A student is asked to model gas pressure using two walls and a ball connected to a string, as shown. The ball represents a gas particle. The student swings the ball so it hits the two walls alternately, How should the student change the setup to show an increase in pressure caused by an increase in temperature?

ummm i think move the two walls together

Explanation:

hope this helps

im not exactly sure but i think its b!

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.