In which of the compounds ch4, nh3, h2o, sih4, or h2s is δ+ for hydrogen the greatest? select the single best answer?

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Explanations:- When the covalent bond is formed between two different atoms then the more electron negative atom has and the less electron negative atom has charge.  More is the electron negativity difference, greater is the charge separation.

Looking at all the given molecules, Oxygen is most electron negative and hydrogen is less electron negative(hydrogen is more electron negative than Si). So, the best choice is .

a pan containing water is placed in a positio n where it is exposed to a 10 mile per hour wind. the pan contains a uniform depth of 1.27 cm of water, is quite wide, and has a length of 2.44 m in the wind direction. the water in the pan is at a constant temperature of 15.5 °c.