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Chapter 2 Vocab

Pure substance matter that always has exactly the same composition
element a substance that cannot be broken down into simpler substances
atom smallest particle of an element
compound a substance that is made of 2 or more substances that can be broken down into simpler substances
heterogeneous mixture the parts of a mixture are noticeably different from one another
homogeneous mixture the substances are so evenly distributed that it is difficult to distinguish between one another
solution when a substance dissolves and turns into a homogeneous mixture
suspension a heterogeneous mixture that separates into layers over time
colliod 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 that can be observed or measured without changing the substance in the material
viscosity the tendency of a liquid to keep from flowing
conductivity a materials ability to allow heat to flow through it
malleability the ability of a solid to be hammered without shattering
melting point the temperature in which a substance changes from a solid to a liquid
boiling point the temperature in which a substance boils
filtration a process the separates materials based on the size of their particles
distillation a process that separates the substance in a solution based on their boiling points
physical change occurs when some properties are changed in a material, but the substances stay the same
chemical property any ability to produce a change in the composition of matter
flammability a materials ability to burn in the presence of oxygen
reactivity the property that describes how readily a substance combines chemically with other substances.
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