MTL200 Exam Questions with Complete Solutions
6 properties of a solid material
1)Mechanical
2)Electrical
3)Thermal
4)Magnetic
5)Optical
6)Deterioration (chemical reaction)
Classification of Metals (5 types)
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)
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)
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)
1)Come from 2 or more types of material (metals, ceramics, polymers)
2)Designed to achieve multiple properties
Semiconductors
Both an insulator and a conductor
Electrons in Atoms
Electrons only have specific values of energy, if energy levels change, electrons must make a
quantum jump
How do electrons quantum jump? (2 points)
1)Either by absorbing energy and moving up
2)Or by releasing energy and moving down
Quantum Numbers (4 parameters to describe e)
1)Size
2)Shape
3)Spatial orientation
4)Probability density
Principle Quantum Number 1 (shell letter, and sub-shell)
Shell letter K
Sub-shell S
Principle Quantum Number 2 (shell letter, and sub-shell)
Shell letter L
Sub-shell s,p
Principle Quantum Number 3 (shell letter, and sub-shell)
, Shell letter M
Sub-shell s,p,d
Principle Quantum Number 4 (shell letter, and sub-shell)
Shell letter N
Sub-shell s,p,d,f
Electron Spin Movement
+1/2, -1/2
Ground State
electrons occupy all the lowest energy states
Hydrogen ground state
1s^1
Helium
1s^2
Sodium
1s^2,2s^2,2p^6,3s^1
Electropositive
elements capable of giving up electrons
Electronegative
elements ready to accept electrons
Bonding Energy
Eo=energy required to separate the atoms
The Primary Bond (3 types)
6 properties of a solid material
1)Mechanical
2)Electrical
3)Thermal
4)Magnetic
5)Optical
6)Deterioration (chemical reaction)
Classification of Metals (5 types)
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)
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)
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)
1)Come from 2 or more types of material (metals, ceramics, polymers)
2)Designed to achieve multiple properties
Semiconductors
Both an insulator and a conductor
Electrons in Atoms
Electrons only have specific values of energy, if energy levels change, electrons must make a
quantum jump
How do electrons quantum jump? (2 points)
1)Either by absorbing energy and moving up
2)Or by releasing energy and moving down
Quantum Numbers (4 parameters to describe e)
1)Size
2)Shape
3)Spatial orientation
4)Probability density
Principle Quantum Number 1 (shell letter, and sub-shell)
Shell letter K
Sub-shell S
Principle Quantum Number 2 (shell letter, and sub-shell)
Shell letter L
Sub-shell s,p
Principle Quantum Number 3 (shell letter, and sub-shell)
, Shell letter M
Sub-shell s,p,d
Principle Quantum Number 4 (shell letter, and sub-shell)
Shell letter N
Sub-shell s,p,d,f
Electron Spin Movement
+1/2, -1/2
Ground State
electrons occupy all the lowest energy states
Hydrogen ground state
1s^1
Helium
1s^2
Sodium
1s^2,2s^2,2p^6,3s^1
Electropositive
elements capable of giving up electrons
Electronegative
elements ready to accept electrons
Bonding Energy
Eo=energy required to separate the atoms
The Primary Bond (3 types)
