Calculate the densities of Si and GaAs from the lattice constants (Appendix III), atomic weights, and Avogadro's number. Compare the results with densi- ties given in Appendix III. The atomic weights of Si, Ga, and As are 28.1,69.7, and 74.9, respectively.

What are the 4 phases of matter in order of increasing engery content?

13. a covalent bond between two atoms is likely to be polar if: a. one of the atoms is much more electronegative than the other. b. the two atoms are equally electronegative. c. the two atoms are of the same element. d. the bond is part of a tetrahedrally shaped molecule. e. one atom is an anion.

What is the rate law for the uncatalyzed reaction?