Scientists digging in a cave found an unknown substance. The scientists foundthat the substance's molecules were moving around each
other. The scientistsincreased the speed of the substance's molecules
and caused a phase change. How did the scientists do this, and how did
this affect the substance?The scientists transferred energy...

A. into the substance, and the substance changed into a gas.

B. into the substance, and the substance changed into a liquid.

C. out of the substance, and the substance charged into a solid.

D. out of the substance, and the substance changed into a liquid.

chemical digestion occurs in the stomach were hcl and pepsin forms chyme, the mouth in which salivary amylase breaks down starch to form bolus, and the small intestine specifically the duodenum.

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.