A) MgO has the rock-salt structure. The MgO crystal has a value of 0.514 for the radius ratio. The length of a side of the unit cell for MgO is 4.24 Å.

(i) Draw the structure of this molecule.
(ii) Determine the radii of Mg 2+and O2-, assuming that the O 2-ions are in contact with one another.
(b) Define what is meant by the "coordination number" of a crystal structure.
(c) Determine the coordination number for each of the following crystal structures:
(i) Face-centred cubic (NaCl)
(ii) Body-centred cubic (CsCl)
(iii) Zinc blende (ZnS)

What kind of ion is contained in salts that produce an acidic solution? a positive ion that attracts a proton from water a positive ion that releases a proton to water a negative ion that attracts a proton from water a negative ion that releases a proton to water

Agas occupies 475 cm^3 at 313k. find its volume at 367k. you must show all of your work to receive credit. be sure to identify which of the gas laws you will be using

Calculate the ratio of h+ ions to oh– ions at a ph = 7. find the concentration of h+ ions to oh– ions listed in table b of your student guide. then divide the h+ concentration by the oh– concentration. record this calculated ratio in table a of your student guide. compare your approximated and calculated ratios of h+ ions to oh– ions at a ph = 7. are they the same? why or why not? record your comparison in table a. what is the concentration of h+ ions at a ph = 7? mol/l what is the concentration of oh– ions at a ph = 7? mol/l what is the ratio of h+ ions to oh– ions at a ph = 7? : 1