Answer : Molecular compounds dissolve in water by means of dipole-dipole attractions and hydrogen bond attractions. These attractions between the molecular compound and water don't form ions when a molecular compound dissolves.
Explanation: I hoped that helped,
Answer:
Elements in the periodic table are arranged from atomic number, increasing as you move more towards the right direction.
If its a acid it will be 3 or if its a alkali then 14 or neutral then 7
Answer:
The value is 
Explanation:
Generally the reaction between oxygen and magnesium is

Generally from the law of mass conservation in a chemical reaction we have that

Here
is the mass of magnesium
is the mass of oxygen
is the mass of magnesium oxide
So

=> 
=> 