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.

不好意思可以問一下！這題有沒有會嗎！謝謝🙏

19. 汽車維修花費 汽車維修花費不斷上升,2015 平均維修花費為 $367 (U.S. News & “也是或World Report website)。假定汽車維修花費是常態分配,標準差為 $88。回答以下關 於汽車維修費的問題。 a. 維修花費超過 $450 的機率是多少? b. 維修花費低於 $250 的機率是多少? k c. 維修花費介於$250到$450 的機率是多少? d. 如果你的汽車維修是收費比較低的5%,你必須支出多少錢?

（大一微積分） 請問這題這樣寫正確嗎？背流程寫的😅，圖一為需用到的定義 正確的話，想問紅色圈圈的1是怎麼來的？

DEFINITION Let f be a function defined on some open interval that con- tains the number a, except possibly at a itself. Then we say that the limit of f(x) as x approaches a is L, and we write lim f(x) = L x→a if for every number &> 0 there is a corresponding number 8 >0 such that | ƒ(x) − L| < ɛ if 0 < x-a <8 then

電子學 電晶體偏壓那章的問題 求講解🙏

LIW Self-test. 2 C C BD sim-syual 輸入已施加偏压的必晶体基体,其輸出端正弦波集極零压則在接近 ov sh 被截除,此电晶体處在?駝進入飽和区、工作於非線性区 -2010 Problems.

求解，可以教我怎麼算嗎😭

2 Two individuals, 4.455Cc2D2D5e and qqgppccddee, are mated (配對) to produce anFl that is self-fertilized io Produce F2. Ifthe capitalletters (大寫) represent dominant, and all five loci are independently assorting alleles: 人 1) How many different genotypes will oceur in the F2? 2) What proportion (比例) ofthe F2 genotypes will be recessive for all five loei (基因座)? 語玉2

請問有人會這部分嗎謝謝🙏

the correct order fo Hefinitions- loit and use: 7esgozerees 上 曙 le_(CSEHDLUE) progressing: UUUE ce十_(BDTUGE) iece of work or Project (EAWKTMRO) (LSIKLS) 乙 ances-- 妃 4 S革 和 主人記 gate he always Jets me uld meet fo gefan _(G 二 ortsupPy fo work 也is pressing- rything yourself. ef. UpJe. fform Of words 、 Business co mmunication 1 Complete the conversation with thewords from helist 同計 方 diygJIz lse 5e7r jpZ7TES of擴 goe7e CIO7e7I4D/ 一jgFPsrcheck 4e記 IPpdqfe jie Fefs 7ed YO7Z7E 7C With 說 Right, so everything 5 4 時寢 tion. Whats next on the list? Ah yes, 位 before Iforget Melinda, can you contact the car / % AA hire people for the VIPs? fer notto詮 that's Melinda Td Pre Tm really busy with the caterers' Henry Oh really? Whats 戰記加計 Melinda The usual Problems Wi mlenu changes- which is whyIcant take anything else or Henry, As Melindazs busy, 1w 了at sormmething you can 3 he WWW0-,Martin? Martin Sure, no problem- Henry Thanks, Martim. Martin You'Te welcome. 9 Henry And《uUM&OVo. we with replies to the invitations, Rebecca? W 國說BY Rebecca Tvesent them outbut 5 人 vwaitng forIeplies from 70 people. Henry Thatmany? Can 6 theyTe coming? (le cx Rebecca No,Ican manage- 可ling them individuauy over the next two days. Thanks, Rebecea. OK Ralph. Can you Hen 3 ) hon briefing the media? Ralph 8 so good. Lve sent outapress release and afew journalists have already confirmed- Henry Good,so” 路6 人weall know what weTe doing. Melinda is dealing with the caterers, Rebecca is handling the invitations, Martin is handling the car hire firm and Ralpt has volunteered to deal with the media. OK, 放 that's everything, 10 |@峽againinaweekt review progTess. CC OK.LTddoitbut (多 1 help you check和it

請問有人會第二部分嗎謝謝🙏

3 | Practice file Working with words IT PutftheIetters im brackets in the correctorder to make words thatmatch the definitions. 1 something available to exPploit and use: yesolerces- (ESCRORUSE) Sweulg_(csEHDLUE) 2 ftimetable of activities: 3 news onhow something is progressing: (UTEPAD) 4 money spending plan: bpe (BDTUGE) 5 thelast day for finishing a piece of work or projeetk NWZ/ (ADENDEL 6 working together: 0(EAWKTMRO) 7 practicalabilities:_<erlUe_(LSIKLS) 2 Match 1-8 to a-h to make sentenees7 SO 1 Itsalways difficult to allocate 4 炙訕 2 youneed to learn how to delegate 3 由 about my boss is she always lets me get 4 Were falling 1 5 Isdifficult to stay withim 人 6 HIfwecontinue like this, weshould meet 7 Hi Melinda, is Hanna,Ineed to getan 8 Tm sure we beable to catch 襯- p pehind schedule, so we all need to work tfhis weekend. update on how the project is progressing, ~d_tasks-you cantpossibly do everything yourself, \ 印- there are three more weeks left. f onwith my workonmyowrm 痊 budget-wealways overspend- ”h thedeadline without too much trouble, 3 Complete the email with the correct form OfWords from 2.