Chemistry Test 8th grade/ vocab
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Created by:
sierramist19028 on November 22, 2009
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24 terms
Terms | Definitions |
|---|---|
 Chemistry | the study of the properties of matter |
| Matter | anything that has mass and takes up space |
| solution | a kind of homogeneous mixture, a mixture that forms when 1 substance dissolves another |
| homogeneous | a mixture in which different parts cannot be seen |
| heterogeneous | a mixture in which you can see the different parts |
| chemical bond | the force attraction between two atoms |
| atom | the basic particle of an element |
| substance | a single kind of matter that is pure |
| chemical formula | tells the elements and ratio of atoms in a compound |
| molecule | a particle formed when two or more atoms combined |
| can energy be released when matter changes? | yes |
| can matter change without energy? | no |
| energy | the ability to do work or cause change |
| element | a pure substance that cannot be broken down into other substances by chemical or physical means |
| temperature | a measure of the average energy of motion of the particles of a substance |
| compound | a pure substance made of two or more elements chemically combined |
| endothermic | a change in which energy is taken in |
| exothermic | a change in which energy is given off |
| protons | found in nucleus, has a + charge |
| neutrons | found in the nucleus, have NO charge |
| electrons | found outside the nucleus, - charge |
| thermal energy | the total energy of all particles in an object |
| how are elements and compounds related? | when elements are chemically combined, they form compounds having properties that are different from those of the uncombined elements |
| 2 ways in which mixtures differ from compounds? | each substance in a mixture keeps its individual properties. Also, the parts of a mixture are not combined in a set ratio. |
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