Respuesta :

thoshrthegod18

Answer:

depends

Explanation:

because different chemicals can react they all have different ways of showing a reaction. an example is  given: color, odor, texture  weight solidity

queenjosie

Answer:

U will know there is a chemical reaction, when  light, heat, color change, gas production, odor, or sound. The starting and ending materials of a physical change are the same

Explanation:

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