Author Phoebewilliams5 in Chemistry, 07.02.2018

Why are some examples of a chemical reaction not really foolproof evidence that of a chemical reaction? 13, 8th grade, and I'm doing my science lab report: The laboratory was a chemistry laboratory. We got a bunch of poisonous chemicals and place pairs of these together, recorded the reactions, and composed balanced equations for each of them and identified what kind of reaction they were. The whole name of the laboratory is"Evidence of Chemical Reactions", and one of the first diagnosis questions would be"write a paragraph about the sorts of changes you'd expect to determine if a chemical reaction happens." I answered this with things like bubble creation, change of color, change of state of matter, etc.. Then another question said"any one of these signs isn't always a fool proof sign that a chemical reaction is occurring. Provide two examples to support this statement."  What are two examples to support the statement that the commonly known examples of chemical reactions happening aren't always foolproof evidence that chemical reactions are happening?

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