1. (a)Correct the following statements. (i) The melting points of crystalline and amorphous solids are not definite. The melting point of an amorphous solid is not definite. OR The melting point of a crystalline solid is definite. P Ps X solute . Ps P Ps The equation for relative lowering of vapour pressure when solute remains normal is X solute P (iii)The degree of ionization decreases with dilution. The degree of ionisation increases with dilution. (iv) Tertiary butyl halide
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The article “If Hitler asked you to electrode a stranger‚ would you? Probably” by Philip Meyer discusses the Milgram experiment that took place in the 1960’s at Yale University. The experiment was designed to test obedience to authorities of higher power and how they can transform and individual to do things they could never do‚ without being pushed past their moral limits. I do believe that people today still value conformity and obedience to authority as they did in Milgram’s time. When people
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of mould‚ die‚ automotive‚ aerospace and surgical components. In addition‚ EDM does not make direct contact between the electrode and the workpiece eliminating mechanical stresses‚ chatter and vibration problems during machining. 1.2 EDM operation: The principle of EDM is based on the erosion of metals by spark discharge. The basic EDM system consists of shaped tool (electrode) and workpiece connected to a dc power supply and placed in dielectric fluid. When potential difference between tool and
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Electrolysis Electrolysis is the process by which ionic substances are broken down into simpler substances using electricity. During electrolysis‚ metals and gases may form at the electrodes. What is electrolysis? Ionic substances contain charged particles called ions. For example‚ lead bromide contains positively charged lead ions and negatively charged bromide ions. Electrolysis is the process by which ionic substances are decomposed (broken down) into simpler substances when an electric
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being electrolysed has to be an ionic compound. b) The substance being decomposed is called the electrolyte. c) In electrolysis the electric current enters and leaves the electrolyte by conducting rods called electrodes. The positive electrode is called the anode and the negative electrode is called the cathode. d) For electrolysis to occur the electrolyte must be in liquid form so that the ions are free to move. e) In electrolysis the negative ions move towards the anode. When they get there
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potential difference in a voltaic cell Introduction When two electrodes made of different metals are connected together in a voltaic cell‚ the chemical energy present is converted into electrical energy and an electromotive force is generated. This force‚ called the electrode potential‚ is normally measured under standard conditions‚ which is 298K‚ 1 mol dm-3 solution for the electrolyte. However when one measures the electrode potential in a voltaic cell‚ the conditions are often not at standard
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The purpose of this lab was in order to find which combination of two electrodes would produce the greatest voltage‚ under the condition that lemon juice was the electrolyte within a chemical cell. To conduct the lab‚ two slits were created in a lemon‚ which worked as a chemical cell‚ and an assortment of different electrodes were inserted into the lemon. Afterward‚ two wires were attached to each of the electrodes‚ where a voltmeter then gave a reading that was recorded into data. As the experiment
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ENGINEERING CHEMISTRY –II UNIT-I Electrochemistry Principles Redox reactions Redox stands for reduction-oxidation‚ and are electrochemical processes involving electron transfer to or from a molecule or ion changing its oxidation state. This reaction can occur through the application of an external voltage or through the release of chemical energy. Oxidation and reduction Oxidation and reduction describe the change of oxidation state that takes place in the atoms‚ ions
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the product side by the moles of H2O on the reactant side‚ and we get the balanced chemical equation for the decomposition of water. Data Table Initial indicator color of the electrolysis solution Dark Blue Chnages occuring at the positive (+) electrode Bright Yellow Changes
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the heart as well as the quantity and quality of heart contractions. An EKG‚ along with blood work to measure troponin levels‚ can definitively determine whether or not a person has suffered from a myocardial infarction. In order to obtain an EKG‚ electrodes are strategically placed on the limbs and torso of a subject to measure the electrical current that is generated in the heart and transferred to the skin. The electrical signal is first generated in the sinoatrial node (SA node). It then travels
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