Question

Two chemicals at room temperature (about 23°C) were combined in a flask. At first, there were bubbles. Then, white flakes appeared at the bottom of the flask. After five minutes, the temperature of the solution was 33°C. A portion of the solution was used to measure its density and boiling point, which were determined to be 4.5 g/L and 82°C, respectively.

Did a physical or chemical change occur?
How do you know it is not the other kind of change? Provide at least three points of evidence that support your claim.

Answer 1

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