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Social Sciences 9 Online
OpenStudy (ttp):

Which of the following is an example of a chemical change? A bike rusting Mixing salt and pepper A brick breaking Gold melting

OpenStudy (anonymous):

The definition of a chemical change is a reaction that results in a species that did not exist before the reaction. Out of the options, there are 3 physical reactions, which do not involve chemical changes. Think of how these phenomenons occur and try to figure out whether if they have any chemical change.

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