COMPREHENSIVE EXAM 2026 QUESTIONS
WITH SOLUTIONS GRADED A+
◉ valence electrons. Answer: electrons in the outermost shell
◉ molecular formula. Answer: A chemical formula that shows the
number and kinds of atoms in a molecule, but not the arrangement of the
atoms
◉ lewis structure. Answer: A structural formula in which electrons are
represented by dots; dot pairs or dashes between two atomic symbols
represent pairs in covalent bonds.
◉ condensed structural formula. Answer: structural molecular formula
showing the general arrangement of atoms but without showing all the
covalent bonds
◉ bond-line structure. Answer: A structure in which straight lines
represent carbon-carbon bonds.
◉ Isomers. Answer: Two different molecules that have the same
chemical formula