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Which of the following is a reliable way to observe that a chemical change has occurred when two substances come in contact with one another? Conduct a test to determine the chemical makeup of the molecules. Observe a color change. Test for the release of heat. Or Monitor for release of gas. I think it's observe a color change but I'm not sure

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While observing a color change is a common indicator of a chemical change, it is not the only reliable way to determine if a chemical change has occurred. All options you listed can be indicators of a chemical change:

  1. Color Change: Often indicates a new substance is formed.
  2. Release of Heat: This indicates an exothermic reaction, suggesting a chemical change.
  3. Release of Gas: Bubbles or gas formation typically signifies that a chemical change has occurred.

Given this, all of these observations are valid indicators of a chemical change, but simultaneously monitoring for gas release or detecting a significant temperature change can provide particularly strong evidence of a chemical change. Therefore, while checking for a color change is indeed a reasonable observation, it may be more reliable to consider the context of multiple indicators together when positively confirming a chemical change.