| A | B |
|---|
| solid | fixed volume and state.matter held tightly in a rigid structure |
| liquids | fixed volume but variable shape. |
| gases | neither fixed shape or volume/ |
| reactant | chemical present in beginning and takes part in reaction |
| product | chemical produced by chemical reaction |
| exothermic reaction | energy released |
| endothermic reaction | energy absorbed |
| matter | anthing with mass and volume |
| volume | space an object occupies |
| mass | quantity of matter in object. constant |
| weight | force produced by gravity actign on mass |
| quantity | something that has magnitude or size |
| unit | standard used when measuring a quantity |
| density | ratio mass to volume |
| physical change | cutting, melting, boiling |
| chemical change | corroding, rusting, riping |
| atom | basic unit of matter |
| element | 111 simplest substances from which more complex substances are made |
| molecule | a neutral group of atoms held together by covalent bonds |
| allotrope | one of a number of different molecular or crystalline forms of an element |
| compound | the product that results when 2 or more different elements are chemically combined |
| ion | an atom or group of atoms with a electrical charge |
