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Matter and Energy

Introduction to matter

matter anything that has mass and takes up space
mass describes the amount of matter in an aobject
weight is a measure of the gravitational force of an object
volume the amount of space that an object that takes up, or occupies
density a measure of the amount of mass given volume
physical property a character of a substance that can be observed and measured without changing the identity of the sunstance
chemical property describes a substances ability to change into a new substance with different properties
physical change is the change that affects one or more physical properties of a substance
chemical change 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
pure substance A sample of matter either a single element or single compound that has definite chemical and physical properties
element made up of one or more of the same kind of atom chemically combined
heterogeneous mixture is one that does not have a uniform composition
compound made up of different kinds of atoms chemically combined
homogeneous each part of the sugar-water mixture has the same sweet taste
mixture contains a variety of elements and compounds that are not chemically combined with each other
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 or shape
freezing the change in state in which a liquid becomes a solid
condensation this change of state from gas to liquid
melting change of statefrom a solid to a liquid
sublimation the change from a solid state directly into a gas
evaporation the change of state from a liquid to a gas that usually occurs at the surface fo a liguid over a wide range opf tempatures
deposition change in state from gas directly to a solid
boiling a rapid change from a liquid to a gas or vapor
Created by: 18hfreshman1104