For the removal of water from solvents and reagents, see desiccation. In chemistry and the biological sciences, a dehydration reaction is usually defined as a chemical reaction that involves the loss of a water molecule from the reacting molecule. Dehydration reactions are a subset of condensation reactions.ome dehydration reactions can be mechanistically complex, for instance the reaction of a sugar (sucrose) with concentrated sulfuric acid: to form carbon as a graphitic foam involves formation of carbon-carbon bonds.
By Robert McNamara. The First National Park, not only in the United States but anywhere in the world, was Yellowstone, which the US Congress and President Ulysses S. Grant designated in 1872.n the winter of 1871-72 Congress, energized by Hayden's report, which included photographs taken by William Henry Jackson, took up the issue of preserving Yellowstone. And on March 1, 1872, President Ulysses S. Grant signed into law the act declaring the region as the nationâs first National Park.
On March 1, 1872, President Ulysses S. Grant had approved the establishment of Yellowstone National Park âas a public park or pleasuring-ground for the benefit and enjoyment of the people.â1 Yellowstone was the first ânationalâ park.