It is the smallest and simplest molecule to exhibit enantiomerism. The approximately 100° dihedral angle between the two O–H bonds makes the molecule chiral. For comparison, the rotational barrier for ethane is 1040 cm −1 (12.4 kJ/mol). These barriers are proposed to be due to repulsion between the lone pairs of the adjacent oxygen atoms and dipolar effects between the two O–H bonds. Although the O−O bond is a single bond, the molecule has a relatively high rotational barrier of 386 cm −1 (4.62 kJ/ mol) for rotation between enantiomers via the trans configuration, and 2460 cm −1 (29.4 kJ/mol) via the cis configuration. Hydrogen peroxide ( H 2O 2) is a nonplanar molecule with (twisted) C 2 symmetry this was first shown by Paul-Antoine Giguère in 1950 using infrared spectroscopy. Structure and dimensions of H 2O 2 in the solid (crystalline) phase It may be safely distilled at lower temperatures under reduced pressure. ![]() In practice, hydrogen peroxide will undergo potentially explosive thermal decomposition if heated to this temperature. The boiling point of H 2O 2 has been extrapolated as being 150.2 ☌ (302.4 ☏), approximately 50 ☌ (90 ☏) higher than water. Enzymes that use or decompose hydrogen peroxide are classified as peroxidases. Hydrogen peroxide is found in biological systems including the human body. It is typically stored with a stabilizer in a weakly acidic solution in an opaque bottle. It decomposes slowly into water and elemental oxygen when exposed to light, and rapidly in the presence of organic or reactive compounds. ![]() Hydrogen peroxide is a reactive oxygen species and the simplest peroxide, a compound having an oxygen–oxygen single bond. Concentrated hydrogen peroxide, or " high-test peroxide", decomposes explosively when heated and has been used both as a monopropellant and an oxidizer in rocketry. It is used as an oxidizer, bleaching agent, and antiseptic, usually as a dilute solution (3%–6% by weight) in water for consumer use, and in higher concentrations for industrial use. In its pure form, it is a very pale blue liquid that is slightly more viscous than water. Hydrogen peroxide is a chemical compound with the formula H 2 O 2.
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