Explain why the lattice energy and the energy of crystallization of a substance differ in sign but are equal in magnitude.

Which substances have the lowest melting points: ionic covalent, or metallic

Compare the valence electron configuration of the nobles gas elements seen here. what statement is correct?

Asample of ammonia reacts with oxygen as shown. 4nh3(g) + 5o2(g) 4no(g) + 6h2o(g) what is the limiting reactant if 4.0 g of nh3 react with 8.0 g of oxygen? o2 because it produces only 0.20 mol of no. nh3 because it produces only 0.20 mol of no. o2 because it produces two times less no than nh3. nh3 because it produces three times more no than o2.