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Rayon, also called viscose [1] and commercialised in some countries as sabra silk or cactus silk, [2] is a semi-synthetic fiber, [3] made from natural sources of regenerated cellulose, such as wood and related agricultural products. [4] It has the same molecular structure as cellulose.
Hydrogen peroxide ( H2O2) is a nonplanar molecule with (twisted) C 2 symmetry; this was first shown by Paul-Antoine Giguère in 1950 using infrared spectroscopy. [9] [10] 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 ...
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20 $50,000–99,999 56 42 39 $100,000–199,999 41 57 20 Over $200,000 48 48 7 Union households Yes 56 41 20 No 50 49 80 Military service Veterans: 44 54 15 Non-veterans 53 45 85 Issue regarded as most important Racial inequality: 92 7 20 COVID-19 pandemic: 81 16 17 Economy: 16 82 35 Crime and safety: 27 71 11 Health care: 62 37 11 Region East ...
A gray card is a flat object of a neutral-gray color that derives from a flat reflectance spectrum. A typical example is the Kodak R-27 set, which contains one 8 in × 10 in (20 cm × 25 cm) card and one 4 in × 5 in (10 cm × 13 cm) card, each with an 18% reflectance across the visible spectrum, and a white reverse side with a 90% reflectance.