why does a change in colour/temperature/state or formation of a precipitate indicates a chemical change. Explain with examples.
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A chemical reaction takes place when a chemical change occurs. So, if the colour or temperature changes or formation of ppt. Takes place, then a chemical change occurs i.e. a new substance is formed.
So, a chemical reaction occurs....
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A color change indicates the formation of a chemical change. ... Changes in color, a precipitate forming, a change in temperature or a change in pH indicate a chemical reaction is occurring. Phenolphthalein is an indicator that is clear.
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