoms in a compound
Empirical formula
100
An equation in which each side has the same number of atoms of each element
Balanced equation
100
The temperature at which a solid changes into a liquid
Melting point
100
Tendency of molecules to move to regions of lower concentration
Diffusion
200
The number of representative particles of a substance present in 1 mole of that substance
Avogadro's number
200
A chemical equation that does not indicate relative amounts of reactants and products
Skeleton equation
200
Vaporization at the surface of a liquid that is not boiling
Evaporation
200
The change of a solid directly to a vapor
Sublimation
200
Any straight-chain or branched-chain alkane, alkene, or alkyne
Aliphatic hydrocarbon
300
The SI unit used to measure amount of substance
Mole
300
A new substance formed in a chemical reaction
Product
300
The conversion of a liquid to a gas below the boiling point
Vaporization
300
A measure of how much the volume of matter decreases under pressure
Compressibility
300
Any hydrocarbon compound in which a ring has bonding similar to benzene
Aromatic compound
400
0 C and 1 atm
Standard temperature and pressure
400
A starting substance in a chemical reaction
Reactant
400
the temperature at which the vapor pressure of a liquid is equal to the external pressure
Boiling point
400
The pressure exerted by a gas in a mixture
Partial pressure
400
Hard coal, having a carbon content of over 80%
Anthracite coal
500
The percent by mass of each element in a compound
Percent composition
500
A concise representation of a chemical reaction
Chemical equation
500
The temperature at which the vapor pressure of a liquid is equal to 1 atmosphere
Normal boiling point
500
The escape of gas through a small hole in a container
Effusion
500
Brown coal, having a carbon content of approximately 50%
Lignite
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