1. Properties:
Chemical Formula: H₂O₂
Appearance: Clear, colorless liquid (appears pale blue in its pure form due to absorption of light).
Odor: Slightly sharp, similar to ozone.
Density: ~1.45 g/cm³ (pure form).
Solubility: Completely miscible with water.
Boiling Point: ~150.2°C (decomposes before boiling).
pH: Mildly acidic (~4.5-6.5 for diluted solutions).

2. Common Concentrations:
3%: Household disinfectant and wound cleaner.
6% to 10%: Used in hair bleaching and cosmetic products.
30% to 50%: Industrial use in bleaching and water treatment.
90%+: Rocket propellant and specialized applications.

3. Uses:
Medical and Household Applications: Antiseptic for minor cuts and wounds. Mouthwash (diluted form) for oral hygiene. Cleaning agent to remove stains and disinfect surfaces.
Industrial Applications: Bleaching agent for paper, textiles, and wood pulp. Used in wastewater treatment as an oxidizer to break down contaminants.
Cosmetic Applications: Teeth whitening and hair bleaching.
Chemical Manufacturing: Used as an oxidizer in chemical synthesis. Intermediate in producing organic and inorganic compounds.
Rocket Propulsion: High concentrations serve as a monopropellant or oxidizer in rockets.

3. Mechanism of Action:
Hydrogen peroxide decomposes into water (H₂O) and oxygen (O₂) when it comes into contact with light, heat, or catalyzers like enzymes (e.g., catalase in living tissues). The release of oxygen causes its characteristic bubbling when applied to wounds.

4. Safety and Handling:
Toxicity: Can be harmful if ingested, inhaled, or upon skin contact, especially in high concentrations.
Corrosive: Higher concentrations can cause burns or damage to tissues and materials.
Storage: Store in a cool, dark place in opaque, vented containers. Keep away from flammable materials and heat sources.
Spill and Disposal: Rinse spills with large amounts of water. Follow local regulations for disposal.