Question

Na--NaOH--Na2SO4--NaCl--Na

Answer 1

1. 2Na + 2H2O = 2NaOH + H2
2. 2NaOH + H2SO4 = Na2SO4 + 2H2O
3. Na2SO4 + BaCl2 = BaSO4 + 2NaCl
4. 2NaCl (электролиз расплава)= 2Na + Cl2

Answer 2

2Na+2H2O=2NaOH+H2 2NaOH+H2SO4=Na2SO4+2H20 Na2SO4+BaCl2=2NaCl+BaSO4 2NaCl(электролиз расплава) = 2Na + Cl2

Answer 3

It looks like you've listed a sequence of chemical compounds, each separated by a double dash (--). The compounds you've listed are:

1. Na: Sodium (chemical symbol Na)
2. NaOH: Sodium Hydroxide, also known as caustic soda
3. Na2SO4: Sodium Sulfate
4. NaCl: Sodium Chloride, commonly known as table salt

This sequence seems to represent a chemical reaction or transformation involving these compounds. If you provide more context or details about what you're looking to understand or discuss, I'd be happy to help further!