What indicates a chemical change?
Understand the Problem
The question is asking what signs or indicators signify that a chemical change has occurred, and it provides multiple-choice options. We need to evaluate these options to identify which one correctly represents a chemical change.
Answer
Odor production, temperature change, gas production, precipitation, and color change indicate a chemical change.
The five major indicators of a chemical change are the production of odor, change in temperature, production of gas, formation of a precipitate, and change in color.
Answer for screen readers
The five major indicators of a chemical change are the production of odor, change in temperature, production of gas, formation of a precipitate, and change in color.
More Information
Chemical changes result in the formation of new substances with different properties and can often be difficult to reverse. The indicators help in identifying such changes by observable physical signs.
Tips
A common mistake is confusing chemical changes with physical changes, which do not result in new substances. Always look for new products as a sign of chemical change.
Sources
- Chemical Change Signs: Evidence - study.com
- What are some signs of chemical change? - SERC (Carleton) - serc.carleton.edu
- Evidence of Chemical Change - Let's Talk Science - letstalkscience.ca
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