Select the 1 correct answer. An Iron bar at 200°C is placed in thermal contact with an identical iron bar at 120°C in an isolated system. After 30 minutes, both iron bars are at
160°C. If the iron bars were placed in thermal contact in an open system instead of an isolated system, how would the results be different?
Assume that the room temperature is 25°C.

A. The temperatures of the iron bars after 30 minuter' Nould be less than 160°C because heat would be lost to the surroundings.

B. it would take more than 30 minutes for both iron bars to reach 160°C because heat would be transferred less efficiently.

C. The temperatures of both iron bars would increase as they absorb heat from the surroundings.

D. The temperatures of both iron bars would decrease because pleces of them would be lost to the surroundings.

elements make up everything, and they combine to make compounds.

the answer is c

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.