Which density/temperature statement is correct? (3 points) select one: a. the density of freshwater increases as the temperature increases. b. the density of freshwater remains constant as temperature decreases. c. the density of saline (salty) water increases as temperature decreases. d. the density of saline (salty) water increases as temperature increases.

I believe that the best answer among the choices provided by the question is B. the density of freshwater remains constant as temperature decreases

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.