MgO has the same structure as NaCl. If the radii of O2- and Mg2 ions are 0.14 nm and 0.07 nm, respectively, determine (a) the packing factor and (b) the density of the material. The atomic weight of O is 16.0 g/mol and that of Mg is 24.3 g/mol.

The picture represents the process that produces most of the energy used by living organisms on earth. which process is represented in the picture? a) the magnetic attraction between two hydrogen nuclei. b) the fusion of hydrogen nuclei to produce a helium nucleus in the core of the sun. c) the fission of hydrogen nuclei to produce a helium nucleus in the core of the sun. d) the chemical reaction between hydrogen nuclei to produce a helium nucleus in earth's atmosphere.

What are the two basic types of satellites

A155.0 9 piece of copper at 182 °c is dropped into 2500 g of water at 23.9 °c. (the specific heat of copper is 0.385 1/9°c.) calculate the final temperature of the mixture. (assume no heat loss to the surroundings.)