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In a lab, a scientist mixes a purple powder-like substance and a clear liquid together. The scientist observes that the two substances begin combining together, and he notices a gas begin to bubble out of the mixture. Did the scientist witness a chemical reaction? Why or why not?

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yes he witnessed a chemical reaction because the substances combining caused a gas to form, creating a new substance
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The scientist witnessed a chemical reaction because a gas was evolved when the two substances were mixed.

A chemical reaction is the same as a chemical change. When a chemical change occurs, atoms recombine to form new substances. Certain occurrences may accompany a chemical reaction such as;

  • Change in color
  • Evolution of gas
  • Appearance of a solid in an aqueous phase reaction
  • Sudden change in the temperature of the system.

When the scientist mixed purple powder-like substance and a clear liquid together, he noticed that a gas began to bubble out of the mixture. This implies that new substance has been formed so a chemical reaction has taken place.

Learn more: https://brainly.com/question/6284546

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