Editing Notes On Observation Of A Chemical Reaction
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<center><b>Notes on Observations of a Chemical Reaction</b></center><br> <br> Stating that an observation of a chemical reaction is the substance has changed one or more of its properties (e.g. a new substance is produced) is not an observation of a chemical reaction. It is not an observation. Observations are statements from your five senses. So, what are the four observations of a chemical reaction.<br> <br> 1. A permenant color change.<br> 2. Gas is generated. Gas generated can be odorless or has an odor (so can't say gas formed and odor as two observations)<br> 3. Energy change. Either exothermic (energy/heat released) or endothermic (energy/heat absorbed) reaction.<br> 4. Precipitate formed. Precipitation is a solid formed in a liquid (or more correctly solution).<br> <br> For a chemical reaction to occur, at least one (but can any number) of these observation must occur.<br>
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