| Substances can be |
|
|
|
|
|
|
|
|
|
|
| • | 1. _________: substances that cannot be |
||||||||
| separated into
simpler substances by |
|||||||||
| chemical means. |
|||||||||
| • | 2.__________: substances composed of 2 or |
||||||||
| more elements
chemically united in fixed |
|||||||||
| proportions (as
CO2). Compounds can be |
|||||||||
| separated into
the elements that make it up |
|||||||||
| by chemical (not
physical) means |
|||||||||