Cecil writes the equation for the reaction of hydrogen and oxygen below.
h2 + o2 → h2o

why does his teacher ask him to balance the equation by including the correct coefficients?

a. to show that most molecules exist in pairs
b. to show that most compounds exist in pairs
c. to show that atoms are conserved in chemical reactions
d, to show that atoms are created in chemical reactions

Its C i just took the quiz on edunuity

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.