MTL 200 UPDATED Questions and
CORRECT Answers
6 properties of a solid material - CORRECT ANSWER✔✔- 1)Mechanical
2)Electrical
3)Thermal
4)Magnetic
5)Optical
6)Deterioration (chemical reaction)
Classification of Metals (5 types) - CORRECT ANSWER✔✔- 1)Composed of at least 1
metallic element
2)Atoms arranged orderly
3)Relatively Dense
4)Relatively Stiff and Strong
5)Good conductors of heat and electricity
Classification of Ceramics (4 types) - CORRECT ANSWER✔✔- 1) Compounds between
metallic and nonmetallic elements
2) Commonly (oxides, nitrides, carbides)
3) Relatively stiff and strong
4)Very brittle (high susceptibility to fractures)
Classification of Polymers (6 types) - CORRECT ANSWER✔✔- 1)The family of plastic and
rubbers
2)Large molecular structures
3)Can be ductile/pliable
4)Known to soften/decompose over time
5)Low electric conductivity
6)Nonmegnetic
,Classification of Composites (2 types) - CORRECT ANSWER✔✔- 1)Come from 2 or more
types of material (metals, ceramics, polymers)
2)Designed to achieve multiple properties
Semiconductors - CORRECT ANSWER✔✔- Both an insulator and a conductor
Electrons in Atoms - CORRECT ANSWER✔✔- Electrons only have specific values of
energy, if energy levels change, electrons must make a quantum jump
How do electrons quantum jump? (2 points) - CORRECT ANSWER✔✔- 1)Either by
absorbing energy and moving up
2)Or by releasing energy and moving down
Quantum Numbers (4 parameters to describe e) - CORRECT ANSWER✔✔- 1)Size
2)Shape
3)Spatial orientation
4)Probability density
Principle Quantum Number 1 (shell letter, and sub-shell) - CORRECT ANSWER✔✔- Shell
letter K
Sub-shell S
Principle Quantum Number 2 (shell letter, and sub-shell) - CORRECT ANSWER✔✔- Shell
letter L
Sub-shell s,p
Principle Quantum Number 3 (shell letter, and sub-shell) - CORRECT ANSWER✔✔- Shell
letter M
Sub-shell s,p,d
Principle Quantum Number 4 (shell letter, and sub-shell) - CORRECT ANSWER✔✔- Shell
letter N
, Sub-shell s,p,d,f
Electron Spin Movement - CORRECT ANSWER✔✔- +1/2, -1/2
Ground State - CORRECT ANSWER✔✔- electrons occupy all the lowest energy states
Hydrogen ground state - CORRECT ANSWER✔✔- 1s^1
Helium - CORRECT ANSWER✔✔- 1s^2
Sodium - CORRECT ANSWER✔✔- 1s^2,2s^2,2p^6,3s^1
Electropositive - CORRECT ANSWER✔✔- elements capable of giving up electrons
Electronegative - CORRECT ANSWER✔✔- elements ready to accept electrons
Bonding Energy - CORRECT ANSWER✔✔- Eo=energy required to separate the atoms
The Primary Bond (3 types) - CORRECT ANSWER✔✔- 1)Ionic
2)Covalent
3)Metallic
Ionic Bonding (3 points) - CORRECT ANSWER✔✔- 1)The transfer of electrons
2)The attraction bonding forces are coulombic (positive-negative ions)
3)Nonderectional
Covalent bonding (3 points) - CORRECT ANSWER✔✔- 1)the share of electrons
2)directional
3)Non-metallic elements
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