What is H2O? Important knowledge about H2O.

1. Definition of H₂O:

1.1 Names:
1.1.1 Common name: Water.
1.1.2 English name: Water.
1.2 Atomic composition: H₂O consists of 2 Hydrogen atoms and 1 Oxygen atom.
1.3 Atomic mass: The mass of H₂O is 18 atomic units.
1.3.1 Molecular structure: The H₂O molecule consists of 2 Hydrogen atoms and 1 Oxygen atom.
1.4 Ion formation: H₂O does not form ions.

2. Properties of H₂O:

2.1 Physical properties of H₂O:

• State: Liquid at standard conditions.
• Color: Colorless.
• Odor: Odorless.
• PH level: 7 (at 25°C).
  2.2 Chemical properties of H₂O: Stable, not flammable, does not react with oxygen, hydrogen gas, does not react with metals under normal conditions. Water can react with metals, non-metals, salts, acids, bases.

3. Common chemical equations involving H₂O:
   • Metal reaction: 2Na + 2H₂O -> 2NaOH + H₂.
   • Acidic Oxide reaction: SO₃ + H₂O -> H₂SO₄
   • Non-metal reaction: H₂O + Cl₂ -> HCl + HClO
   • Reaction with salts: Does not participate in reactions
4. Synthesis of H₂O:
   4.1 Laboratory synthesis of H₂O:
• 2H₂ + O₂ -> 2H₂O.
  4.2 Industrial synthesis of H₂O:
• H₂ + 1/2O₂ -> H₂O.
  These are basic knowledge about H₂O – an essential chemical substance in our daily life.