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unit 1 lesson 1

unit1 lesson 1

TermDefinition
matter anything that has mass and takes up space
mass describes the amount of matter in an object
weight a measure of the gravitational force on an object
volume the amount of space that an object takes up or occupies the objects volume
density a measure of the amount of mass in a given volume
physical property a characteristic of a substance that can be observed and measured without changing the idenity of the substance
chemical property describes a substances ability to change into a new substance with diffrent properties
physical change a changed that affects one or more physical properties of a substance
chemical change occurs when one or more substances change into entirely new substances with different properties
law of conservation of mass states that in ordinary chemical and physical changes mass is not created or destroyed but is only transformed into different substances
atom are the smallest unit of an element that maintains the properties of that element
element made up of one or more of the same kind of atom chemically combined
compound made up of different kinds of atoms chemically combined
mixture contains a variety of elements and compounds that are not chemically combined with each other
pure substance substance that has definite physical and chemical properties such as appearance, melting point, and reactivity
heterogeneous mixture is one that does not have a uniform composition
homogeneous each part of the sugar water mixture has the same sweet taste
solid substance has a definite volume and shape
liquid substance has a definite volume but not a definite shape
gas does not have a definite volume or shape
freezing the change in state in which a liquid becomes a solid
melting particles are able to slide pass each other the change of state from a solid to a liquid
evaporation as liquid is warmed its particles gain energy some particles gain enough energy that they escape from the surface of the liquid and becomes gas
boiling a rapid change from a liquid to a gas or a vapor
condensation as a gas is cooled its particles lose energy the attraction between particles overcomes the speed of their motion and liquid froms
sublimation the change from a solid state directly into a gas
deposition is the change in state from a gas directly to a solid
Created by: 18byoung0901
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