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

請問有人會這三題嗎

= 1x 10⁰ p -45. Perform the following unit conversions. meme a. Congratulations! You and your spouse are the proud parents of a new baby, born while you are studying in a country that uses the metric system. The nurse has gibre informed you that the baby weighs 3.91 kg and measures 51.4 cm. Convert your baby's weight to pounds and to ou ounces and her length to inches (rounded to the nearest 3.91 quarter inch). 4536 =8 9.9102 10 20. 2 in, 2b. The circumference of the earth is 25,000 mi at the equa- tor. What is the circumference in kilometers? in meters? 三 c.) A rectangular solid measures 1.0 m by 5.6 cm by 2.1 dm. Express its volume in cubic meters, liters, cubic inches, and cubic feet.

第二小題B錯哪了 我是使用刪去法

易忻资優地科 析 ※閱讀素養專區※ 荷蘭青年柏揚·史拉特(Boyan Slat)在 16 歲的一次潛水時對海洋中滿是垃 圾的景象感到十分震驚,因此他於 2013 年成立海洋清理基金會,立志解決海洋垃 圾危機,他計畫利用海流、風力等要素,讓垃圾自動被攔截而不需要人工處理;史 拉特設計的U型浮柵,下方有三公尺的防護網,可以攔截大部分的海漂垃圾,而海 洋生物也可以輕鬆游過防護網,不會因此受困其中。 史拉特表示,如果這次實測成功,他們會再開發 60 個 U型浮柵,預計五年內 清除太平洋垃圾帶一半垃圾,未來也希望在其他海域布署,期望 2040 年清除全球 90%的海漂垃圾。 【學測地科總複習】 然而在 2018 年 9 月,年僅 24 歲的史拉特經由大量募資而研發出的系统 001 (System001)(俗稱海洋吸塵器)從舊金山出發後經過了幾個月,卻發現成效不彰、 出師未捷,需要不斷調整、維修,甚至在 2019 年1 月系統斷裂,最終宣告失敗。 請回答以下兩題: ( )(1)團隊宣稱在洋流、風和海浪的作用下,系統 001 會比塑膠漂得更快, 然後把塑膠垃圾集中到U字形的圍欄中間。理想情況是風、海浪和洋流全都是往同 另一個方向走,造成失敗無法有效收集垃圾的可能原因以及未來可能遭遇的問題何者 錯誤? (A)海洋的力量難以估計,大浪、狂風暴雨都可能使系統毀損甚至可能讓 系統本身變成一個 600 公尺的超大型海洋垃圾 (B)因為科氏力的影響,風吹的方 向和海水的移動方向並不相同,三公尺深的浮動圍欄和表面的垃圾受到海水的力方 向並不相同 (C)洋流的流動受到很多因素影響而難以準確估計,使系統 001 難以 到達預期的垃圾帶位置 (D)系統 001 漂浮在海中會使生物附著、生長,最終因為 重量太重可能使系統沉沒 (E)為了使系統 001 能追上塑膠碎片漂流的速度,所使 用的化石燃料可能造成更多的損失 国家海 COT R&瑞金 )(2)這個系統希望攔截的垃圾帶位於東太平洋上,面積估計達 160 萬平方公 里,比 44 個臺灣還大,其上漂浮著約 1. 8 兆片塑膠垃圾,重約8萬公噸,垃圾帶 對人類、對環境的影響何者錯誤?(A)塑膠垃圾被分解成小碎片、微粒,經由食 物鏈而進入人體內 (B)覆蓋海面的超大型垃圾帶,可能造成海洋湧升流消失,無 法將營養鹽帶至海水表層 進入海洋的垃圾,除了漂流在表層的塑膠碎片,還 有很大的比例會沉降在海床上,污染深海環境 (DV很多的垃圾含有致癌物質,危 害海洋生物 (海洋環流位置有時會稍微偏移,被聚集在垃圾帶上的部分垃圾可 能脫離環流,被沖上岸重新污染陸地 S423) 解析:(1)(E);(2)(B) 可乾淨 (即安出去) (湖和出生)因总 06ay 因总 G

救我感恩您

Which is not an appropriate pair of analogy between mechanical and electrical quantities of the oscillating systems? (A) x➜ Q; (B) v ←➜1; (C) m← C; (D) F→ V; (E) None.

謝謝～

18~20為題組 在人類發展文明的過程中需要依賴能量,使用時必須依照需要將能量轉換成適當的形式。而在能量的形式 轉換的過程中,總有部分能量會逸散而損失,逸散的能量不易收回再加以利用,因此可供我們利用的「有 用能源」將愈來愈少,找尋新的能源是重要的課題之一。 據估計每年照射在地球表面上的太陽能約為目前全世界每年所需能量的一萬多倍,利用太陽能來發電 應是解決能源匱乏的良好方案。由近年歐盟統計資料(如下左圖)可一窺究竟。 目前人類利用太陽能通常有兩種方式: 一是太陽光照射在某些金屬表面上,使金屬的原子釋放電子,形成電流,轉為電能。最常見的就是太 陽能電池。 另一種方式是大規模的太陽能轉換成我們可使用的能源,然而最大的問題是:太陽並不是隨時都在照 射,以致無法全天候運轉。這問題的解決之道就是在太陽照耀的時候,除了發電裝置運作之外,還要將多 餘的照射能量儲存起來,以待天候不佳或夜晚的時候使用,但是在能量儲存與釋放的過程當中,損失的比 例很大,能量轉換的效率並不高,為各種發電型態中最低的。而近年來對於解決這個問題有了重大的突破 !因為有了熱量貯存媒介的新材料。在西班牙的安達索爾太陽能發電站(Andasol Solar Power Station), 利用直線型拋物面槽式集热器(如下右圖)將入射的陽光經由拋物面板反射,集中能量於拋物面的焦點( 實際上為一直線)處加熱金屬管內的油將水煮沸、產生蒸氣用來發電。實際上,拋物面集热器所收集的熱 能幾乎是白天發電所需熱能的兩倍,多餘的熱則會從管内的油傳送至熱量貯存媒介熔融鹽。其熔點為 240℃,在240℃至590℃的範園內都是很穩定的液態,比熱相當大,是很合適的熱貯存材料、熔融的混合 鹽從 260℃吸取油管的熱能升溫至 400℃。夜間則將熱傳回管內的油,以供發電。如此,發電廠在白天及 夜晚都能運作,既可提升效率又可降低成本,有如打造一個太陽能銀行般將太陽能貯存起來!

