想問3-9的a跟c

Problems 3-1. Explain the difference between *(a) random and systematic error. (b) constant and proportional error. *(c) absolute and relative error. (d) mean and median. *3-2. Suggest two sources of systematic error and two sources of random error in measuring the length of a 3-m table with a 1-m metal rule. 3-3. Name three types of systematic errors. *3-4. Describe at least three systematic errors that might occur while weighing a solid on an analytical balance. *3-5. Describe at least three ways in which a systematic error might occur while using a pipet to transfer a known volume of liquid. 3-6. Describe how systematic method errors may be detected. *3-7. What kind of systematic errors are detected by varying the sample size? 3-8. A method of analysis yields masses of gold that are low by 0.4 mg. Calculate the percent relative error caused by this result if the mass of gold in the sample is (a) 500 mg. (b) 250 mg. V(c) 125 mg. (d) 60 mg. 3-9. The method described in Problem 3-8 is to be used for the analysis of ores that assay about 1.2% gold. What minimum sample mass should be taken if the relative érror resulting from a 0.4-mg loss is not to exceed *(a) -0.1%? (b) -0.4%? (c) -0.8%? (d) - 1.1%? 3-10. The color change of a chemical indicator requires an overtitration of 0.03 mL. Calculate the error if the total volume of titrant is percent relative (a) 50.00 mL. (c) 25.0 mL. 3-11. A loss of 0.4 mg of Zn occurs in the course of an percent relative analysis for that element. Calculate the error due to this loss if the mass of Zn in the sample is *(b) 10.0 mL. (d) 30.0 mL. 190 (c) 188 (d) 4.52 x 103 4.63 x 103 4.53 x 10 ³ √6 *(a) 30 mg. (b) 100 mg. *(c) 300 mg. (d) 500 mg. 3-12. Find the mean and median of each of the following sets of data. Determine the deviation from the mean for each data point within the sets, and find the mean devi- Vation for each set. Use a spreadsheet if it is convenient. *(a) 0.0110 0.0105 (b) 24.53 0.0104 24.68 24.81 24.77 39.61 862 (f) 850 MA 3-13. Challenge Problem: Richards and W the molar mass of lithium and colle data. 24.73 Experiment 1 2 3 4 5 6 194 447 X 10 7 448 X 107 4.58 X 10 (a) Find the mean molar t workers. (b) Find the median molar ma (c) Assuming that the cam molar mass of lithium is the absolute ertor and of the mean value demi Willard. (d) Find in the chemical ues for the molar mus since 1910, and ag a table or spreadshera 1817 given in the a Richards and Willd. Com mass versus year to la of lithium has chang Suggest possible abruptly about 18 ant de (e) The incredibly deals Richards and W that major changes will occur. Disc calculation in pat (f) What factors ha since 1910? (g) How would you mass? 6See Chapter 2 of Applications of Microsoft Excel in Analytical Chemistry, 4th ed., for information about statistical 7T. W. Richards and H. H. Willard, J. Am. Chem. Soc., 1910, 32, 4, DOI: 10.1021/ja01919a002. built-in statistical functions. "Answers are provided at the end of the book for questions and problems marked with an asterisk The I of ₂ or inc rce of able vas error c often in individu ate resul data in rtainties. dimensio andom e analysts The result

形容詞子句 請問關係副詞後的子句要為完整子句，請問這一句為什麼符合呢？（因為我覺得它後面的子句感覺不是完整的 謝謝🙏

1. The factory was burned down. I used to work in it (= the factory). The factory which I used to work in was burned down. → The factory in which I used to work was burned down. → The factory where I used to work was burned down. (我之前上班的那間工廠被大火燒光光了。)

求救🆘教教我到底怎麼算！😢😢謝謝你們🙏🏻

1 (21) f(x) = -1 x 1' g(x) = 1 X 2 22-25 Find the functions (a) fo g, (b) gof, (c) fof, and (d) go g and their domains. 22. f(x) = x³ + 5, g(x) = √√x to doang bri batelor 1 23. f(x) = √x" 25, f(x)=√√√5 - x, g(x)=√x - 10 g(x) = x + 1 y lo dostg 2 zi wOH (s). 24. f(x) 24. f(x) = g(x) = sin x T, X diqsty sig od ei woH (d)

1.27要怎麼解是代n=ni 平方/NA?

1.27 For a silicon crystal doped with boron, what must NÅ be if at T = 300 K the electron concentration drops below the intrinsic level by a factor of 10%? Ans. N₁ = 1.5 × 10¹/cm³ 1.9 Current Flow in Semica . 10 58 af bill yd basilma

https://docs.google.com/forms/d/e/1FAIpQLSeBxrL2WyPcAbvF1gI_EWu5a_FkwWOtdcURCSVkOdmJ72-mQw/viewform 這是Google表單，我要做小論文，還請大家幫忙⋯⋯ 最後一題是以自己... 繼續閱讀

想請問這兩題怎麼解？

三、計算題:共6分 1. 如右圖,正方形 ABCD 的邊長 為6,以CD 為直徑作一半圓 AE 切半圓於F點,且交BC 於E點,則: (1) EF 長為何? HE: 6+ (6-x) = (6+X)* 1*X=15 - AF=1.5 (2)△ABF 面積為多少平方單位? 分级机号13元 (3分) (3分) 膠平方单位 VIEW 剛題目都有看清楚嗎?要小心陷阱噢!

