I want to thank your team (Jeff) for finding a new writer when you were unable to reach my existing writer to revise my paper. I appreciate your professionalism and efforts. Thanks
Report (any type)/Brief report
22/09/2021
The short version: Sulfur is more electronegative than hydrogen, so the H-S bond is polar with electron higher on the sulfur atom. This leads to ##H_2S## being a polar molecule. However, the difference in polarity between H and S is very small, so neither the bond nor the molecule are very polar.
The longer version:
There is some controversy about this. The difference in electronegativities of hydrogen (2.20) and sulfur(2.58) is almost exactly the same as that between hydrogen and carbon (2.55). The C-H bond is viewed as non-polar and so, therefore, should the H-S bond. However, there is some polar character to a C-H bond. Its dipole moment is only 0.3 D, compared with 5.04 D for an OH bond.
We should therefore expect an H-S bond to have about the same dipole moment. Yet the measured molecular dipole moment of H₂S is 0.95 D. If this were due entirely to the polar S-H bonds, the S-H bond dipole must be about 0.8 D, with the negative end pointing to the S atom.
However, there is another explanation. Methane has a tetrahedral electron geometry, with two C-H bonds pointing to the lower left in the diagram and two C H bonds pointing to the upper left. Hydrogen sulfide has two S-H bonds pointing to the lower left. But, instead of two H atoms, there are now two lone pairs at the upper left.
Lone pairs contribute to the molecule’s dipole moment even though they do not constitute a ‘bond’. Clearly the sulfur ‘end’ of the lone pair is positive, and the electron ‘end’ is negative so one might think of a ‘lone pair dipole’ contributing to the polarity of the molecule in analogy to a bond dipole. Thus, it may be the lone pairs that make the major contribution to the polarity of the molecule.
Show more
I want to thank your team (Jeff) for finding a new writer when you were unable to reach my existing writer to revise my paper. I appreciate your professionalism and efforts. Thanks
Delivering a high-quality product at a reasonable price is not enough anymore.
That’s why we have developed 5 beneficial guarantees that will make your experience with our service enjoyable, easy, and safe.
You have to be 100% sure of the quality of your product to give a money-back guarantee. This describes us perfectly. Make sure that this guarantee is totally transparent.
Read moreEach paper is composed from scratch, according to your instructions. It is then checked by our plagiarism-detection software. There is no gap where plagiarism could squeeze in.
Read moreThanks to our free revisions, there is no way for you to be unsatisfied. We will work on your paper until you are completely happy with the result.
Read moreYour email is safe, as we store it according to international data protection rules. Your bank details are secure, as we use only reliable payment systems.
Read moreBy sending us your money, you buy the service we provide. Check out our terms and conditions if you prefer business talks to be laid out in official language.
Read more