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In chemistry and materials science, impurities are chemical substances inside a confined amount of liquid, gas, or solid. They differ from the chemical composition of the material or compound. [ 1 ] Firstly, a pure chemical should appear in at least one chemical phase and can also be characterized by its phase diagram .
For higher melting point metals and alloys such as steel and silver, oxidized impurities melt and float making them easy to pour off. With wrought iron, hammering and later rolling remove some dross. [1] With tin and lead the dross can be removed by adding sodium hydroxide pellets, which dissolve the oxides and form a slag. If floating, dross ...
For a plain puzzle, the clue-word is indicated by a simple definition. If the competition puzzle is a special, finding the clue-word may be part of the puzzle and frequently the submitted clue has to conform to the puzzle's particular conventions. [6] Azed Prize Bookplate (Reg Boulton design) The competition results are announced three weeks later.
Cryptic crosswords often use abbreviations to clue individual letters or short fragments of the overall solution. These include: Any conventional abbreviations found in a standard dictionary, such as: "current": AC (for "alternating current"); less commonly, DC (for "direct current"); or even I (the symbol used in physics and electronics)
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A crossword (or crossword puzzle) is a word game consisting of a grid of black and white squares, into which solvers enter words or phrases ("entries") crossing each other horizontally ("across") and vertically ("down") according to a set of clues. Each white square is typically filled with one letter, while the black squares are used to ...
A Florida man is accused of beating another man to death with golf clubs on a course in Palm Beach County. A probable cause affidavit filed by the Palm Beach Gardens Police Department obtained by ...
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