In molecular weight distributions, what is the magnitude of the weight-average molecular weight (Mw) compared to the number average molecular weight (Mn)? Mn>Mw Mn=Mw Mw>Mn no consistent relationship Question 13 As the molecular weight of semi-crystalline thermoplastics increases: (a) melt temperature decreases, strength decreases, glass transition temperature decreases (b) melt temperature increases, strength increases, glass transition temperature increases (c) melt temperature increases, strength decreases, glass transition temperature increases Which of the following properties will NOT be directly affected by bond energy? melting point elastic modulus coefficient of thermal expansion ductility The dense packing in crystalline solids is the result of interatomic spacing associated with the lowest energy (most stable) configuration. True False Question 23 Of the three common metallic crystal systems which one has the highest fraction of void space? FCCHCPBCC all the same