D Excretory systems regulate the chemical composition of body fluids by removing metabolic wastes and retaining the proper amounts of water, salts, and nutrients. Components of this system in vertebrates include the kidneys, liver, lungs, and skin.
That is not true. Chloroethane has a greater boiling point than ethane.
This is due to the greater intermolecular attraction forces.
The greater electronegativity of Cl than C's, creates a stronger atraction of the electron cloud toward Cl, driving to the formation of permanent dipoles.
Then, in addition to the dispersion forces (present in the ethane and chlorometane) there are forces due to the attraction between the permanent dipoles, which cause a higher boiling point.
REDOX is the process whereby electrons are transfered from one specie to another, via oxidation-reduction.
In a chemical reaction, when one specie causes another to gain electrons, it is called a reductant (it gives electrons). This is an oxidation reaction, because it loses electrons of its own. While the other specie goes through reduction from gaining electrons.
The polarity (dipolar moments) of the bonds can be predicted from the difference of electronegativities of the atoms.
To predict the polarity of the entire molecule you have to take into account the geometry of the molecule and the final vector resulting from the addition of all the dipolar moments.
H-O bonds in H2O are highly polar and the molecule is also polar.
C - Cl bonds in CCl4 are highly polar, but the symmetry of the molecule is such the they cancel each other and the molecular is nonpolar.
Answer: CCl4
