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Hydrochloric acid has been used for dissolving calcium carbonate, e.g. such things as de-scaling kettles and for cleaning mortar off brickwork. When used on brickwork the reaction with the mortar only continues until the acid has all been converted, producing calcium chloride, carbon dioxide, and water: CaCO 3 + 2 HCl → CaCl 2 + CO 2 + H 2 O
[9]: 37 Power was restored to unit 1 (and 2) using a mobile generator at 15:30 on 12 March. [9]: 37 [46] At 15:36, a hydrogen explosion damaged the secondary confinement structure (the RB). The cause was unknown to the workers at the time, most of whom evacuated shortly after the explosion.
U.S. GDP was approximately $15 trillion during 2011 and an estimated $15.6 trillion for 2012 based on activity during the first two quarters. [59] This means the total debt is roughly the size of GDP. Economists debate the level of debt relative to GDP that signals a "red line" or dangerous level, or if any such level exists. [60]
The largest one-day percentage gain in the index happened in the depths of the 1930s bear market on March 15, 1933, when the Dow gained 15.34% to close at 62.10. However, as a whole throughout the Great Depression, the Dow posted some of its worst performances, for a negative return during most of the 1930s for new and old stock market investors.
By 2013, The Shawshank Redemption had aired on 15 basic cable networks, and in that year occupied 151 hours of airtime, rivaling Scarface (1983), and behind only Mrs. Doubtfire (1993). It was in the top 15% of movies among adults between the ages of 18 and 49 on the Spike, Up, Sundance TV, and Lifetime channels.
The hypothesis of dark matter has an elaborate history. [18] [19] In the appendices of the book Baltimore lectures on molecular dynamics and the wave theory of light where the main text was based on a series of lectures given in 1884, [18] Lord Kelvin discussed the potential number of stars around the Sun from the observed velocity dispersion of the stars near the Sun, assuming that the Sun ...
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