Option C. A compound being separated into 2 elements represents a chemical change.
Answer:
The NH3 + with a PKa = 9.9
Explanation:
The Pka is a mathematical expression to express the dissociation grade of a substance in a solution, that means with a substance with a pKa small is a strong acid, and in this case since the solution pH is 8, that mean that the substance with high pKa ( lower acid strength) will predominate in a pH of 8.
well, without the article, I'm guessing the main idea is about the Great Wall of China
A positively charged nucleus with two protons and two neutrons hope this helps :)
