CHEM 120 INTRODUCTION TO GENERAL,
ORGANIC & BIOLOGICAL CHEMISTRY WEEK
8 FINAL EXAM REVIEW CHAMBERLAIN
COLLEGE
, lOMoAR cPSD| 19857451
CHEM 120: Final Review
1. Question: Know what is the atomic number, atomic mass, protons, neutrons &
electrons
Atomic number – is the number of protons in the nucleus of an atom of any
element
Atomic mass – is expressed in amu; is the wighted average
Protons – are positively charged particles in the nucleus
Neutron – are neutral, have no electrical charge
Electrons – are negatively charged particles in the nucleus
Atomic number = number of protons
Atomic number – (minus) atomic mass = neutrons
2. Question: Describe the shapes of molecules H2S, CBr4, & PCl3
H2S – bent
• Number of bonded atoms: 2
• Number of lone pairs: 2
• Number of electron sets: 4
CBr4 – tetrahedral
• Number of bonded atoms: 4
• Number of lone pairs: 0
• Number of electron sets: 4
PCl3 – pyramidal
• Number of bonded atoms: 3
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