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unit one A vocab

QuestionAnswer
what is chemistry? the study of the composition of substances and the changes they undergo
what is matter? anything that has mass and takes up space
what is an element? a pure substance made of only one kind of atom
what is a molecule? a neutral group of atoms held together by bonds
what is a compound? made from 2 or more atoms
what is a mixture? physical combination of 2 or more items
what is a physical change? a change in a substance that does not involve a change in the chemical makeup
what is a physical property? a characteristic that can be observed without changing a substances chemical make up
what is a chemical property? a substances tendency to undergo a transformation
what is a phase change? when a substance changes from a solid liquid or gas
what is a chemical change? a change in which one or more substances are converted into different substances
liquid particles slide past each other. indefinite shape and definite volume, high density
what is a solid particles in a fixed position, lowest KE, definite shape and volume, high density
gas particles move rapidly, highest KE, indefinite shape, lowest density
evaporation the surface process where a liquid changes into a gas vapor
condensation a phase change where a gas turns into a liquid
melting a phase change where a solid turns into a liquid
freezing a phase change where a liquid turns into a solid
sublimation a phase change where a solid turn directly into a gas
deposition a phase change where a gas turns directly into a solid without first becoming a liquid
flammability how easily a material can catch fire
viscosity the thickness of a liquid
distillation separating mixtures of pure substances by using their boiling points
filtration a method of separating mixtures containing insoluble solids and liquids by pouring them through a filter
chromatography mixture is separated by distributing its components between two phases
Created by: user-2042771
 

 



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