Question

Na-Na2O-NaOH-Na2SO4-BaSO4

Answer 1

4Na + O2 -> 2Na2O

Na2O + H2O -> 2NaOH

2NaOH + H2SO4 -> Na2SO4 + 2H2O

Na2SO4 + BaCl2 -> BaSO4 + 2NaCl

Answer 2

The given sequence of chemicals appears to be a list of chemical compounds separated by hyphens. Here's a brief description of each compound:

• Na: This chemical symbol stands for sodium, which is a metallic element with atomic number 11.
• Na2O: This is the chemical formula for sodium oxide, which is an ionic compound composed of two sodium cations (Na+) and one oxide anion (O2-).
• NaOH: This is the chemical formula for sodium hydroxide, which is a strong alkaline compound commonly known as caustic soda. It is composed of one sodium cation and one hydroxide anion (OH-).
• Na2SO4: This is the chemical formula for sodium sulfate, which is an ionic compound composed of two sodium cations and one sulfate anion (SO42-).
• BaSO4: This is the chemical formula for barium sulfate, which is a white crystalline solid commonly used as a contrast agent in X-ray imaging.

It's unclear what the context or question is for this list of chemicals, so I hope this information helps.