想請問畫藍線部分可不可以這樣寫 謝謝🙏🏻

4. 政府當務之急爲檢視教育政策,並為年輕人創造更多就業機會 O It is It is urgent that goverment should check the policy of education education policy and create more jobs font ubung review 8 people.

幫我解答全部題目答案，因為我全部都不會

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可以解釋為什麼不是B嗎

READING & WRITING *** 「黑」科技漫遊 「◎ 重點單字 O為1200字為2000字 o 1. broad [brod ] adj. A The producers hope their show will reach a broad audience. 製作人希望他們的節目能觸及一般大眾。 o 2. housework [`haus, w3k ] n. *:** Do your kids share the housework? 你的孩子會分擔家務嗎? 03. factory [`fæktəri] n. I Jake's whole family works at this factory. 傑克一家都在這間工廠上班。 o 4. bomb [bam] n. 5 Many bombs hit London during World War II. 倫敦在二次世界大戰時遭受許多炸彈攻擊。 5. metal [met]] n. This metal chair is quite heavy. 這把金屬椅子挺重的。 6. basic ['besik] adj. Our basic needs include food, clothing, and shelter. 我們的基本需求包含食物、衣物與遮風避雨的地方。 參考單字 crappy [krep1 ] adj.蹩腳的;糟糕的 robotics [ ro`batiks ]n. situation [sitfu`efon ] n. ◎學習焦點 1. for the most part T 為副詞片語,置於句首時要以逗號隔開後面的句子。 • For the most part, Irene was happy. 在大多數情況下,愛琳是快樂的。 2. make A out of B BA make A from B • Bill made a bag out of/from an old pair of jeans. 比爾用一條舊牛仔褲製作了一個包包。 shi 隨堂測驗・選擇題 Which is true about robots? They don't all behave like people. They never follow any basic rules. They have very few metal parts. They make life less safe for humans. Hebocon: The World's Crappiest Robots 廢柴機器人大賽: 遇見史上最 廢 機4人 Hebocon 是由日文的 heboi 「質感很差的」與英文的 contest [tkanest]「比賽」兩字組合而成,其創辦人石川 大樹說該比賽不是為了要展現高科技,而是要讓人「享受 失敗」。比賽內容非常簡單,採用相撲規術,只要機器人 摔倒或補出場外就算輸。為了防止高科技機器人「攪局」, Hebocon 有一條特別的規則,叫做「高科技懲罰」,如果 科技感太強,就會被扣分! 譯文朗湖》正南 CD/MP3 51 慢速 MP3 93 A CD/MP3 52 When most people think of robots, the ones from the popular movie , Robot come to mind. However, not all robots are machine copies of people. Although many robots look and act like humans, they come in all shapes and sizes. 机器人学 The world of robotics* is quite 理文朗讀》正棠 單字例句》 CD/ Heb broad.' Scientists and engineers build and comes the we develop robots for many situations.* Some robots do P- Hebc The housework. Others put things together in factories. Still, get rid of bombs. For the most part ots help make people's lives easier and safer. toys rob of h 3 People usually make robots out of metal and fancy parts and they put them together with The people at Hebocon don't do any of that, though. In fact, they don't follow 是你的 any basic rules when they make their robots.

為什麼第4題不能選B 求解謝謝

P. (c) Just a thirty-minute train ride from Taipei, you will arrive at Yingge, the pottery center of Taiwan. If you are interested in the history of ceramic making, or want to have a go at making your own pottery, a visit to Yingge should be on your to-do list. Ceramic making in the area dates back nearly two hundred years. The pottery industry was based around Jianshanpu Road, which is the modern day "Old Street." Today, the Old Street is a lively street full of over one hundred stores. Don't forget to come here and pick up a souvenir. While in Yingge, a visit to the Ceramics museum is a must, where you will learn about Taiwanese ceramic making and see beautiful works of artists from around the world. If you love ceramics, the town even has its own festival every October. No trip to Yingge is complete without taking a DIY class. In a DIY class, you take step by step through the process of making and decorating your own masterpiece - anything from a cup, a vase, to a beautiful mosaic picture. You will not be disappointed with a trip to Yingge and if you go on the weekend the busy Old Street will give you a view into both the modern and traditional life of the town. industry 工業;產業 masterpiece 傑作 mosaic (1)( 2) What is the main idea of this passage? (A) The history of the ceramics making. (B) A tour in Yingge the ceramic city. souvenir 紀念品 disappointed 失望的 (C) Different DIY classes in Yingge. (D) Tourists attractions near Taipei. (2) (D) The phrase "have a go at making" in the first paragraph can be replaced by " (A) involving in making (B) finish making (C) have to make (3)( "B (D) try to make Which of the following is NOT mentioned as part of the tour in Yingge? (A) Making your own work of art in a DIY class. (B) Having lunch in the local traditional market. (C) Visiting the Yingge Ceramics Museum. (D) Looking for a souvenir on Old Street. BA According to the passage, which of the following is NOT true? (A) October might be a great time to visit Yingge for ceramics lover. (B) The Old Street only offers visitors a few souvenirs to choose. (C) DIY classes are for children and available on weekends only. (D) Yingge is in the north of Taiwan and not far from Taipei.