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自然科學 大學

為什麼[A(org)]=n[An(org)]成立 (第三張圖equation 7.9) 感謝

Experiment 7 Experiment 7 The partition of Organic acid between Water and Organic solvent Objectives Understand the partition of a solute between two immiscible solvents. Introduction A chemical analysis that is performed primarily with the aid of volumetric glassware (e.g., pipets, burets, volumetric flasks) is called a volumetric analysis. For a volumetric analysis procedure, a known quantity or a carefully measured amount of one substance reacts with a to-be-determined amount of another substance with the reaction occurring in aqueous solution. The volumes of all solutions are carefully measured with volumetric glassware. The known amount of the substance for an analysis is generally measured and available in two ways: 1. As a primary standard: An accurate mass (and thus, moles) of a solid substance is measured on a balance, dissolved in water, and then reacted with the substance being analyzed. 2. As a standard solution: A measured number of moles of substance is present in a measured volume of solution - a solution of known concentration, generally expressed as the molar concentration (or molarity) of the substance. A measured volume of the standard solution then reacts with the substance being analyzed. The reaction of the known substance with the substance to be analyzed, occurring in aqueous solution, is generally conducted by a titration procedure. The titration procedure required a buret to dispense a liquid, called the titrant, into a flask containing the analyte. A reaction is complete when stoichiometric amounts of the reacting substances are combined. In a titration this is the stoichiometric point. In this experiment the stoichiometric point for the acid-base titration is detected using a phenolphthalein indicator. Phenolphthalein is colorless in an acidic solution but pink in a basic solution. The point in the titration at which the phenolphthalein changes color is called the endpoint of the indicator. Indicators are selected so that the stoichiometric point in the titration coincides (at approximately the same pH) with the endpoint of the indicator.

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公民與社會 高中

請問為什麼D不對

據外媒報導,馬來西亞於2022年11月19日舉行國會大選,國內主要政黨聯盟中, 在野聯盟領袖安華(Anwar Ibrahim)為首的「希望聯盟」(Hope Pact)拿下82席,前線 慕尤丁(Muhyiddin Yassin)所帶領的「國民聯盟」(Perikatan Nasional)則緊追在後, 73席;而執政的「國民陣線」(Barisan Nasional)只拿下30席,雖然僅有30席,但預計 能透過選擇支持哪一個陣營來扮演重要角色。 案 W 馬來西亞下議院有222個席次,媒體報導指出,這是馬國首次出現「懸峙國會」(hun parliament)局面。獲得多數席次的希望聯盟、國民聯盟勢必得和其他政黨或聯盟合作, 能取得籌組政府所需的席次。儘管「希望聯盟」奪下最多的國會席次,但有新加坡媒體認為 「希望聯盟」與其他政黨聯盟之間存有意識形態差異,很難找到潛在的執政聯盟夥伴,因此 較難取得足夠的國會議員支持籌組政府,其他政黨團體比較可能願意與「國民聯盟」攜手合 “联合內閣之成員是由來自不同政黨的黨員所組成,因此閣員背belong的party可能 作。 有不同的政見,利益考量,易使政策制定和施政方針变Complex,故(5) 苦思刻开 平鎮高中 ) 41.目前馬來西亞國會未有政黨聯盟獲得足以組成政府的議員席次,因此需要與其他 政黨聯盟合作,共同組閣,但是共同組閣的情形下,較容易出現下列何種狀況? (B) (A)元首權力過度擴張 味麵 (C) 國會易濫用否決權 (B)施政責任不易釐清 (D)內閣任期不固定

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