Fireworks and What Makes Them Go Sparks! Colors! Things that go BOOM! Chemistry doesn’t get much better than this. Ever notice how minutes drag on for hours when you’re waiting for a fireworks show to begin? Everyone’s thinking the same thing: The sky is dark enough the hot dogs are all eaten…come on when are they going to start? Then the first rockets streak into the sky…Ooh! Aah! Yes‚ it was worth the wait. The birthplace of fireworks is generally recognized as China.
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PAHANG TRIAL 2009 EXAMINATION CHEMISTRY PAPER 2 MARKING SCHEMES SECTION A - Structural Questions: Question 1. (a) (i) The presence of isotopes 1M (ii) Let the abundance of 63X be a %. The % abundance of 65X. = ( 100 – a ) 1M Relative atomic mass = ( 62.93 x a) + ( 64.93 x ( 100 -a) ) 1M
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Match and Water in a Glass Science Magic Trick Fun Trick with Fire and Water This is a simple and interesting science magic trick involving fire and water. All you need is water‚ a glass‚ a plate‚ and a couple of matches. Pour water into a plate‚ light a match in the center of the dish and cover it with a glass. The water will be drawn into the glass. Match and Water Trick Materials • plate • water • 2 wooden matches • a quarter or other large coin • colored water
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A Comparative Study On The Combustibility Of Ethanol (C2H5OH) And Hydrogen Peroxide (H2O2) Mixtures As Fuel Chemistry January 31‚ 2013 Revised February 15‚ 2013 Abstract In this experiment‚ the proponents used mixtures with varied proportions of ethanol and hydrogen peroxide to know which would make a more efficient‚ clean‚ and stable combination. Compared to conventional fuels‚ ethanol contains 36% oxygen thus resulting in more complete combustion. This greatly lowers
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changing & challenging environments on business practice in all sectors Task 1: Assignment/ Research (Due: mid Feb) LO 1 AS 3 Socioeconom issues e.g. HIV/Aids OR unemploym’t programme LO 1 AS 1 – 4 LO 2 AS 1 & 2 LO 4 AS 1 & 2 Task2: March Exam (1 Paper – 2hrs) Task1. Assignment (Due: March) Social‚ cultural & demographic issues PHASE 2 (8 April 2013 – 21 June 2013) TERM 1/ 2 Module 2 Business Ventures Identify & research viable business opportunities & explore these & related
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Chemistry Revision F331 Isotopes - atoms with the same atomic number‚ but different mass numbers 131I - radioactive tracer for thyroid. 99Tc for tumours. Radioisotopes - gamma emitters & short half life - long enough to detect‚ but not long enough for damage. Beta particles emitters are more useful than alpha particle emitters because they penetrate more and so are more easily detected. Also‚ less damaging. The half life is the time taken for half the isotope to decay Mass left = initial
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Stepper Motor A stepper motor (or step motor) is a brushless DC electric motor that divides a full rotation into a number of equal steps. The motor’s position can then be commanded to move and hold at one of these steps without any feedback sensor (an open-loop controller)‚ as long as the motor is carefully sized to the application. Switched reluctance motors are very large stepping motors with a reduced pole count‚ and generally are closed-loop commutated. Fundamentals of operation DC brush motors
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Bibliography: Heyworth‚ Rex M Dr‚ and J G R Briggs. Chemistry Insights. Singapore: Pearson Education South East Asia‚ 2007 http://www.google.com http://www.ausetute.com.au/elecysis.html http://www.nmsea.org/Curriculhttp://www.nmsea.org/Curriculum/7_12/electrolysis/electrolysis.htmum/7_12/electrolysis/electrolysis
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General Knowledge India Kalpana General Knowledge India Kalpana This file was generated by an automated blog to book conversion system. Its use is governed by the licensing terms of the original content hosted at www.indiagk.in/. Powered by Pothi.com http://pothi.com Contents Latest General knowledge - August 2012 GK related to Olympics 2012 Who’s Who India‚ August 2012 GK questions July‚ 2012 -V General Knowledge India July‚ 2012- IV Latest General Knowledge July‚ 2012- III Latest
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Adjutant-General James A. Ulio M Smith James A. Ulio was born June 29‚ 1882 in Walla Walla Washington. He enlisted in the Regular Army in September 1900 at eighteen years old. While enlisted‚ he served as private‚ corporal‚ and battalion sergeant major. He received a commission as an Infantry Officer (second lieutenant) in October 1904. His career as an Officer began with the First Infantry. In August 1916‚ as a Captain‚ he joined the Thirty-second Infantry until promotion to Major where
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