Question

which indication of chemical reaction is not observed in this experiment? precipitate formation energy (temperature) change color change gas formation

Explanation:

The table shows white - cloudy appearance (precipitate formation in some cases), bubbles (gas formation), and no mention of color change or energy (temperature) change. Precipitate formation is seen as white, cloudy substances. Gas formation is indicated by bubbles. Since there is no indication of a change in color or a change in energy (temperature) in the table, we focus on the options. Energy (temperature) change is not observed as there is no information about heat or cold in the table.

Answer:

energy (temperature) change