This illustration BEST represents the light A)
from the sky as the sun sets and the sky darkens and reddens.
B)
from the sky as the sun rises and the sky goes from black to light blue.
O
on a porch as porch lights are turned off leaving only the dim violet insect
light on
in a laboratory as all room lights are switched off and an intense
ultraviolet lamp is left on.
D

0

explanation:

488479

rvmoo+478)9.68

explanation: it gains negative electrons, therefore becoming negatively charged. as charge cannot be created, nor destroyed, only transferred, this leaves the wool positive. now that they have opposite charges, the two items attract.

the answer is definitely c.

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.