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PLTW Materials And Stuff QUESTIONS AND ANSWERS 100% CORRECT | LATEST UPDATE 2025
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PLTW Materials And Stuff QUESTIONS AND ANSWERS 100% CORRECT | LATEST UPDATE 2025
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PLTW Materials And Stuff QUESTIONS ANDANSWERS 100% CORRECT | LATEST UPDATE
2025
Classification of elements - ANSWER Metals, nonmetals, and metaloids
Metals - ANSWER Good conductors of heat/electricity, hard, shiny, reflect light,
malleable, ductile, and one to three valence electrons
Nonmetals - ANSWER Most at room temperature, dull, brittle, powdery, and
poor conductors of heat/electricity
Metalloids - ANSWER Posses both metallic and nonmetallic properties.
Physical - ANSWER Boiling point, melting point, density, color, hardness,
texture
Chemical - ANSWER Acid, oxygen, and flammability
Compounds - ANSWER Element combinations are not random but based upon
specific mass ratios, can only be broken down through chemical processes.
Mixtures - ANSWER Non-chemical combination of any two or more substances
Most common material classification - ANSWER Metallic, ceramic, organic,
polymeric, and composite
, Metallic - ANSWER Thermal and electrical conductors, strength and plasticity,
pure metal elements(not commonly found/used) compounds, alloys, commonly
used due to properties.
Ceramic - ANSWER Compounds, metal and non metal elements, thermal and
electrical insulators, high strength at high temp, brittle.
Organic - ANSWER Are/were once living organisms, carbon and hydrogen,
genetically alterable, renewable and sustainable
Polymeric - ANSWER Mostly organic, low density, flexible and has elasticity
Composite - ANSWER More than one material, designed to obtain desirable
properties from each individual material
Mechanical properties - ANSWER Strength, hardness, ductility, and stiffness
Thermal properties - ANSWER Thermal capacity, conductivity, and expansion
Electrical conductivity materials - ANSWER Insulators, dielectrics,
semiconductors, semimetals, conductors, and superconductors
Oxidation and reduction occur in - ANSWER Corrosion and combustion
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