we use shears to cut these materials, they can be found in the siding department of a home improvement store (about $20).
correct ur question, sodium nitride is Na3N sodium nitrite is NaNO2 which one u want? Al2(SO4)3 is for aluminium sulfateIf u want to have only one Al in aluminium sulfate, (AlSO4)+ ion or AlSO4.Cl aluminium chloro sulfatethis is because, aluminium is ready to give 3 electrons in order to become more stableSO4 can accept 2 electronsthere is one more electron given by aluminiumtwo assess this, 2 Al atoms give total of 6 electron, and 3 SO4 groups accept a total of 6 electrons.
