Jerome observes that a gas is formed when two liquids are mixed together. Which of the following best names and explains the change that
causes the formation of the gas?
Chemical change
state of the original substances is formed
8 EE 3
Physical change,
state of the original substances is formed
EE
Chemical change,
anges the form of the substances but not their identity
Physical change, because mixing only changes the form of the substances but not their identity

the answer is a. co2, this would be colder than the : )

explanation:

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.