MSE 250 - EXAM 1 STUDY GUIDE
Types of Materials - Answer -Metals: strong, ductile, high conductivity
Polymers: plastic, soft, ductile, low strength and density
Ceramics: ionically bonded, brittle, glassy, elastic
Composites: Mix of the above
Metallography - Answer -study of the structure and constitution of metals
Cold Mounting vs. Heat Mounting - Answer -cold: mix resin and hardener, takes 4-24
hrs, transparent
hot: powder, use machine, expensive but quick
6 Categories of Solids - Answer -mechanical, electrical, thermal, magnetic, optical,
deteriorative (chemical reactivity)
Electronegativity - Answer -Ranges from 0.7 to 4.0, the larger the value the more likely
to bond
Ionic Bonding - Answer -donating/accepting e-, occurs b/w (+)/(-) ions, metal +
nonmetal, predominant bonding in ceramics
Covalent Bonding - Answer -Sharing of e-, occurs with similar electronegativity,
between nonmetals
Crystallography - Answer -Study of crystallographic arrangement
Atomic Arrangements - Answer -Body Centered Cubic, Face Centered Cubic, Simple
Cubic
Crystalline structures - Answer -exhibit long range order, positions are repetitive
Amorphous structures - Answer -No long range order, not periodic, nonrepeated and
random *results from rushed cooling
Polymorphism - Answer -when some materials have more than 1 crystal structure
Allotropy - Answer -Polymorphism in elemental solids, prevailing crystal structure
depends on both temp. and external pressure
Alloy - Answer -A mixture of two or more metals
Substitutional impurity - Answer -a different atom in the lattice structure
Vacancy - Answer -a spot where an atom is missing
Types of Materials - Answer -Metals: strong, ductile, high conductivity
Polymers: plastic, soft, ductile, low strength and density
Ceramics: ionically bonded, brittle, glassy, elastic
Composites: Mix of the above
Metallography - Answer -study of the structure and constitution of metals
Cold Mounting vs. Heat Mounting - Answer -cold: mix resin and hardener, takes 4-24
hrs, transparent
hot: powder, use machine, expensive but quick
6 Categories of Solids - Answer -mechanical, electrical, thermal, magnetic, optical,
deteriorative (chemical reactivity)
Electronegativity - Answer -Ranges from 0.7 to 4.0, the larger the value the more likely
to bond
Ionic Bonding - Answer -donating/accepting e-, occurs b/w (+)/(-) ions, metal +
nonmetal, predominant bonding in ceramics
Covalent Bonding - Answer -Sharing of e-, occurs with similar electronegativity,
between nonmetals
Crystallography - Answer -Study of crystallographic arrangement
Atomic Arrangements - Answer -Body Centered Cubic, Face Centered Cubic, Simple
Cubic
Crystalline structures - Answer -exhibit long range order, positions are repetitive
Amorphous structures - Answer -No long range order, not periodic, nonrepeated and
random *results from rushed cooling
Polymorphism - Answer -when some materials have more than 1 crystal structure
Allotropy - Answer -Polymorphism in elemental solids, prevailing crystal structure
depends on both temp. and external pressure
Alloy - Answer -A mixture of two or more metals
Substitutional impurity - Answer -a different atom in the lattice structure
Vacancy - Answer -a spot where an atom is missing
