When we heat zinc a white substance is produced. How is it possible for the white substance (product) to have a higher mass than zinc?

Lewis structure and molecular geometry for nh2cl

Calculate the number of molecules present in 0.750 mol of mgo.

Covalent bonds generally form when the bonded elements have a difference in electronegativity less than 1.5. subtract the electronegativities for the following pairs of elements and predict whether they form a covalent bond. electronegativity difference of c and c: ionic covalent electronegativity difference of mg and cl: ionic covalent