謝謝～

18~20為題組 在人類發展文明的過程中需要依賴能量,使用時必須依照需要將能量轉換成適當的形式。而在能量的形式 轉換的過程中,總有部分能量會逸散而損失,逸散的能量不易收回再加以利用,因此可供我們利用的「有 用能源」將愈來愈少,找尋新的能源是重要的課題之一。 據估計每年照射在地球表面上的太陽能約為目前全世界每年所需能量的一萬多倍,利用太陽能來發電 應是解決能源匱乏的良好方案。由近年歐盟統計資料(如下左圖)可一窺究竟。 目前人類利用太陽能通常有兩種方式: 一是太陽光照射在某些金屬表面上,使金屬的原子釋放電子,形成電流,轉為電能。最常見的就是太 陽能電池。 另一種方式是大規模的太陽能轉換成我們可使用的能源,然而最大的問題是:太陽並不是隨時都在照 射,以致無法全天候運轉。這問題的解決之道就是在太陽照耀的時候,除了發電裝置運作之外,還要將多 餘的照射能量儲存起來,以待天候不佳或夜晚的時候使用,但是在能量儲存與釋放的過程當中,損失的比 例很大,能量轉換的效率並不高,為各種發電型態中最低的。而近年來對於解決這個問題有了重大的突破 !因為有了熱量貯存媒介的新材料。在西班牙的安達索爾太陽能發電站(Andasol Solar Power Station), 利用直線型拋物面槽式集热器(如下右圖)將入射的陽光經由拋物面板反射,集中能量於拋物面的焦點( 實際上為一直線)處加熱金屬管內的油將水煮沸、產生蒸氣用來發電。實際上,拋物面集热器所收集的熱 能幾乎是白天發電所需熱能的兩倍,多餘的熱則會從管内的油傳送至熱量貯存媒介熔融鹽。其熔點為 240℃,在240℃至590℃的範園內都是很穩定的液態,比熱相當大,是很合適的熱貯存材料、熔融的混合 鹽從 260℃吸取油管的熱能升溫至 400℃。夜間則將熱傳回管內的油,以供發電。如此,發電廠在白天及 夜晚都能運作,既可提升效率又可降低成本,有如打造一個太陽能銀行般將太陽能貯存起來!

請問第四題如果選D的話合理嗎？覺得蠻通順的 謝謝!

II. 綜合測驗 With all the TED Talks available, how can you choose a good one to start with? TED.com offers several playlists that can introduce you to TED Talks. 1. playlist* features the 25 most-watched talks. Another, 2. "11 must-see TED Talks," aims to give an introduction to the wide range of topics covered. Still another has 3. of the very first talks to be uploaded. 4. , you might start with the one talk that is on all three lists: Sir Ken Robinson's "Do Schools Kill Creativity?" This talk 5. is from 2006, is about encouraging creativity in school. TED's most popular talk, it 6. more than 58 million times over the years. Talks also bed The 563.6 Talk. Eve miss one 1₁. online. T even if y If you still don't know 7. a talk, try TED.com's TED Recommends* system. Using jetoi sii ni sau tot jelewater at slytestil vibaori-pos nseil. some topics you find interesting. 9. with that this is very easy. All you have to do is 8. information, the system recommends a talk for you to watch and rate. After you watch that first 5021 (8) muntari A talk, a second is recommended based on your rating. 10. you watch and rate, the system learns your preferences* and can suggest more and more interesting talks for you. However you choose your first video, TED Talks can be so interesting that it probably won't be your last. 註*: playlist 播放清單;recommend 推薦;preference 偏好 註*:re 1. 6. (B) One coronal THC (C) Another (D) Other ( IV. 篇重 (B)1. ) 1. (A) Some s ohni T (B) known for (C) known as (D) known to (A) S (V) 2. (A) known by Say It (8) do (C) little SURMA) (D) a little st (B) a few B) 3. (A) few ( () 4. (A) In fact commemo (B) In other words (D) However 1 blowodi 10ei (C) Instead blow od si notlesinagio C (C) that (B), which (D), who (^) which bos HO(A) sl odi omr 978l odi Every videos all also launc follow the local focu (B) C in (C) T

1為什麼選C?

2622A (A) IF(B) Since (L') Though U!! MC (2)4 (3B 1410 (518 On the first day of school, we see a lot of students in school buildings. However, 16 7/65

G小題錯在哪⋯

Au equation of state relates the state v (g) True false The internal energy of an animal cell (system) can only be changed by the flow of heat (9) or work (w) across the boundary between the system and surroundings. (4 points). s'open system m True false: Find the incorrect conclusions from the following sentences and correct them. (20 points).

51題，解答九分之一那邊，為何是cot3x的三次方而不是一次方，為何是九分之一不是三分之一？

Finding an Indefinite Integral In Exercises 49–58, find the indefinite integral. Use a computer algebra system to confirm your result. 49. cot 2x dx 50. tan Soor foset X X sec4 4 4 dx 51. csc4 3x dx 52. cores X X cot? csc4 – dx 2 2