In an isolated system, two copper bars at different temperatures transfer energy until both are at the same temperature. how would the
transfer of energy be different if the bars were in an open system?
a. energy transfer would occur only between the copper bars.
b. energy transfer would occur between the copper bars and the surroundings.
c. no energy transfer would occur between the copper bars or the surroundings.
d. energy transfer would occur only with the surroundings.

la respuesta es si te gusta hacer lo que siempre haces cuando nunca ves a alguien en el espejo porque sabes que no siempre están ahí.

it’s previous models   because when i picked that son of a gun’s answer it was wrong look for previous models because they might make it a different letter  

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.