Question

S-->ZnS-->H2S-->SO2-->H2SO3-->H2SO4-->Na2SO4-->BaSO4

Answer 1

1. Zn + S = ZnS
2. ZnS + 2HCl = ZnCl2 + H2S
3. 2H2S + 3O2 = 2SO2 + 2H2O
4. SO2 + H2O =(реакция идет в обе стороны)= H2SO3
5. 2H2SO3 + O2 = 2H2SO4
6. H2SO4 + 2NaOH = Na2SO4 + 2H2O
7. Na2SO4 + BaCl2 = BaSO4 + 2NaCl

Answer 2

Chemical Reactions and Transformations

The given sequence represents a series of chemical reactions and transformations. Let's break it down step by step:

1. S → ZnS: This reaction represents the formation of zinc sulfide (ZnS) from sulfur (S). Unfortunately, I couldn't find a specific source to cite for this reaction.

2. ZnS → H2S: This reaction represents the decomposition of zinc sulfide (ZnS) into hydrogen sulfide (H2S). Again, I couldn't find a specific source to cite for this reaction.

3. H2S → SO2: This reaction represents the oxidation of hydrogen sulfide (H2S) to sulfur dioxide (SO2). Unfortunately, I couldn't find a specific source to cite for this reaction.

4. SO2 → H2SO3: This reaction represents the dissolution of sulfur dioxide (SO2) in water to form sulfurous acid (H2SO3). I couldn't find a specific source to cite for this reaction.

5. H2SO3 → H2SO4: This reaction represents the oxidation of sulfurous acid (H2SO3) to sulfuric acid (H2SO4). I couldn't find a specific source to cite for this reaction.

6. H2SO4 → Na2SO4: This reaction represents the neutralization of sulfuric acid (H2SO4) with sodium hydroxide (NaOH) to form sodium sulfate (Na2SO4). Unfortunately, I couldn't find a specific source to cite for this reaction.

7. Na2SO4 → BaSO4: This reaction represents the precipitation of barium sulfate (BaSO4) from a solution containing sodium sulfate (Na2SO4) and barium chloride (BaCl2). The reaction can be represented as follows: BaCl2 + Na2SO4 → BaSO4 + 2 NaCl.

8. BaSO4: Barium sulfate (BaSO4) is a white crystalline solid that is insoluble in water. It is often used as a contrast agent in medical imaging procedures like X-rays.

Please note that while I couldn't find specific sources for each individual reaction, the information provided is based on general knowledge of chemistry and chemical reactions.