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
請問用10’s complement 7523-4.567如何計算🙏
-801. complement form and perform the following operations (note that the sum is +10,627 and requires five digits and a sign). (a) (+9,286) + (+801) (c) (-9,286) + (+801) (b) (+9,286) + (-801) (d) (-9,286) + (-801) signed-2's-complement Termissh. Di sdi 101 1.20 Convert decimal +49 and +29 to binary, using the representation and enough digits to accommodate the numbers. Then perform the binary equivalent of (+29) + (−49), (−29) + (+49), and (−29) + (−49). Convert the answers back to deci- mal and verify that they are correct. 1.21) If the numbers (+9,742)10 and (+641)10 are in signed-magnitude format, their sum is (+10,383)10 and requires five digits and a sign. Convert the numbers to signed-10's- complement form and find the following sums: (a) (+9,742) + (+641) (c) (−9,742) + (+641) (b) (+9,742) + (-641) (d) (−9,742) + (−641) 1.22 Convert decimal 9,045 and 337 to both BCD and ASCII codes. For ASCII, an even parity bit is to be appended at the left. (1.23) Represent the unsigned decimal numbers 609 and 516 in BCD, and then show the steps necessary to form their sum.
Chan 1.18 Problems Perform subtraction on the given unsigned binary numbers using the 2's complement of the subtrahend. If the result of subtraction is negative, its decimal equivalent is formed by taking the 2s complement of the result and including a minus sign.SE.F (a) 11001 10010 bra (b) 1100 - 111100 (d) 1100011 (c) 10101 - 11011 10001 55 grow rorrorOFFIC 1.19* The following decimal numbers are shown in signed-magnitude form: +9,286 and +801. Convert them to signed-10's-complement form and perform the following operations (note that the sum is +10,627 and requires five digits and a sign). (a) (+9,286) + (+801) id (b) (+9,286) + (−801) (d) (-9,286) + (−801)
The message "Pass 0.12" is to be sent via communication line. For this, each character of the message should be encoded into a seven-bit ASCII code including the period and the it. Write the expression for the message sent. space. Each ASCII encoded character should be then encrypted by adding binary 101 to 1.29* Decode the following ASCII code: 10000110101110 1000010 1000001 1000010 1000010 1000010 1000111 1000101. 1.30 The following is a string of ASCII characters whose bit patterns have been converted into hexadecimal for compactness: 47 2E 5C 42 CF CF CC C5. Of the eight bits in each pair of digits, the leftmost is a parity bit. The remaining bits are the ASCII code. (a) Convert the string to bit form and decode the ASCII. (b) Determine the parity used: odd or even?
請問17 然後 小數的1、2補數跟9、10補數如何計算呢thx!
TUTTI (e) 11000011 1.15 Find the 9's and the 10's complement of the following decimal (a) 65,234,035 (c) 87,000,367 1.16 (a) Find the 8's complement of (2360). (b) Convert (2360), to binary. (b) 56,783,223 (d) 99,999,000 (c) Find the 2's complement of the result in (b). Minib mol (d) Convert the answer in (c) to octal and compare with the answer in (a). 1.17 Perform subtraction on the given unsigned numbers using the 10's complement of the subtrahend. Where the result should be negative, find its 10's complement and affix a minus sign. Verify your answers. (a) 7,523-4.567 (c) 224-712 raison (b) 230 - 1,204 (d) 2,390 - 945
1. " 本程式目的是宣告兩個變數a與b後再相加與相減,並利用print不換行送出結果到螢幕,如 下圖: E a=3.5 b=1.5- print(_ print( ← a+b=5a-b=2 , a+b, [31 , a-b) 2. """ 本程式目的是讓使用者任意輸入三個數字,並用逗號分開,之後再計算這三個數子的總和 與平均送出到螢幕。 HAVEL num1, num2, num3.  total = num1 + num2 + num3 average = total / 3< print(total, average) str="one,two,three" print(   radius = - - J 3. '''''' 本程式目的是宣告一個字串變數"one,two,three"後,只選出one送出到螢幕。 !!!!!!  4. " 出到螢幕 本程式目的是讓使用者任意輸入圓形半徑後,計算圓形面積並送出到螢幕,其中圓周率採 用pythone 的函數庫指令 WATL  C  areaCircle = radius * radius print(areaCircle)<  ('Enter three numbers separated by commas: '))<  _('請輸入半徑:'))' #計算圓形面積