WLPHSHULRG ‚ u9 u W I 7 S u 9 SRZHU ZRUNGRQH WLPHWDNHQ 3 : W SRZHU HQHUJ\WUDQVIHUUHG WLPHWDNHQ 3 : W v 2uS ur T orbital speed 2S uorbital radius WLPHperiod :KHUHQHFHVVDU\DVVXPHWKHDFFHOHUDWLRQRIIUHHIDOOJ PV 2 *P40138A0232* BLANK PAGE *P40138A0332* 3 Turn over Answer ALL questions. 1 (a) The diagram shows some electrical circuit symbols. A B C D (i) Which symbol represents a switch? (1) A B C D (ii) Which symbol represents a diode? (1)
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Name: Chen Yao Le Lab Group: Tues Email: A0111185@nus.edu.sg Matriculation Number: A0111185R Date of Experiment: 17 February 2015 Experiment 6: Synthesis‚ Electronic Spectra‚ Structural Isomerism: Octahedral Co(III) complexes with Chloride and Ethylenediamine Ligands Abstract: In this experiment‚ Δ/Λ-[Co(en)3]Cl3∙4H2O was synthesized and the absorbance in UV-vis spectrum was recorded
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Chem. 6C Midterm 1 Version A October 19‚ 2007 Name__________________________________________ Student Number _________________________________ All work must be shown on the exam for partial credit. Points will be taken off for incorrect or no units. Non graphing calculators and one hand written 3” × 5” note card are allowed. Problem 1 (of 15 possible) Problem 2 (of 26 possible) Problem 3 (of 20 possible) Problem 4 (of 15 possible) Problem 5 (of 6 possible) Problem 6
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CHEM 101 – General Chemistry I Chapter 2 Reading Assignment Pages 31 - 60 2.1 – What is Matter Made Of? Who 1st discovered atoms – Democritus where the first person to discover atoms. His followers would often think that there were multiple kinds of atoms and not just plain atoms. 2.2 – How Do We Classify Matter? Elements – A substance that consists of identical atoms. Today there are 116 known elements. Example – C= Carbon; H= Hydrogen Compounds – A pure substance made up of two or more elements
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Materials 1 spectroscope 1 incandescent bulb 1 hydrogen gas discharge tube 1 mercury discharge tube 1 nitrogen gas discharge tube 1 fluorescent light 1 neon gas discharge tube Solar light source 1 discharge tube apparatus Procedure The procedure of using a spectroscope was practiced with a fluorescent light source. The slit was pointed towards the source‚ and the spectroscope was shifted until the spectrum was clearly visible. The appearance of the spectrum from the fluorescent light
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(g) [2] HKA3 = + Q kJ Reverse equation [1]2NaCl(aq) + H2O(l) + CO2 (g) → Na2CO3(s) + 2 HCl (aq) HKA2 = + P kJ / mol2 NaHCO3 → Na2CO3(s) + H2O +CO2 Hrxn = +P + 2(Q) kJ | Experiment 7 :Procedures -1. Set-up the apparatus as shown in the diagram below | 2. Using sand paper‚ both copper plates were brushed‚ and then dipped into propanone‚ followed by drying both plates using hair drier. | 3. Both plates were then weigh separately and were recorded as initial mass of anode and cathode in the
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Satellite Learning Center‚ n.d.). In total there are a constellation of over 24 GPS satellites orbiting around the earth at an altitude of 20‚000 km from the ground with an orbital speed of about 14‚000 km/h. The satellites are solar-powered and make two revolutions of earth per day (orbital period of 12 hours). Their orbital paths are arranged so that at least four satellites are visible to the GPS receiver at any given point and time on earth to transfer data. The satellites all carry an atomic
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Abstract— In this study‚ using tight binding model a simple analytical approach has been proposed to investigate the energy dispersion of graphene under the conditions of different planner strain distribution. Here the change in the angle between the primitive unit vectors due to application of external strain has been taken into consideration to propose the approach. From our proposed model it is found that graphene under relaxed or symmetrical strain distribution is a zero bandgap semiconductor
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Objective The goal of this experiment is to characterize NaBD4 and NaBH4 using infrared (IR) spectroscopy and melting points. The changes in the spectra due to isotopic labeling are compared to calculated values from the simple harmonic oscillator model. In addition‚ the specific molecular vibration nodes are visualized using computational chemistry software. Introduction The Lewis acid-base is defined simply: acids accept electrons‚ and bases donate electrons. Lewis acids and bases are important
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Reaction mechanism of tert-butylation of phenol with tert-butyl alcohol over H-beta zeolite: An ONIOM study | 作者: Nie‚ XW (Nie‚ Xiaowa)1‚3‚4; Janik‚ MJ (Janik‚ Michael J.)2; Guo‚ XW (Guo‚ Xinwen)1; Liu‚ X (Liu‚ Xin)1; Song‚ CS (Song‚ Chunshan)1‚2‚3‚4 | 来源出版物: CATALYSIS TODAY 卷: 165 期: 1 页: 120-128 DOI: 10.1016/j.cattod.2010.11.070 出版年: MAY 16 2011 | 被引频次: 2 (来自 Web of Science) | 引用的参考文献: 50 [ 查看 Related Records ] 引证关系图 | 摘要: Tert-butylation of phenol with tert-butyl alcohol
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