Chemical Reactions
By: Aoife K.
Physical Change
Physical changes can be determined by color, taste, smell, lust, or by freezing or boiling point. If it dissolves or changes in size it has also been affected by physical changes. An example of this weathering or erosion. If you had a glass of water and you drank half of it you would have less than before but the water hasn't changed into something else in the glass.
Chemical Change
Chemical can be determined by the change you can see that looks different like when a candle burns the wax melts changing its texture. If you put fire on a log it will burn and begin to turn to ash and also change texture.
Precipitate
Cause (a substance) to be deposited in solid form from a solution.
Example: Cooking an egg results in formation of the gel around the yolk into egg white (protein precipitation).
Exothermic
(of a reaction or process) accompanied by the release of heat, this needs energy to work.
Example:
vinegar and baking sodaEndothermic
Generates energy, molecules break their bonding and this liberates energy.
Example: melting ice