Lập PTHH và cho biết tỉ lệ số nguyên tử, số phân tử của các chất trong mỗi phản ứng: a) Fe + Cl2 - - -> FeCl3 b) Cu + O2 - - -> CuO
c) K + H2O - - -> KOH + H2 d) KOH + CuCl2 - - -> Cu(OH)2 + KCl
e) Al + O2 - - -> Al2O3

fire could start, buildings collapsing, and ash falling from the sky.

explanation:

this is because the buildings or plants could catch on fire and the buildings would most likely collapse. lastly ash would fall because all the burning would cause ash to fall from the sky.

hope this .

lol idk man i guess u gotta ask bill nye the science guy

hydrocarbons are organic compounds that contain only hydrogens and carbons. they can be saturated (those which contain only carbon-carbon single bonds) or unsaturated (those which contain carbon-carbon double or triple bonds) in nature. hydrocarbons can undergo several reactions like substitution, elimination etc.  

on substituting one or more hydrogen atoms in hydrocarbon it results in the formation of haloalkane. as the halogen atoms are large compared to the carbon and hydrogen atoms, due to which the molecular weight increases and the bond become polar because of presence electronegative halogen atom and results in the increase in boiling point of the haloalkane.

thus, the correct option is (b) that is the boiling point of the new compound increases on substituting a hydrogen atom with a halogen in a hydrocarbon.