Answer :
Beakers 1, 2, and 3 experienced a chemical change as evidenced by the formation of a solid in beaker 1, bubbling in beaker 2, and a color change in beaker 3, all of which are indicators of chemical reactions. Beaker 4's outcome is unclear without further information on the changes observed after mixing the red and blue liquids.
The question revolves around distinguishing which beakers experienced a chemical change based on the observations listed after mixing different liquids. Chemical changes are typically accompanied by a number of indicators including unexpected color changes, formation of gases (bubbling) that are not due to boiling, formation of a solid substance (precipitate), and temperature changes.
Based on the provided information:
- Beaker 1: The formation of a solid substance suggests a chemical reaction, as new chemical bonds are likely forming resulting in a new solid product.
- Beaker 2: Bubbling indicates gas formation, which is an indicator of a chemical change.
- Beaker 3: The two colorless liquids turning yellow indicates a chemical reaction, with a new substance with a different color being produced.
- Beaker 4 is not clearly described; without knowing the result of mixing the red and blue liquids, we can't confirm a chemical change.
Hence, beakers 1, 2, and 3 exhibited chemical changes, while the change in beaker 4 cannot be determined with the information given.
