MEGR 3161 TEST 1 QUESTIONS AND ANSWERS

MEGR 3161 TEST 1 QUESTIONS AND
ANSWERS



Atomic structures - Correct Answers -- Atomic models
- Electron configuration
- Periodic table

Atomic bonding - Correct Answers -- Bonding force and energies: behaviors at
equilibrium
position
- Bonding related material properties
- different bonds

Different bonds - Correct Answers -Primary interatomic bonding: Ionic, Covalent,
andMetallic bonding
Secondary bonding (van der Waals bonding)
Which two crystal structures are the close-packed structures that have highest atomic
pack factor for metals:

HCP and BCC
BCC and FCC
FCC and HCP
Simple cubic and FCC - Correct Answers -FCC and HCP

What are the close-packed directions for a BCC structure? - Correct Answers -Body
diagonals

Bonding force: - Correct Answers -- Net force:FN=FA+FR

Potential energy: - Correct Answers -Net energy:EN=EA+ER

Ionic bonding: - Correct Answers -- Occurs between + and - ions.
- Requires electron transfer.
- Large difference in electronegativity required.
- Example: NaCl

Covalent bonding - Correct Answers -- Requires shared electrons.
- Electronegativities are comparable.
- Example: CH4