Question

what are the things we can observe as a result of chemical change in addition
to new products?
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Answer 1

Answer:

Evidence of a chemical change

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. Change of composition - paper turning to ash when burned. Light and/or heat given off.

Explanation:

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Answer 2

A chemical reaction is usually accompanied by easily observed physical effects, such as the emission of heat and light, the formation of a precipitate, the evolution of gas, or a color change.