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chapter 2 vocabulary

words from chapter 2

pure substance matter that always has exactly the same composition
element a substance that can't be broken down into similar substances
atom the smallest particle of an element
compound a substance that's made from two or more similar substances and can be broken down into those similar substances
heterogeneous mixture a type of mixture in which the parts of the mixture are noticeably different from one another
homogeneous mixture a type of mixture in which the substances are so evenly distributed that it's 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 a mixture that contains some particles that are intermediate in size between small particles in a solution and larger particles in a suspension
physical property any characteristic of a material that can be observed/measured without changing the composition of the substances in the material
viscosity the tendency of a liquid to keep from flowing; resistance to flowing
conductivity a material's ability to allow heat or electric charges 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; the temperature at which vapor pressure is equal to atmospheric pressure
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
physical change a change that occurs when some properties of a material change, but the substances in the material stay the same
chemical property any property that produces a change in the composition of matter
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 change that occurs when a substance reacts and forms one or more new substances
precipitate a solid that forms and separates from a liquid mixture