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.
The first area to use national park in its creation legislation was the US's Mackinac Island, in 1875. Australia's Royal National Park, established in 1879, was the world's third official national park.In 1895 ownership of Mackinac Island was transferred to the State of Michigan as a state park and national park status was consequently lost.lthough Yellowstone was not officially termed a national park in its establishing law, it was always termed such in practice and is widely held to be the first and oldest national park in the world.