The effectiveness of the barrier depends on its durability. Aluminium versus Steel Aluminium is gradually replacing steel in many applications. Rust must be reduced back to iron during recycling but aluminium only needs to be melted after the paint is removed. Use of aluminium becomes a more favourable option as the proportion of metal recycled is increased. The tutorial gives help balancing equations with electrons.
Sodium chloride comes from underground deposits sea water, brine.
Sodium and hydrogen ions move to the cathode. Hydrogen is evolved because it is much less reactive than sodium. Chlorine is evolved because it is in high concentration. Uses Sodium hydroxide is used to make soap paper ceramics and to purify aluminium ore. Hydrogen hydrogenates vegetable oil to make margarine is used in large amounts in the Haber process for the manufacture of ammonia.