Station #14: Fun with Sodium Acetate, Sodium Acetate Initial Appearance:
Observations:
Type of Change:
Clue:
Station #15: Cold but Sublime. Cold
Initial Appearance:
Observations:
Type of Change:
Clue:
Questions:
1. Do any of the procedures give a clue that a chemical change occurred, but are not chemical
changes? Which ones?
2. Develop a definition of chemical change using atoms and molecules in your definition. Use
complete, grammatically correct sentences.

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.