MEC281 TUTORIAL
EM/JUNE14/MEC281
UNIVERSITI TEKNOLOGI MARA
MEC281 MATERIAL SCIENCE
Chapter 1: Structure
TUTORIAL 1: Atomic Structure
1. Define :
i.
Atomic Mass
ii.
Atomic Number
iii.
Isotopes
2. Give the electron configurations for the following ions :
i.
Oxygen
ii.
P5+
iii.
Ni2+
iv.
Br-
v.
Cu
PERIODIC TABLE
MEC 281
EM/JUNE2014/MEC281
UNIVERSITI TEKNOLOGI MARA
MEC281 MATERIAL SCIENCE
Chapter 1: Structure
TUTORIAL 2: INTERATOMIC BONDING, CRYSTAL STRUCTURES
1. Specify the type of atomic bonding for each of the following materials:
a. Magnesium oxide (MgO)
b. Tungsten (W)
2. Describe the types of primary bonds and differentiate between these primary
bonds.
3. Sketch the bonding between Mg and O and identify the possible properties for the elements. Given the atomic number for Mg and O are 12 and 8, respectively.
4. Briefly describe the principal types of bond which exist between Fe atoms and discuss the influences of this bond on the electrical properties of Fe.
5. Explain why silicon carbide (SiC) has a higher melting point (Tm) than polyvinyl chloride (PVC). The Tm was given in Figure 1.
Materials
Melting point (Tm)(oC)
SiC
2730
PVC
100-260
Figure 1
EM/JUNE2014/MEC281
UNIVERSITI TEKNOLOGI MARA
MEC281 MATERIAL SCIENCE
Chapter 1: Structure
TUTORIAL 3 : Density, Atomic Packing Factor (APF) and Miller Indices
1. If Nickel (FCC) has an atomic radius of 0.124nm, calculate the volume of unit cell. Compute its density and compare theoretical answer with actual answer.
State at least TWO reasons why those answers are different.
Given that:
Atomic weight of Nickel
: 58.69 g/mol
Avogadro’s Number
: 6.023 x 1023 atom/mol
Theoritical density of Nickel : 8.90 g/cm3
2. Calculate the radius of Palladium atom, given that Pd has a FCC crystal structure, a density of 12.00g/cm3 and atomic weight of 106.4g/mol.
3. Listed below are the atomic weight, density and atomic radius of metal A.
Determine whether the crystal structure of metal A is face centered cubic
UNIVERSITI TEKNOLOGI MARA
MEC281 MATERIAL SCIENCE
Chapter 1: Structure
TUTORIAL 1: Atomic Structure
1. Define :
i.
Atomic Mass
ii.
Atomic Number
iii.
Isotopes
2. Give the electron configurations for the following ions :
i.
Oxygen
ii.
P5+
iii.
Ni2+
iv.
Br-
v.
Cu
PERIODIC TABLE
MEC 281
EM/JUNE2014/MEC281
UNIVERSITI TEKNOLOGI MARA
MEC281 MATERIAL SCIENCE
Chapter 1: Structure
TUTORIAL 2: INTERATOMIC BONDING, CRYSTAL STRUCTURES
1. Specify the type of atomic bonding for each of the following materials:
a. Magnesium oxide (MgO)
b. Tungsten (W)
2. Describe the types of primary bonds and differentiate between these primary
bonds.
3. Sketch the bonding between Mg and O and identify the possible properties for the elements. Given the atomic number for Mg and O are 12 and 8, respectively.
4. Briefly describe the principal types of bond which exist between Fe atoms and discuss the influences of this bond on the electrical properties of Fe.
5. Explain why silicon carbide (SiC) has a higher melting point (Tm) than polyvinyl chloride (PVC). The Tm was given in Figure 1.
Materials
Melting point (Tm)(oC)
SiC
2730
PVC
100-260
Figure 1
EM/JUNE2014/MEC281
UNIVERSITI TEKNOLOGI MARA
MEC281 MATERIAL SCIENCE
Chapter 1: Structure
TUTORIAL 3 : Density, Atomic Packing Factor (APF) and Miller Indices
1. If Nickel (FCC) has an atomic radius of 0.124nm, calculate the volume of unit cell. Compute its density and compare theoretical answer with actual answer.
State at least TWO reasons why those answers are different.
Given that:
Atomic weight of Nickel
: 58.69 g/mol
Avogadro’s Number
: 6.023 x 1023 atom/mol
Theoritical density of Nickel : 8.90 g/cm3
2. Calculate the radius of Palladium atom, given that Pd has a FCC crystal structure, a density of 12.00g/cm3 and atomic weight of 106.4g/mol.
3. Listed below are the atomic weight, density and atomic radius of metal A.
Determine whether the crystal structure of metal A is face centered cubic