B. the atmosphere is an example of a mixture
I'm pretty sure it is the 2nd one.
A solution is the answer to a problem
Answer:
D
Explanation:
When lead ions and sulfate ions bond, they form sediment so neither a nor b can be the answer.
The important thing is that two nitrate ions were originally bonded with one lead ion, while two potassium ions bonded with a sulfate ion.
Finally, since potassium and nitrate ions don't form sediment these two ions must remain. Therefore the answer is D
Just breaking stuff so yea that’s it
