Question

What changes in physical properties can be used as evidence that a chemical reaction has occurred? Please list three or more.

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Answer 1

if the reaction is a chemical change, new substances with different properties and identities are formed. This may be indicated by the production of an odor, a change in color or energy, or the formation of a solid.

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Answer 2

The change of color, odor, and heat within the properties of the object can prove that a chemical reaction has occurred.