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Matter and Energy
Introduction to matter
Term | Definition |
---|---|
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 |