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Cards (35)
What is
matter
defined as according to
Merriam-Webster
?
Consisting of matter
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How does Cambridge define
matter
?
A
physical
substance that things can be made from
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What are
engineering materials
used for?
They are used in the construction of man-made
structures
and components
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How are
materials
classified?
Based on their
size
,
composition
,
physical
, and
chemical
properties
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What is a
metal
defined as?
A pure substance (
element
) that predominantly forms positive
ions
by losing
electrons
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What are the physical properties of
metals
?
They are mostly opaque, hard, heavy, ductile, and have
luster
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What defines an
alloy
?
An alloy is a metallic substance composed of two or more
elements
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What is the
composition
of an
alloy
?
It consists of a primary metal plus
impurities
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Why do
alloys
have
superior
physical
properties compared to
pure metals
?
Because they are composed of
multiple elements
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What type of bonding do metals and alloys exhibit?
Metallic bonding
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How is
metallic bonding
in
alloys
different from pure metals?
It is slightly more complex due to the mixture of different
atoms
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What does the
sea of electrons model
explain?
It explains
metallic bonding
and approximates the
malleability
and
ductility
of metals
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What are two physical properties of metals?
Malleable
and
ductile
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Why do
metals
conduct
electricity
and heat?
Due to the overlapping
valence band
and
conduction band
, allowing
electrons
to flow easily
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What happens to
atoms
in a
lattice
when heated?
They vibrate, resulting in efficient
heat transfer
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What is the
valence band
?
Where electrons can be found
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What is the
conduction band
?
Where
electrons
can move freely
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What are some real-life examples of
metals
and
alloys
?
Cookwares
Jewelries
Medals
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How are
polymers
classified?
Based
on certain factors
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What are the types of
polymers
based on
origin
?
Natural
Semi-Synthetic
Synthetic
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What are the
types
of
polymers
based on
structure
?
Linear
Branched
Cross-linked
Network
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What is a
linear polymer
?
A polymer with
monomers
arranged in a long and straight chain
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What is a
branched polymer
?
A polymer with additional
monomers
attached to the main chain
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What is a
cross-linked
polymer
?
A polymer with individual chains linked together in a three-dimensional framework
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What is a
network polymer
?
A polymer with high
cross-linking
resulting in a tightly connected framework
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What are the types of
polymers
based on thermal behavior?
Thermoplastic
Thermosetting
plastic
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What are the properties of
elastomers
?
Rubber-like
Stretched
cross-linked
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What are the properties of
fiber-reinforced polymers
?
Thread-like
High
tensile strength
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What are the properties of
thermoplastics
?
Melted and reshaped
repeatedly
Reusable
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What are the
properties
of
thermosetting plastics
?
Irreversible hardening upon heating
Extensive
chain cross-linking
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What
molecular forces
are present in
elastomers
?
London dispersion force
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What
molecular forces
are present in fiber-reinforced polymers?
Strong
covalent bonds
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What molecular forces are present in thermoplastics?
London dispersion force
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What
molecular forces
are present in thermosetting plastics?
Strong
covalent bonds
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What are the
properties
of
thermoplastics
compared to
thermosetting plastics
?
Thermoplastics can be reshaped and reused
Thermosetting plastics undergo irreversible hardening
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