What is the relationship between enthalpies p, q, r and s?
S(s) + H2(g) -> H2S(g) AH=p
H2(g) + 2O2(g) -> H2O(1) AH=q
S(s) + O2(g) -> SO2(g) AH=r
H2S(g) + 1%O2(g) -> H2O(l) + SO2(g) AH=s

warm front forms when a moist, warm air mass slides up and over a cold air mass. as the warm air mass rises, it condenses into a broad area of clouds. a warm front brings gentle rain or light snow, followed by warmer, milder weather.

hope i !

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.