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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 An acid-base adduct with triphenylphosphine oxide is a useful 'carrier' for H 2O 2 in some reactions. Hydrogen peroxide forms stable adducts with urea ( Hydrogen peroxide - urea), sodium carbonate ( sodium percarbonate) and other compounds. 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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