It's peggy sue's birthday and she's about to blow out the candles on her cake. brother roger stops the party when he shouts: "look at that! chemical and physical changes taking places on your birthday cake! "
how would you respond to roger?
a) roger is incorrect. the melting wax is a physical change but there is no chemical change taking place.
b) roger is correct. lighting the match is a chemical change and burning the candles is a physical change.
c) roger is correct. the melting wax is a physical change and the burning candle wick is a chemical change.
d) roger is incorrect. only a chemical change is taking place as evidenced by the light and heat of the burning candles.

The correct answer is C). I really hope this helps yall. Plz mark me as Brainliest. :D

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

if you need further assistance, let me know: )

~ trueboss72

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.