A student is given an unknown aqueous sample containing one of the three ions, Al3 , Ba2 , or Mg2 . There is limited unknown so the student can only run a couple of tests. Select all tests, based on the tables above, that will not provide useful information, even when performed correctly, to identify ions present in the unknown. Group of answer choices Na2CO3 Na2SO4 NH3 NaOH KI

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.

level 4 to level 2 : ))

answer; the numbers of valence electrons in the acetic acid molecule (ch3co2h) is 24;