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Physical Sci-Ch 2
vocabulary words
Question | Answer |
---|---|
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 |