In this lab "Physical and Chemical Changes" we developed a method to determine what kind of change has taken place, physical or chemical. During a physical change you do not alter the composition of the material, instead it changes the materials "physical" appearance and properties. To find evidence of a physical change you can ask yourself "Did the substance change or just its appearance?" For example when you chop wood you are cutting it into smaller pieces but it still is wood. A Chemical change is when you change the composition or "chemical make up" of a substance.In the lab a specific example is seen when you mixed silver nitrate with the copper wire and it turned black.Evidence of a chemical change is when you ask yourself "Is this a new substance and can you reverse it?" this is put in play when you burn a piece of paper and the ash is the new substance that shows the chemical change there's no changing the ash back to paper :).When i am stuck "in a scenario" i refer to my text book or chemistry notes.When polyacrylate and water are put together in the lab it is turned into ice crystals, a chemical change(changes form).
Enrichment:
This is a classic chemical reaction between the diet coke and mentos which make the bottle explode with carbon dioxide bubbles :D
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