Chemical bonding and Density

[leo]

This may sounds really ridiculous to ask but I really don't know this.

And I really need some answers!!

 

How chemical bonds affect the density of molecules?

Is there such thing like which bonds formed between bond will affect the density of particular molecules?

Is there comparison made between the density of molecules formed by different bonds such as hydrogen bonds, covalent bonds, ionic bonds, disulphide bonds or etc?

 

Is it just the molecular mass that affect the density?

 

Is there explanation why Iron and water decreases in volume when they change from solid form to liquid form?

 

(Need someone to help me on this!! Spammer pls leave!)