Answer:
I think it's c (viewpoint)
..
answer=H+]=10-7
explain=the same way, a solution with a pH of 5 contains 10-5mol/l of hydrogen ions, a solution with a pH of 6 contains 10-6mol/l of hydrogen ions, while the solution with a pH of 7 contains 10-7mol/l of hydrogen ions
Answer:
The charges did not transfer from the cation to the anion to yield the correct subscripts
Explanation:
First of all, we see that we have and in this ionic compound. Since this is a substance, it has a net charge of 0. This means the charge of a cation should be balanced by the charge of the anion.
The lowest common multiple of 3 and 2 is 6, meaning we need:
- \frac{6}{3}=2 cations;
- \frac{6}{2}=3 anions;
Oxygen needs a total of 8 valence electrons, as it's the anion and it gains electrons to obtain an octet. We have 3 oxygen anions in total. Normally, oxygen has 6 electrons, so it needs to gain 2 electrons for each of the 3 oxygen atoms, that is, gain a total of 6 electrons. Those 6 electrons are donated by two aluminum atoms (each having 3 valence electrons), so two aluminum cations are balanced by three oxygen anions.
The Lewis diagram is correct, as it shows an octet on oxygen. We also have the correct charges. The subscripts, though, have to be 2 and 3 for Al and O respectively.
Answer:
The Answer is B: subtract atomic mass from atomic number. I remember doing this in 8th grade!!!:)
Explanation:
The number of electrons in a neutral atom is equal to the number of protons. The mass number of the atom is equal to the sum of the number of protons and neutrons in the nucleus. The number of neutrons is equal to the difference between the mass number of the atom and the atomic number.
Answer: The unknown solution had the lower concentration
Explanation: concentration will always move from higher to lower region. If the concentration of the unknown solution has increased, it therefore means that the initial concentration of the unknown solution was low