Ch4 Matter and Energy (WIP)
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24 terms
Terms | Definitions |
|---|---|
 physical states | the three states held by matter: solid, liquid, gas |
| solid state | matter has a fixed shape and a fixed volume |
| liquid state | matter has a variable shape, but fixed volume |
| gaseous state | matter has a variable shape and volume, but compression is significant |
| sublimation | solid to gas |
| melting | solid to liquid |
| vaporizing | liquid to gas |
| condenses | gas to liquid |
| freezing | liquid to solid |
| deposition | gas to solid |
| heterogeneous mixture | can be separated into pure substances by physical methods, properties are indefinite and vary |
| homogeneous mixture | properties are definite constant for a given sample |
| alloy | a homogeneous mixture of two or more metals |
| substance | matter that has definite composition and constant properties |
| compound | predictable properties, but can be broken down into elements by ordinary chemical reactions |
| element | a substance that cannot be broke down further by a chemical reaction |
| chemical symbol | the abbreviated name of each element used to identify the element on the periodic table |
| atom | individual particles that make up an element |
| semimetal (or metalloid) | an element that typically has properties midway between those of metals and nonmetals |
| metal | an element that typically is a solid, has bright metallic luster, high density, high melting point, and good conductor of heat and electricity |
| malleable | property of metal meaning it can be hammered into a thin sheet of foil |
| ductile | if the metal can be drawn into a fine wire |
| nonmetal | an element that usually has low density, low melting point, and poor conductor of heat and electrity |
| atomic number | the number that identifies a particular element |
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