Alginate is an irreversible hydrocolloid impression material commonly used due to its ease of handling with minimal equipment [1]‚ fast set‚ reliability and low price. However‚ its disadvantages include poor tear strength‚ permanent deformation of up to 1.5% and dimensional change [2]. In this scenario‚ dimensional change takes place during disinfection of the alginate‚ affecting the subsequent cast and denture‚ and I will be exploring how this has happened and what can be done to avoid it. Dimensional
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CHEMISTRY (Theory) Time allowed : 3 hours General Instructions: (i) All questions are compulsory. Maximum Marks : 70 (ii) Marks for each question are indicated against it. (iii) Question numbers 1 to 8 are very short-answer questions and carry 1 mark each. (iv) Question numbers 9 to 18 are short-answer questions and carry 2 marks each. (v) Question numbers 19 to 27 are also short-answer questions and carry 3 marks each. (vi) Question numbers 28 to 30 are long-answer questions and carry 5 marks
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Prevention of Communicable Diseases Tuberculosis: Infection control strategies: There are three levels of infection control (IC) measures: administrative (managerial)‚ environmental‚ and personal respiratory protection. Administrative controls are the most important since environmental controls and personal respiratory protection will not work in the absence of solid administrative control measures. Each level operates at a different point in the transmission process: • Administrative
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Data Tables: Part 1: Chemicals Well No. Observations of the Reaction A. NaHCO3 + HCl A1 Bubbles immediately formed and started popping (not rapidly). This could be seen more easily with the black paper underneath the well plate B. HCl + BTB C1 Once I added the Bromothymol Blue indicator‚ it turned an orange-like color C. NH3 + BTB E1 The reaction turned dark blue. When Bromothymol Blue reacts with an acid‚ it turned orange‚ and when it reacts with a base‚ the end result is blue. D. HCl
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gases liberated at anode and cathode respectively when an aqueous solution of sodium chloride is electrolysed. 13. Given 2NO(g) + O2 (g) ¾¾ 2NO2(g) ; rate = k[NO]2 [O2]1. By how many times ® does the rate of the reaction change when the volume of the reaction vessel is reduced to 1/3rd of its original volume? Will there be any change in the order of the reaction? 14. Give reasons: i) actinoids show variable oxidation states ii) Zr and Hf have almost identical radii 15. What is Lucas reagent
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A) Lothar Meyer B) Ernest Rutherford C) Michael Faraday D) Dmitri Mendeleev E) Henry Moseley 2) Elements in the modern version of the periodic table are arranged in order of increasing __________. A) oxidation number B) atomic mass C) atomic number D) number of isotopes E) average atomic mass 3) Electrons in the 1s subshell are much closer to the nucleus in Ar than in He due to the larger __________ in Ar. A)
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most obvious and the nitrogen levels in the discharged water would be another challenge. 8. Is the water treated prior to its discharge? If so‚ with what? Sodium hypochlorite (bleach solution) is used to kill remaning organisms in the water grom the final settling tanks. The second stage is water DE chlorination‚ this is where chemical (sodium bisulfite) is used to neutralize the bleach prior to the clean water discharge. 9. Where is the treatment water discharged? Potomac River 10. Who monitors
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THE 4 QUALITIES OF GOOD WATER by Dr. Robert O. Young There are many measurements of water‚ but the most important for determining the best water to drink are‚ the pH‚ oxidative reduction potential—or energy potential/activity—molecular structure‚ and purity. Science has helped us to determine that the best measurements for our drinking water are the pH and purity‚ but little understood is the importance of the molecular structure of water. Assuming that most waters that humans are drinking
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Experiment 1: Mechanism of Nitrile Oxide and Alkene Cycloaddition 1. Purpose: to clarify the mechanism for the cycloaddition reaction between benzonitrile oxide and an alkene‚ and to test the regiochemistry of the reaction between benzonitrile oxide and styrene. 2. Plan: Each student in a group of three will work to create a reaction with the Benzonitrile Oxide with‚ cis-stilbene‚ trans-stilbene‚ or styrene in an Erlenmyer flask. With this Reaction solution thin layer chromatography will be
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#2 (4 drops) Observations: Chemical Change (Y/N) A1 NaHCO3 (Sodium Bicarbonate) HCl (Hydrochloric Acid) Bubbles‚ no change in color‚ clear‚ Y A2 NaOCl (Sodium Hypochlorite) KI (Potassium Iodide) Observation 1: clear‚ no color change.
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