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Physical Sci-Ch 2

vocabulary words

pure substance matter that always has exactly the same composition
element substance that can't be broken down into simpler substances
atom smallest particle of an element
compound substance made from two or more simpler substances
heterogeneous mixture parts of the mixture are noticeably different from one another
homogeneous mixture substances are so evenly distributed that it is difficult to distinguish one substance from another
solution when substances dissolve and form a homogenous mixture; tap water, windshield wiper solution
suspension heterogenoeus mixture that separates into layers over time; salad dressing
colloid contains some particles that are intermediate in size between the small particles in a solution and the larger particles in a suspension; don't separate into layers; milk is an example
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 material's ability to allow heat to flow
malleability ability of a solid to be hammered without shattering
melting point temperature at which a substance changes from a solid to a liquid
boiling point temperature at which a substance boils
filtration process that separates materials based on the size of their particles
distillation process that separates the substances in a solution based on their boiling points
physical change occurs when some of the properties of a material change, but the substance in the material remains the same
chemical property ability to produce a change in the composition of matter
flammability material's ability to burn in the presence of oxygen
chemical change occurs when a substance reacts and forms one or more new substances
precipitate any solid that forms and separates from a liquid mixture
reactivity property that describes how readily a substance combines chemically with other substances
Created by: msparks