
13.4Q) Leather
Authored by Ryan Trott
Physics
9th - 12th Grade
NGSS covered
Used 2+ times

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8 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Covalent bonding is chemical bonding from...?
...the attraction of positive metal ions and delocalized electrons.
...sharing of electron pairs between atoms.
...the transfer of electrons between atoms.
...the attraction between electronegative atoms and lone pairs.
Tags
NGSS.HS-PS1-1
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Covalent bonding gets stronger if...
...there are more delocalized electrons.
...there are more shared electrons.
...the size of the atoms get bigger.
...the mass of the atoms get bigger.
Tags
NGSS.HS-PS1-1
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Covalent bonds require...
...high energy to break.
...moderate energy to break.
...low energy to break.
Tags
NGSS.HS-PS1-4
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Hydrogen bonding is chemical bonding from...?
...the attraction of positive metal ions and delocalized electrons.
...sharing of electron pairs between atoms.
...the transfer of electrons between atoms.
...the attraction between electronegative atoms and lone pairs.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which mechanical properties have high values in most leather?
Viscoelasticity
Malleability
Density gradient
Grain structure
Tear resistance
6.
CATEGORIZE QUESTION
3 mins • 1 pt
Categorize:
Groups:
(a) Macroscopic
,
(b) Microscopic
,
(c) Atomic/Molecular
,
(d) Subatomic
Non-metal elements
Triple helix structure
Tanning proces
Type of collagen fibrils (I, III, IV)
Cross-linking
Porosity
Fatliquoring
Density gradient
Covalent bonds
Hydrogen bonds
Fibre network
Hydrophilic/-phobic interactions
7.
MATCH QUESTION
1 min • 1 pt
Match the following
Hydrophobic interactions
the polar (attractive) interactions with water, influences the water-resistance and permeability properties of leather
Hydrophilic interactions
The chemical bonds that connect the polymer chains in elastomers, providing stability and memory of the relaxed state
Cross-linking
make up the fibrous structure of leather, with type I providing high strength and types III and IV forming the fine-grained structure of the grain
Type of Collagen
the nonpolar (repellent) interactions with water, influences the water-resistance and permeability properties of leather
Triple helix structure
The arrangement of three α polypeptide chains in a helical conformation that makes up the collagen molecules, which are the fundamental building blocks of the leather structure
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