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Matter

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Term
Definition
Matter   Anything that has mass and takes up space  
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Mass   Amount of matter in an object  
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Weight   Measure of the gravitation force on an object  
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Volume   Amount of space an object takes up  
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Density   A measure of amount of mass in a given volume  
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Physical Property   Substance that can be observed and measured without changing the identity of the object  
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Chemical Property   Substance's ability to change into a new substance with different properties  
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Physical Change   Change that affects one or more physical properties of a substance  
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Chemical Change   Occurs when one or more substances change into entirely new substances  
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Law of conservation of mass   Ordinary chemical and physical changes, mass is not created or destroyed but only transformed into different substances  
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Atom   The smallest unit of an element that maintains the properties of an element  
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Element   Made up of one or more of the same kind of atom chemically combined  
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Compound   Made up of different kinds of atoms chemically combined.  
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Mixture   Contains a variety of elements and compounds that are not chemically combined with each other  
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Pure substance   Substance that has definite physical and chemical properties such as appearance, melting point, and reactivity  
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Heterogeneuous   Mixture that does not have a uniform composition  
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Homogeneous   Substances are evenly spread throughout  
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Solid   Substance has a different volume and shape  
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Liquid   Substance has a definite volume but not a definite shape  
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Gas   Does not have a definite volume or shape  
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Freezing   The change in state when a liquid becomes a solid  
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Melting   The change in state when solid becomes a liquid  
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Evaporation   As a liquid is warmed, its particles gain energy, Some particles gain enough energy that they escape from one surface of liquid and become a gas  
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Boiling   Rapid change from a liquid to a gas, or vapor  
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Condensation   The state of change from gas to liquid  
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Sublimation   The change from a solid directly to a gas  
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Deposition   The change from gas directly to a solid  
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