science

1. any chemical reaction that absorbs heat from its environment
3. a combination of two or more pure substances in which each pure substance retains its individual chemical properties
6. substance that cannot be broken down into simpler substances by chemical means.
8. to do with the release of heat
9. degree to which a substance dissolves in a solvent to make a solution

2. A rearrangement of the atoms or molecules of two or more substances that come into contact with each other, resulting in the formation of one or more new substances
4. substance that changes when it is combined with another substance in a chemical reaction
5. a measure of how quickly a specific material is capable of catching fire and burning.
7. the measurement of how tightly a material is packed together