25 points + ! how do you calculate the number of molecules in a substance? for example, al2o3. (the numbers are subscripts) explain simply, to a point where a grade 9 can understand.

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current

catya your not at all which answer i've seen you do this on another question!

colorless gas, exhibiting a blue glow when placed in an electric field

b) solid

its a type of rock