L If 25 g of hot water is added to 35 g of cold water, explain the energy exchange
between the two fluids.

? you expect us to answer this? ? this is your schoolwork, i don't think we can with this, i think it would considering being

what are the statements

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.