Question

Which of the following causes a precipitate to form?

A. Atoms combining in a solution to form a solid
B. Volcanoes erupting and magma cooling
C. Lava crystallizing
D. Minerals undergoing changes in pressure

Answer 1

Answer: Option (A) is the correct answer.

Step-by-step explanation:

When in a chemical reaction, a liquid solution results in the formation of an insoluble solid then this solid is known as a precipitate.

For example,
`Pb(NO_(3))_(2)(aq) + 2NaI(aq) \rightarrow PbI_(2)(s) + 2NaNO_(3)(aq)`

Here
`PbI_(2)` solid formed is a precipitate as it remains insoluble in the reacting solution.

Hence, we can conclude that out of the given options atoms combining in a solution to form a solid causes a precipitate to form.

Answer 2

The correct answer is A. Atoms combining in a solution to form a solid

What this means is that atoms bond together to form a physical presence to appear and becomes deposited in a solution in solid form.