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WorksheetsMatSci Prelims
Total questions: 50
Worksheet time: 13hrs 30mins
Which of the following is a metalloid?
Silver
Antimony
Bismuth
Aluminum
The following elements are non-metal, except?
Sodium
Beryllium
Radon
Rutherfordium
Choose all metallic elements from the following list. Tick all that applies
Neon
Krypton
Potassium
Technetium
Chromium
Subatomic particle that is positively charged
(a)
The kind of chemical bonding that atoms of one element give up their valence electron to be donated to another element.
(a)
Identify which kind of chemical bond exists on a given compound:
Lithium fluoride
(a)
Identify which kind of chemical bond exists on a given compound:
Ammonia
(a)
Identify which kind of chemical bond exists on a given compound:
Calcium chloride
(a)
Identify which kind of chemical bond exists on a given compound:
Pure iron
(a)
Identify which kind of chemical bond exists on a given compound:
H2O (water)
(a)
How many valence electron does sodium gives off to chlorine to become stable?
(a)
How many valence electrons does sulfur will accept from calcium to become calcium sulfide?
(a)
How many electrons does magnesium donates to fluorine to satisfy octet rule?
(a)
In magnesium fluoride, how many atoms of fluorine should be present to satisfy octet rule?
(a)
Which of the following describes SECONDARY BONDS? Check all that applies
atom to atom interaction
molecule to molecule interaction
stronger interaction compared to primary bonds
weaker interaction compared to primary bonds
No transfer or sharing of electrons
Identify what kind of secondary bond exist between
hydrogen bromide and hydrogen sulfide
Hydrogen bond
Dipole force
London Force
Identify what kind of secondary bond exist between
water and hydrogen carboxylic acid
dipole
london
hydrogen
Identify what kind of secondary bond exist between
iodine and nitrate
london
dipole
hydrogen
Identify what kind of secondary bond exist between
chlorine and carbon tetrabromide
london
dipole
hydrogen
Which one of the following elements is least likely to participate in a hydrogen bond?
Sulfur
Nitrogen
Fluorine
Oxygen
(a) structure in which the atoms are located at a specific position and a single unit of it can be repeated millions of times in a 3D pattern.
What are the basic characteristics of crystalline material? (choose all that applies)
the structure has repeating unit cell
volume increase as temperature increases with phase change
brittle
hard
Calculate the density of an element with atomic mass of 100 g/mol having BCC structure and a unit cell edge of 40 nm. The density of the element is (a) g/cc. (Express in 2 decimal places)
Calculate the density of gold, which has a face-centered cubic unit cell with an edge length of 407.8 pm. The density of gold is (a) g/cc. (Express your answer in 2 decimal places)
What is the volume of an element given that the crystal structure is FCC and the unit cell edge measures 200 pm? The volume is (a) x10^(-36) meters. (Express your answer in one significant figure)
An element crystallizes in a body-centered cubic structure. The unit cell volume is 2.583 x 10¯23 cm3. The radius of the element is ___________ pm. (Express your answer in 3 significant figures)
128
296
148
Check all elements with BCC structure
tungsten
molybdenum
aluminum
copper
titanium
Check all elements with FCC structure.
chromium
magnesium
zinc
nickel
lead
Check all elements with HCP structure
magnesium
titanium
zinc
iron
gold
Check all types of crystal defects.
point
line
surface
lattice
grain
What kind of defect is shown in the picture?
vacancy
ion-pair vacancy
interstitialcy
Frenkel defect
What kind of defect is shown in the figure?
vacancy
ion-pair vacancy
interstitialcy
Frenkel defect
What kind of defect is shown in the figure?
vacancy
ion-pair vacancy
interstitailcy
Frenkel defect
What kind of defect is shown in the figure?
vacancy
ion-pair vacancy
interstitialcy
Frenkel defect
On an edge dislocation, which region occurs compression?
gray region
blue region
white region
What kind of dislocation is shown in the figure?
edge
screw
surface
grain
TRUE OR FALSE:
An interruption in the surface of a lattice structure is considered an external surface defect.
(a)
TRUE OR FALSE:
An internal surface interruption is called grain boundaries.
(a)
Which of the following is TRUE about ELASTIC STRAIN?
top and bottom shear stresses should be in opposite direction
side stress on all faces should be opposite direction
top and bottom shear stresses should be in same direction
side stress on all faces should be on the same direction
What word best differentiate elastic strain from plastic strain?
(a)
Check all the reasons of crystal imperfection.
rapid cooling from high temperature
deformation of solids
high energy radiation
impurities
TRUE OR FALSE:
Each grain has its own unique lattice orientation; but collectively, the grains are randomly oriented in the block. This is called amorphous structure.
(a)
TRUE OR FALSE:
All polymers are amorphous structure.
(a)
TRUE OR FALSE:
Not all ceramics have crystalline structure.
(a)
Silica is an example of both crystalline and amorphous structures. Which form of silica is in amorphous structure?
glass
quartz
Carbon has many allotropes. Which of the following allotropes is considered in a crystalline structure?
pristine graphene
graphite
carbon nanotubes
Given the graph, which of the following is TRUE about amorphous structures? Check all that applies.
As the temperature increases, amorphous materials tend to expand more compared to crystals.
Amorphous has the tendency to change its phase as temperature increases.
Amorphous is more stable compared to crystals as the temperature increases.
TRUE OR FALSE:
Most metals have FCC structure. This causes metals to be ductile.
(a)
What are the characteristics of CERAMICS? Check all that applies.
high hardness
stiffness
electrically insulating
chemically inert
thermally conducting
What are the characteristics of POLYMERS?
repeating structure of monomer
low density
high thermal conductivity
high electrical resistivity
ductile
