A student observes what happens when two different aqueous solutions are mixed in a test tube. Which of the following observations would be most indicative of a precipitation reaction? Gas bubbles are produced.
There is a color change.
The test tube warms.
A solid settles out.

chemicals

Explanation:

yep

b. acid is the correct answer @jayxboof all social media

acid : acids are those which accepts an electron-pairs.

base : bases are those which donates ab electron-pairs.

alkali : it is a base that dissolves in water. it is basically a base and the ph greater than 7.

hydroxide ion : it is a poly-atomic ion which is negatively charged.

by cartels in other countries, shipped by air, mail, or land. i cant really see your answer choices : /