CHEM120 INTRODUCTION GENERAL
ORGANIC BIOLOGICAL CHEMISTRY
REVIEW EXAM SCRIPT 2026 SOLVED
QUESTIONS WITH FULL SOLUTION
GRADED A+
◉ molecular compound Answer: only nonmetals
◉ valence electrons Answer: the electrons in the outermost shell of an
atom.
◉ When its asked fir atoms Answer: you don't need the charge
◉ When its asked for ions Answer: you need the charge
◉ ZA X Answer: X = element symbol
Z = atomic number (protons)
A = mass number (protons + neutrons)
◉ NH4+ Answer: Ammonium
◉ SO4^2- Answer: Sulfate
◉ SO3^2- Answer: Sulfite
ORGANIC BIOLOGICAL CHEMISTRY
REVIEW EXAM SCRIPT 2026 SOLVED
QUESTIONS WITH FULL SOLUTION
GRADED A+
◉ molecular compound Answer: only nonmetals
◉ valence electrons Answer: the electrons in the outermost shell of an
atom.
◉ When its asked fir atoms Answer: you don't need the charge
◉ When its asked for ions Answer: you need the charge
◉ ZA X Answer: X = element symbol
Z = atomic number (protons)
A = mass number (protons + neutrons)
◉ NH4+ Answer: Ammonium
◉ SO4^2- Answer: Sulfate
◉ SO3^2- Answer: Sulfite