Chromatography of Commercial Analgesics Chromatography of Commercial Analgesics CHEMISTRY 200L EXPT 4 PAGE 8 - 11 CHEMISTRY 200L EXPT 4 PAGE 8 - 11 Janna Vernice R. Villalon*‚ Christian V. Villanueva‚ Cyd Vincent L. Zamora Department of Chemistry‚ College of Science *Corresponding author; e-mail: janna.villalon@rocketmail.com Abstract In analyzing the chromatography of analgesics‚ thin layer chromatography (TLC) was used. A very thin (micron) film of silica is coated on a glass
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01:52:00 C) 01:53:10 D) 01:54:20 3. What is the time lag (S-P) in hours:minutes:seconds GMT? (See Lab Exercise 1‚ Step 1‚ Question 3) A) 00:02:00 B) 00:03:20 C) 00:03:30 D) 00:04:10 4. What is the distance in kilometers between the seismic station and the epicenter? (See Lab Exercise #1‚ Step 2‚ Question 4) A) 2400 km B) 2600 km C) 2800 km D) 3000 km 5. What is the time lag for noted at the Seattle‚ Washington‚ seismic station? (See Lab Exercise #2‚ Step 1) A) 45 seconds B) 50 seconds
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Unit 4 test Please answer the following questions. You may use your Periodic table and vocab (65 points) Match the following items. (14 points) 1. emitted from a cathode ray tube Bohr 2. discovered the neutron Chadwick 3. discovered the electron JJ 4. postulated the quantum atom nucleus 5. discovered the proton electrons 6. father of atomic theory Dalton 7. location of most of the mass of the atom Bohr 1. unlike charges attract 2. like charges repel
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Lesson 4 1. By default‚ Windows 7 standard users are permitted to install Plug and Play devices only if their drivers are Digitally Signed. 2. The debilitating condition in which files are stored as clusters scattered all over a disk is called Fragmentation. 3. The file system included in Windows 7 that is specifically designed for use on flash drives is called exFAT32. 4. Technically speaking‚ you create partitions on basic disks and volumes on dynamic disks. 5. In Windows 7‚ the
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Tutorial 4: Estimations 1. A process producing bricks is known to yield output whose weights are normally distributed with a standard deviation of 0.12lb. A random sample of 40 bricks from a day’s output had a mean weight of 4.07lb. (i) Find a 99% confidence interval for the mean weight of all bricks produced on that day. (ii) Estimate the smallest sample size required if the error in estimating the population mean weight of all bricks is to be within 0.03lb with 95% confidence.
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Assignment-4 (Chs. 10‚ 12 and 13 : these chapters are marked different in the 7th ed. Chs 12 and 13 of the 6th ed are marked as Chs 13 and 14 in the 7th ed) Due by Midnight of Sunday‚ June 29th‚ 2014 (Dropbox 4): Total 125 points True/False (two points each) Chapter10 1. In an experiment involving matched pairs‚ a sample of 15 pairs of observations is collected. The degree of freedom for the t statistic is 14. true 2. In testing the difference between two means from two independent populations‚
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analysis. c. Cross-sectional analysis. d. Ratio analysis. Items 40 and 41 are based on the following information: The Dawson Corporation projects the following for the year 2009: Earnings before interest and taxes Interest expense Preferred stock dividends Common stock dividend payout ratio Common shares outstanding Effective corporate income tax rate $35 million 5 million 4 million 30% 2 million 40% **40. The expected common stock dividend per share for Dawson Corporation for 2009 is a. $2.34 b. $2.70
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9063 Then c=264.3 4. The diagram below shows three islands in Florida Bay. You rent a boat and plan to visit each of these remote islands. If you are on island B‚ on what bearing should you navigate to go to island C? B^2=a^2+c^2-2ac Cos B 25=49+36-2(7) (6) cos B 25=85-84 cos B Cos [B= 60/84=0.714 then B=44.4〗 The bearing angle=90-44.4=45.6 NW 5. Use Heron’s formula to find the area of the triangle. Round off to the nearest square feet. a = 5 feet‚ b = 5 feet‚ c = 4 feet. Area=√(s(s-a) (s-b)
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Seminar 4 - Exercises #1. How many cells can be in a computer’s main memory if each cell’s address can be represented by two hexadecimal digits? What if four hexadecimal digits are used? Explain your answer. Answer: Hexadecimal digits is a base 16 number system and it ranges between 0 and F i.e. 0 - 9 and A - F (10 -15). (Table 1 below shows binary‚ decimal and hexadecimal representation). Two hexadecimal digits will be between 00 and FF and this will make up to 256 cells i.e. 0 – 255 (16
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professionals. 2. (4 points) What is profession‚ and who is a professional? Profession is the term that attributes to professional practices. Profession is an occupational field. Whereas professional is a person who is out there to make money on his or her expertise on a particular knowledge. 3. (2 point) Who is a computer/IT professional? A computer professional is a person who working in a computer related field like information technology field or communications field. 4. (4 points) What are professional
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