Answer:
D
Explanation:
The answer should be that the solution is unsaturated
It can be determined by 2n^2 formula
where "n" is the no of shell:
1st shell = 2n^2 = 2(1)^2 = 2*1 = 2 electrons
2nd shell = 2n^2 = 2(2)^2 = 2*4 = 8 electrons
3rd shell = 2n^2 = 2(3)^2 = 2*9 = 18 electrons
4th shell = 2n^2 = 2(4)^2 = 2*16 = 32 electrons.
Difference Between Empirical and Molecular Formulas. The key difference between empirical and molecular formulas is that an empirical formula only gives the simplest ratio of atoms whereas a molecular formula gives the exact number of each atom in a molecule. In chemistry, we often use symbols to identify elements and molecules.
Hope I helped :)
Answer:
C
Explanation:
Control over nitrogenase activity is accomplished by NH4+ prevents expression of the genes that encode nitrogenas.
Nitrogenase synthesis in free-living N2-fixing bacteria is universally under repressor control by ammonia. This, however, is not
the case for rhizobia. A need for N2 as inducer apparently does not
exist. The degree of ammonia repression is unusual in its strength.
Nitrogenase activity is at least 1O,OOO-fold lower in extracts of
NH4+-grown cells versus N2-grown cells.
