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unit 1 lesson 1-6

QuestionAnswer
matter anything that has mass and takes up spare
mass a measure of the amount of matter in an object
weight a measure of the gravitational force exerted on an object
volume the amount of space that an object takes up or, occupied
density the ratio of the mass of of a substance to the volume of the substances
physical property a characteristic of a substance that does not involve a chemical change, such as density,color, or hardness
chemical property a property of matter that describes a substance ability to participate
physical change Physical changes are changes affecting the form of a chemical substance, but not its chemical composition
chemical change s any change that results in the formation of new chemical substances
law of conservation of mass the law
atom the basic unit of a chemical element
element each of more than one hundred substances that cannot be chemically inter converted or broken down into simpler substances and are primary constituents of matter. Each element is distinguished by its atomic the number of protons in the nuclei of its atoms.
compound a substance made up of atoms of two, or more different elements joined by chemical bonds
mixture made by mixing other substances together.
pure substance is composed of a particular set of molecules or ions.
heterogenou describes something that does not have a uniform structure of composition thoughout
homogenous Describes something that has a uniform structure of composition throughout
solid state of matter in which the volume and shape of a substance are fixed
liquid the state of matter that has a definite volume but not a definite shape
gas a form of matter that does not have a definite volume of shape
freezing the temperature at which a liquid turns into a solid when cooled.
melting make or become liquefied by heat.
evaporation the change of state from a liquid to a gas that usually occurs at the surface of liquid over a wide range of tempeture
boiling the temperature at which a liquid boils and turns to vapor.
condesation water that collects as droplets on a cold surface when humid air is in contact with it.
sublimation the change of state from a solid directly to a gas
deposition the change of state from a gas directly to a solid
Created by: 18cheern0930