Which two industries account for 10% of the methane generated by human activities in the U. S.?

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

How many absorptions would you expect to observe in the 13c nmr spectra of the following molecules? a) 3-chloropentane b) cis-4-methyl-2-pentene

The diagram shows the relationship between scientific disciplines.the names of some scientific disciplines have been removed from the boxes. which scientific discipline belongs in the blue box? a.physics b.biology c.chemistry d.metallurgy