Concerning the disposal of materials at the end of the experiment, which methods are safe? check all that apply.
1. dump the acids and bases down the drain so they can be combined with sewer water.
2. dispose of ph paper in the trash.
3. dump the cabbage indicator solution down the drain.
4. ask your teacher to neutralize the acids and bases before disposal.
2, 3, 4.

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.

stratosphere, is the answer for (apex)