identify the mixtures in the following list. if there is more than one answer, select all that apply.
1. whole blood
2. gold(au)
3. air( mostly n2 and o2)
4. saline solution
5. alcoholic drink
6. table salt( nacl)
7. ethanol(ch3ch2oh)
8. elemental oxygen

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.