Q: If distance between Na+ & Cl-1 ions in Sodium chloride crystal is X pm, then edge
length of the unit cell is :
a) 4X pm
b) X/4 pm
c) X/2 pm
d) 2X pm

What is the main reason why some developing countries fear the increase the free trade policies around the world?

Ammonium perchlorate nh4clo4 is the solid rocket fuel used by the u. s. space shuttle. it reacts with itself to produce nitrogen gas n2 , chlorine gas cl2 , oxygen gas o2 , water h2o , and a great deal of energy. what mass of nitrogen gas is produced by the reaction of 2.1g of ammonium perchlorate?

Which of the following is true about the speed of light? it depends on the wavelength.