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QuestionChemistry

"What visible signs indicate a precipitation reaction when two solutions are mixed? Select one or more: A. A hazy or cloudy appearance B. Solid settling out in the test tube C. A color change D. Bubbling in the test tube"
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Step 1
: Observe the appearance of the mixed solutions.

When two solutions are mixed and a precipitation reaction occurs, one of the visible signs is the formation of a hazy or cloudy appearance. This occurs due to the presence of solid particles suspended in the solution, which are the precipitates. So, option A is correct.

Step 2
: Examine the solid particles in the solution.

Another visible sign of a precipitation reaction is the solid settling out in the test tube. After some time, the solid particles may sink to the bottom of the test tube due to gravity. This is another indication that a precipitation reaction has taken place. So, option B is also correct.

Final Answer

A. A hazy or cloudy appearance B. Solid settling out in the test tube C. A color change (in some cases) D. Bubbling in the test tube (not common)

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