Which changes are evidence of a chemical reaction?
Understand the Problem
The question is asking about the signs or indicators that suggest a chemical reaction has occurred. This typically includes changes such as color change, gas production, formation of a precipitate, temperature change, or change in smell.
Answer
Change in color, release of gas, formation of a precipitate, change in temperature, emission of light, and change in odor.
The final answer includes change in color, release of gas, formation of a precipitate, change in temperature, emission of light, and change in odor.
Answer for screen readers
The final answer includes change in color, release of gas, formation of a precipitate, change in temperature, emission of light, and change in odor.
More Information
These observations are indicators because they reflect changes at the molecular level where bonds are broken or formed, leading to new substances.
Tips
Common mistakes include confusing physical changes (like melting or boiling) with chemical changes. Always look for evidence indicating new substances are formed.
Sources
- Evidence of a Chemical Change - Chemistry LibreTexts - chem.libretexts.org
- Evidence of Chemical Change - Let's Talk Science - letstalkscience.ca
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