Question

A chemist who studies water samples did a demonstration of how to test for lead in water. She added a clear solution of potassium iodide to a clear solution of lead nitrate. Then a yellow swirling solid formed in the liquid.

What is most likely true about the yellow solid?

A.
It is solid lead nitrate.
B.
It was secretly added to the test tube by the scientist.
C.
It is a new substance with different properties.
D.
It is solid potassium iodide.

Answer 1

B

Step-by-step explanation:

There's no explanation please can you help me

Answer 2

C. It is a new substance with different properties.

Step-by-step explanation:

Potassium iodide reacts with lead nitrate ⇒ lead iodide and potassium nitrate

potassium nitrate: water-soluble

lead iodide: only partially water-soluble

so, [most] lead iodide precipitates out of solution, as a yellow solid

this means that the yellow solid being formed is not potassium iodide, not lead nitrate, not added secretly, but a new substance (lead(II) iodide) with different properties)