what are the different changes which takes place during chemical change
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when the chemical change take place when there is a change in its mass, energy and new substance form and there is also change in its colour and there is the evolution of gas .
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The following can indicate that a chemical change has taken place, although this evidence is not conclusive: Change of odor. Change of color (for example, silver to reddish-brown when iron rusts). Change in temperature or energy, such as the production (exothermic) or loss (endothermic) of heat.
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