Answer:
Two electrons fit in the first shell out from the nucleus and eight fit in the second. Every element with more protons than the two of Helium needs to work on shells outside the first one. one you get to ten, you have filled the first two shells.
In a water molecule, oxygen forms one covalent bond with EACH of TWO hydrogen atoms. As a result, the oxygen atom has a stable arrangement of 8 valence electrons. Each hydrogen atom forms only one bond because it needs only two electrons to be stable.
I believe Winter is <span>your answer.</span>
Answer : The molar concentration of solution is 
Explanation :
Using Beer-Lambert's law :
where,
A = absorbance of solution = 0.614
C = molar concentration of solution = ?
l = path length = 1.0 cm
= molar absorptivity coefficient = 
(assume)
Now put all the given values in the above formula, we get:
Therefore, the molar concentration of solution is
I believe the answer is B
Answer:
See below
Explanation:
The half-cell reduction potentials are
Ag⁺(aq) + e⁻ ⇌ Ag(s) E° = 0.7996 V
Co²⁺(aq) + 2e⁻ ⇌ Co(s) E° = -0.18 V
To create a spontaneous voltaic cell, we reverse the half-reaction with the more negative half-cell potential.
We get the cell reaction
:
Anode: Co(s) ⇌ Co²⁺(aq) + 2e⁻
<u>Cathode: 2Ag⁺(aq) + 2e⁻ ⇌ 2Ag(s) </u>
Overall: Co(s) + 2Ag⁺ (aq) ⇌ Co²⁺(aq) + 2Ag(s)
