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Physical science

chapter 2

vocabulary wordmeaning
pure substance matter that always has exactly the same composition
pure substance matter that always has exactly the same composition
element a substance that cannot be broken down into simpler substances
atom the smallest particle of an element
compound a substance that is made from two or more simpler substances and can be broken down into those simpler substances
heterogeneous mixture the parts of the mixture are noticeably different from one another
homogeneous mixture the substances are so evenly distributed that it is difficult to distinguish one substance in the mixture from another
solution a mixture that forms when substances dissolve and form a homogeneous mixture
suspension a heterogeneous mixture that separates into layers over time
colloid contains some particles that are intermediate in size between the small particles in a solution and the larger particles in a suspension
physical property any characteristic of a material that can be observed or measured without changing the composition of the substances in the material
viscosity the tendency of a liquid to keep from flowing, it's resistance to flowing
conductivity a materials ability to allow heat to flow
malleability the ability of a solid to be hammered without shattering
melting point the temperature at which a substance changes from a solid to a liquid
boiling point the temperature at which a substance boils
filtration a process that separates materials based on the size of their particles
distillation a process that separates the substances in a solution based on their boiling points
flammability a material's ability to burn in the presence of oxygen
reactivity the property that describes how readily a substance combines chemically with other substances
chemical change it occurs when a substance reacts and forms one or more new subtances
precipitate any solid that forms and separates from a liquid mixture
Created by: sritchie
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