JMU CHEM 120 FINAL EXAM 2026/2027
ACTUAL QUESTIONS WITH VERIFIED
ANSWERS.
Dalton's Atomic Theory - correct answer-- elements composed
of tiny particles called atoms
- all atoms of one element are identical & diff from atoms of
another element
- atoms combine to form compounds or molecules in simple
whole # ratios
- chemical rxns involve reorganization of atoms, but the atoms
themselves remain unchanged
J. J. Thomson- Cathode Ray - correct answer-Discovered
electron
Millikan's oil drop experiment - correct answer-Discovered
negative charge of electron and mass of electron
, `Rutherford's experiment - correct answer-Found...
1. atoms are mostly empty space
2. tiny dense nucleus in center
3. nucleus has a + charge to balance - electron
Element symbol - correct answer-A (top left): atomic mass,
protons + neutrons
Z (bottom left): atomic #, # of protons (always identifies
element)
X (middle): symbol
# of neutrons - correct answer-A-Z
Isotope - correct answer-Atoms of the same element that have
different numbers of neutrons
Average molar mass - correct answer-=Σ(mass
isotope)(%abundance/100%)
ACTUAL QUESTIONS WITH VERIFIED
ANSWERS.
Dalton's Atomic Theory - correct answer-- elements composed
of tiny particles called atoms
- all atoms of one element are identical & diff from atoms of
another element
- atoms combine to form compounds or molecules in simple
whole # ratios
- chemical rxns involve reorganization of atoms, but the atoms
themselves remain unchanged
J. J. Thomson- Cathode Ray - correct answer-Discovered
electron
Millikan's oil drop experiment - correct answer-Discovered
negative charge of electron and mass of electron
, `Rutherford's experiment - correct answer-Found...
1. atoms are mostly empty space
2. tiny dense nucleus in center
3. nucleus has a + charge to balance - electron
Element symbol - correct answer-A (top left): atomic mass,
protons + neutrons
Z (bottom left): atomic #, # of protons (always identifies
element)
X (middle): symbol
# of neutrons - correct answer-A-Z
Isotope - correct answer-Atoms of the same element that have
different numbers of neutrons
Average molar mass - correct answer-=Σ(mass
isotope)(%abundance/100%)
