Pleasee help asap pleasee

This chart represents the melting point of several substance. what besy explains the high melting point of the salt?

Which compound contains both ionic and covalent bonds? a) hbr b)cbr4 c)nabr d) naoh

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.