You need the Avogadro's number. I can't remember exactly the calculation.
Increase, because you need heat to melt a solid to a liquid, so the temperature will have to get greater.
Answer:
Scientist used models to explain and predict the behavior of real object or system
Umm I’ll figure it out rn! Will come back in 1 min
Answer:
An Element is a substance made up of only one type of atom as like gold, copper, oxygen, etc.
Copper sulphate with molecular formula 
, the elements are copper, sulphur and oxygen. It is formed by combination of 
cation and 
anion.
Copper sulphide with molecular formula 
, the elements are copper and sulphur. It is formed by combination of cation and 
anion.
