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5,500,000 km 2 (2,100,000 sq mi) The Amazon rainforest, [a] also called Amazon jungle or Amazonia, is a moist broadleaf tropical rainforest in the Amazon biome that covers most of the Amazon basin of South America. This basin encompasses 7,000,000 km 2 (2,700,000 sq mi), [2] of which 5,500,000 km 2 (2,100,000 sq mi) are covered by the rainforest.
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 ...
Physical properties. Pure sodium hydroxide is a colorless crystalline solid that melts at 318 °C (604 °F) without decomposition and boils at 1,388 °C (2,530 °F). It is highly soluble in water, with a lower solubility in polar solvents such as ethanol and methanol. [14] Sodium hydroxide is insoluble in ether and other non-polar solvents.
50 states and Washington, D.C. This table lists the 333 incorporated places in the United States, excluding the U.S. territories, with a population of at least 100,000 as of July 1, 2022, as estimated by the U.S. Census Bureau. Five states have no cities with populations exceeding 100,000. They are: Delaware, Maine, Vermont, West Virginia, and ...
Denominations; Superunit 10: Eagle: Subunit 1 ⁄ 10 Dime 1 ⁄ 100 Cent 1 ⁄ 1000 Mill: Symbol Cent Mill Banknotes Freq. used: $1, $5, $10, $20, $50, $100 Rarely used: $2 (still printed); $500, $1,000, $5,000, $10,000 (discontinued, but still legal tender); $100,000 (discontinued, not legal tender, and only used for specific purposes)
Monty Hall problem. In search of a new car, the player chooses a door, say 1. The game host then opens one of the other doors, say 3, to reveal a goat and offers to let the player switch from door 1 to door 2. The Monty Hall problem is a brain teaser, in the form of a probability puzzle, based nominally on the American television game show Let ...
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