of air. He considered that this difference had been caused by experimental errors. About 100 years later‚ Lord Rayleigh and Sir William Ramsey discover Argon in 1894. For Ramsey‚ it is was as early as 1885-1890 when he published several notable papers on the oxides of nitrogen and followed those up with the discovery of Argon‚ Helium‚ Neon‚ Krypton‚ and Xenon. Led to the conclusion by different paths and‚ at first‚ without working together‚ both Lord Rayleigh and Sir William Ramsey succeeded in
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NT1110 Computer Structure and Logic STUDENT COPY: Graded Assignments Unit 6 Research Paper 1: Network Attached Storage Learning Objectives and Outcomes This assignment addresses the learning objective “Identify various computer memories and storage devices based on their purposes and functions.” The expected learning outcomes that will result from completing the assignment are: • You will be able to explain what a NAS device is‚ its communication speed‚ capacity‚ and its fault tolerance and management
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CHE 242 Tutorial 3: Problems & Answers Week 4: Feb 2- 6‚ 2009 1. Consider a gas that occupies 1.00 dm3 at a pressure of 2.00 bar. If the gas is compressed isothermally at constant external pressure‚ Pext‚ so that the final volume is 0.500 dm3‚ what is the smallest value Pext can have? Calculate the work involved using this value of Pext. Solution For compression to occur‚ the value of Pext must be at least as large as the final pressure of the gas. P1 = 2.00 bar‚ V1 = 1.00 dm3‚ V2 = 0.500
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metal foils established that a. the mass and positive charge of an atom are concentrated in the nucleus. b. electrons are fundamental particles of all matter c. all electrons have the same charge d. atoms are electrically neutral. __c__ 6. What is the electron configuration for Ar ? a. 1s22s22p63s23p63d2 b. 1s22s22p63s23p64s2 c. 1s22s22p63s23p6 d. 1s22s22p62d83s2 ___a___ 7. In science‚ the correct result for the multiplication 447.0 x 0.340 is a. 152 c
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CM5121 Graduate Organic Chemistry General Administration Matters Dr. Zhang Sheng Office no: S7-03-12 Email: chmzs@nus.edu.sg CM5121 Assessments CA (quiz‚ project) 50% Final Exam (Closed Book) 50% CA: choose 2 out of 3 Quiz 1 (Week 7‚ closed book) 25% Quiz 2 (Week 11‚ closed book) 25% Project Presentation 25% (Week 11-13) 2 Syllabus Broadly divided into 2 parts: 1) Pericyclic Reactions i) Electrocyclic ii) Cycloaddition and cycloreversion iii) Sigmatropic 2) Rearrangements
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CERTIFICATE This is to certify that Ranjeeta Singh of class XI (Science) has completed the chemistry investigatory project entitled The Study of the Acidity of Different Samples of Tea Leaves and the Reasons for the Variation in their Taste as a partial fulfillment of course curriculum under the supervision of Mrs. Mamta Agarwal. This is a bonafide work prepared by herself. Signature of Internal Examiner ACKNOWLEDGEMENT I bonafied CBSE for giving us
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Chemistry 161 Sample Quiz Chapters 1&2 KEY Harold Note: You have already received a significant figures/scientific notation sample quiz. The first ten problems (20 points) will be of exactly the same type. The numbers will be changed to offend the guilty (those who did not use the sample test as a study guide). 1. The term that refers to the reproducibility of a laboratory measurement is a. precision. b. repeatability. c. accuracy. d. exactness. e. the number of S.F. 2. The distance
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Data-based questions Study the photos below and answer the following questions. Photo A Photo B Photo C (a) What are industries shown in photos A‚ B and C respectively? (3 marks) (b) Draw a diagram to illustrate the manufacturing system of the industry shown in photo A. (4 marks) (c) Describe and explain the characteristics of these three industries. (i) Photo A (3 marks) (ii) Photo B (3 marks) (iii) Photo C (in tradition) (3 marks) (d) How do personal factors affect
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constituent elements. Oxygen at te anode‚ hydrogen at the cathode 4. Burning magnesium Place magnesium ribbon in a clean crucible (on a clay triangle above a Bunsen burner). Heat until the magnesium begins to burn. MgO is a white solid. 5. 6. Data and Observations: Complete a data table that includes a prediction of reaction type (single replacement‚ double replacement‚ synthesis‚ decomposition‚ or combustion)‚ observations‚ and identification of reaction type for each reaction in the
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and only one other compound. (4) (Total 6 marks) 2. A compound of carbon‚ hydrogen and nitrogen contains 61.0% of carbon and 15.3% of hydrogen by mass. (i) Calculate the empirical formula of the compound. (ii) What other piece of data is required to deduce the molecular formula from the empirical formula? (iii) If the molecular formula of the compound is the same as the empirical formula‚ draw two possible structures of the compound. (Total 6 marks) 3. (a) Compound A (Mr = 215.8) contains
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