+ 2e− H2 (g) + 2OH− (aq) Dilute NaCl: Half-equations: 2H2O (l) O2 (g) + 4H+ (aq) + 4e− 2H2O (l) + 2e− H2 (g) + 2OH− (aq) Overall reaction: 2H2O (l) 2H2 (g) + O2 (g) Production of SODIUM HYDROXIDE: Mercury Cell: Electrolytic half-equations: ANODE (titanium): 2Cl− (aq) Cl2 (g) + 2e− CATHODE (mercury) : Na+ (aq) + e− Na (Hg) Hydrolysis of sodium: sodium + water sodium hydroxide + hydrogen 2Na (s) + 2H2O (l) 2NaOH (aq) + H2 (g)
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GREAT DISCOVERIES CHANGE LIVES Do you like watching television? I love it. I do not know what would I do if televisions did not exist. It is interesting‚ in several years‚ they have become a huge part of our lives‚ our indispensables. J.J. Thomson was inspired by some scientists and he provided us the opportunity of having televisions in our lives. Also other scientists improved his thoughts and experiments which leaded to the invention of the television afterwards. It is not that simple of course
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high quality sodium hydroxide is the membrane cell process. This uses a steel cathode with a Nafion membrane‚ a synthetic material made of polymers with ionic properties‚ to separate the cathode and anode reactions. The sodium hydroxide builds up at the cathode and the chlorine builds up at the anode. To use drain cleaner is a very straightforward process. In the case of Drano Crystal Clog Remover you simply pour the dry crystals down the drain and let some cold water run down it. Although it
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Etymology of the Word Thyristor A thyristor is a solid-state semiconductor device with four layers of alternating N and P-type material. The thyristor or Silicon Controlled Rectifier (SCR) was proposed by William Shockley in 1950 and supported by Bell Laboratories‚ formerly known as AT&T Bell Laboratories. It was developed in 1956 by power engineers at General Electric (G.E.) led by Gordon Hall and commercialized by G.E. ’s Frank W. "Bill" Gutzwiller (1). There are various types of thyristors;
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Contents 1. What is OLED? 2. History of OLED 3. Construction 4. Working Principle 5. Meterial Technologies 6. Device Architectures 7. Advantages 8. Disadvantages 9. Manufacturers and commercial uses 10. References What is OLED Led: A light-emitting diode (LED) is a semiconductor light source. When a light-emitting diode is forward biased (switched on)‚ electrons are able to recombine with electron holes within the device‚ releasing energy in the form of photons. This effect is called electroluminescence and
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|Fig.2. Diode voltage-current curve‚ U-I curve. | In Fig. 2 there is U-I (voltage-current) curve (characteristic). The diode arrow‚ anode terminal‚ shows the direction of forward current flow. If the diode is in a circuit in which a current of 10mA=10*10-3A is flowing from anode to cathode‚ then the anode is approximately 0.5 volt more positive than cathode. We call it the forward voltage drop. The reverse current is measured in nanoampers and 1nA=1*10-9A. It is so
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SULIT 1 4541/1 Peraturan Permarkahan CHEMISTRY 4541 Kertas 1 Ogos 2011 BAHAGIAN PENGURUSAN SEKOLAH BERASRAMA PENUH DAN SEKOLAH KECEMERLANGAN KEMENTERIAN PELAJARAN MALAYSIA PERATURAN PERMARKAHAN PEPERIKSAAN PERCUBAAN SIJIL PELAJARAN MALAYSIA 2011 CHEMISTRY TRIAL 2011 MARKING SCHEME PAPER 1 4541 /1 © Trial2011 Hak Cipta Sekolah Berasrama Penuh http://cikguadura.wordpress.com SULIT SULIT 2 SKEMA KERTAS 1 CHEMISTRY 4541/1 4541/1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
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DNA DIGESTION AND ELECTROPHORESIS In this experiment we will be doing a process called as DNA digestion or also known as restriction digest. A restriction digest is a procedure used in molecular biology to prepare DNA for analysis or other processing. It is sometimes termed DNA fragmentation‚ scientists Hartl and Jones describe it this way: This enzymatic technique can be used for cleaving DNA molecules at specific sites‚ ensuring that all DNA fragments that contain a particular sequence have the
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Determining Standard Reduction Potentials‚ Equilibrium Constants and Investigating a Lead-Acid Electrolytic Cell Purpose Experimental Methods All procedures were followed according to the lab manual (experiment 10 – Electrochemistry Laboratory). Data and Observations Part A: Grams of FeSO4 used: 0.759 Voltage during voltmeter and battery check: 9.23V Table 1. Electrochemical Cells Data Part B: Table 2. Lead-Acid Battery Results and Calculations In order to make
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Ballast Tank Corrosion Control V Thapar Asst. Director Naval Architecture Naval Headquarters‚ New Delhi 1.0 Introduction : Steel‚ the most corrodible of all ship construction material‚ still remains the most economic choice of ship construction materials however‚ the very nature of steel‚ compounded by the salt laden marine ambience‚ makes the corrosion protection effort arduous. The marine environment is one of the harshest environments any structure could be subjected to. It is
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