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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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商業與管理 大學

請各位經濟學大大解答謝謝

三) 125美 每件!! 單性還 /天 元漲為 利用下表回答問題8至10。下表為電腦晶片 的需求表: 價格 (美元/片) 需求量 (百萬片/年) 200 250 300 350 400 50 45 40 35 30 MITSUBISHI 問題與應用 83 12. 當小明的所得為3,000美元時,他每個 月買4個麵包與12個甜甜圈。當小明的 所得為5,000美元時,他每個月買8個 麵包與6個甜甜圈。計算小明對麵包與 甜甜圈的需求所得彈性。 13. 下表為手機通話的供給表: 8. a. 當每片的價格由(i)400美元降為350 美元與由(i) 350美元降為300美元 時,總收益會如何變動? b. 在什麼價格下,總收益最大? 9.當平均價格為350美元時,晶片的需求 是有彈性、無彈性還是單位彈性的?用 總收益測試來回答問題。 10.當價格為250美元時,晶片的需求是有 彈性、無彈性還是單位彈性的?用總收 益測試來回答問題。 11.你對香蕉的需求價格彈性為4。當香蕉 的價格上漲5%時, a. 你的香蕉的購買量的變動百分比為 何? b.你對香蕉的支出會如何變動? 價格 (美分/分鐘) 10 20 30 40 供給量 (百萬分鐘/天) 200 400 600 800 a. 計算當價格由每分鐘40美分降為30 美分時的供給彈性。 b. 計算當平均價格為每分鐘20美分時的 供給彈性。 14. 根據關於含糖飲料的新聞中的經濟學, 回答下列問題。 a. 計算水之於含糖飲料價格的需求交叉 彈性。 b. 當含糖飲料被課稅後,總收益會如何 變動?

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商業與管理 大學

想要求解大學初會這一題 練習了很多次 但還是會錯 想請教解題的觀念 因我覺得自己是題目沒有懂

II. The trial balance of Drysdale Company shown below does not balance. DRYSDALE COMPANY Trial Balance June 30, 2025 Errors Correct Debit Credit Debit Credit Cash £2,600 £540 £2,600 Accounts Receivable £7,600 £540 7,600 Supplies 600 Equipment £8,300 + £700 8,300 Accounts Payable £9,766 - £252 -- £225 £9,766 Share Capital-Ordinary 1,952 Dividends £1,500+ £300+ £300 1,500 Service Revenue £15,200+ £279 15,200 Salaries and Wages Expense 3,800 Maintenance and Repairs Expense 1,600 Totals £26,000 £26,918 An examination of the ledger and journal reveals the following errors: 1. Each of the above listed accounts has a normal balance per the general ledger. 2. Cash of £170 received from a customer on account was debited to Cash £710 and credited to Accounts Receivable £710. 3. A dividend of £300 was posted as a credit to Dividends, £300 and credit to Cash £300. 4. A debit of £120 was not posted to Salaries and Wages Expense. 5. The purchase of equipment on account for £700 was recorded as a debit to Maintenance and Repairs Expense and a credit to Accounts Payable for £700. 6. Services were performed on account for a customer, £310, for which Accounts Receivable was debited £310 and Service Revenue was credited £31. 7. A payment on account for £225 was credited to Cash for £225 and credited to Accounts Payable for £252. (@4×10 + 合計1%,41%) 2

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