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Hace 3 días · Silicon dioxide, also known as silica, is an oxide of silicon with the chemical formula SiO2, commonly found in nature as quartz. [5] [6] In many parts of the world, silica is the major constituent of sand. Silica is abundant as it comprises several minerals and synthetic products.
Hace 1 día · Methane is a tetrahedral molecule with four equivalent C–H bonds. Its electronic structure is described by four bonding molecular orbitals (MOs) resulting from the overlap of the valence orbitals on C and H. The lowest-energy MO is the result of the overlap of the 2s orbital on carbon with the in-phase combination of the 1s orbitals on the ...
Hace 11 horas · Germany. / 52.517°N 13.383°E / 52.517; 13.383. Germany, [e] officially the Federal Republic of Germany, [f] is a country in the western region of Central Europe. It is the second-most populous country in Europe after Russia [g] and the most populous member state of the European Union.
Hace 3 días · Since confederation in 1867 through to the contemporary era, decadal and demi-decadal census reports in Canada have compiled detailed immigration statistics. . During this period, the highest annual immigration rate in Canada occurred in 1913, when 400,900 new immigrants accounted for 5.3 percent of the total population, while the greatest number of immigrants admitted to Canada in single year ...
Hace 2 días · White Americans (also referred to as European Americans) are Americans who identify as white people. This group constitutes the majority of the people in the United States. According to the 2020 census, 71%, or 235,411,507 people, were White alone or in combination, and 61.6%, or 204,277,273 people, were White alone.
Hace 2 días · A key mathematical property of the Pearson correlation coefficient is that it is invariant under separate changes in location and scale in the two variables. That is, we may transform X to a + bX and transform Y to c + dY, where a, b, c, and d are constants with b, d > 0, without changing the correlation coefficient.
Hace 1 día · Russian Civil War. The Russian Civil War [a] was a multi-party civil war in the former Russian Empire sparked by the overthrowing of the social-democratic Russian Provisional Government in the October Revolution, as many factions vied to determine Russia's political future. It resulted in the formation of the Russian Socialist Federative Soviet ...
