-1A2 CHEMISTRY MODULE 4 definitions (aqa) Rate of Reaction The rate of change of concentration with time (mathematically d[X]/dt). Units are mol.dm-3.s-1 (moles per cubic decimetre per second) Initial Rate This is the rate at the very beginning of the reaction when all the starting concentrations are known exactly. Rate Equation Rate Expression A mathematical expression which relates the rate to the concentrations of substances involved in the reaction Rate Constant‚ k This is the multiplying
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Chemistry Notes Cracking: * 2 types of Cracking; Catalytic cracking and Steam/thermal cracking. * Catalytic cracking‚ using a catalyst called Zeolite (Aluminosilicate)‚ 500 degrees C‚ in the absence of air and at pressures just above atmospheric * Thermal cracking is done without a catalyst; steam is passed through very hot metal tubes at 700-1000 degrees C at just above atmospheric pressure. * This is used to break down longer chains of unsalable hydrocarbons into smaller salable
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Chemistry in Photography Background A photograph is an image made by a photo-chemical reaction which records the impression of light on a surface coated with silver atoms. The reaction is possible due to the light-sensitive properties of silver halide crystals. Equation form for silver halides: Ag + + e - Ag Species produced include: Ag2+‚ Ag2o‚ Ag3+‚ Ag3o‚ Ag4+‚ Ag4o In 1556‚ the alchemist Fabricius was the first to discover that light can photochemically react with these crystals to
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Environmental Chemistry: Water testing in Bouregreg Valley Nowadays we are more and more concerned of environmental issues and especially the ones about water since experts have remarked that wetland regions are disappearing (50% reduction). Wetland regions are very important because they help preserve different wildlife species and also can be considered important indicators of the health of the “blue planet”. One of the most interesting wetland regions is the Bouregreg one that is close to
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Chemistry Coursework – Titration Background Science A titration is the neutralisation of an acid or an alkali. To achieve this‚ one must be added to the other in a specific amount‚ strength and concentration. A substance is neutral when its pH is 7. It is most acidic closer to 0 and is most alkaline closer to 14. 28492453194050 0 7 14 595423979670
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"Abeta-mediated ROS production by Cu ions: structural insights‚ mechanisms and relevance to Alzheimer ’s disease". Biochimie 91 (10): 1212–7. doi:10.1016/j.biochi.2009.03.013. PMID 19332103. 20. ^ C. A. Flemming and J. T. Trevors (1989). "Copper toxicity and chemistry in the environment: a review". Water‚ Air‚ & Soil Pollution 44 (1-2): 143–158. doi:10.1007/BF00228784. 21. ^ Prociv P (September 2004). "Algal toxins or copper poisoning--revisiting the Palm Island "epidemic"". Med. J. Aust. 181 (6): 344. PMID 15377259
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Conflict in Vietnam‚ 1963-75 Revision Notes This topic is in Paper 2‚ the source-based exam – along with World War One. There is no choice of question. The paper tests your source skills‚ but you must have a good knowledge of the topic as well - and be able to use this both in your answers and in order to understand the sources properly. Read the advice on the front of your WW1 revision pack for tips on how to answer the exam questions. Part 1; Reasons for the US involvement in
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FACULTY OF RESOURCE SCIENCE AND TECHNOLOGY DEPARTMENT OF CHEMISTRY STK 1094 – Analytical Chemistry 1 EXPERIMENT NO : 1 TITLE OF EXPERIMENT : ACID – BASE TITRATIONS DATE OF EXPERIMENT : 27 SEPTEMBER 2013 GROUP MEMBERS & MATRIX NUMBERS : 1. DELVINO DISONNEO ANAK DALIN (44903) 2. GOH CHIA HONG (44927) 3.LINDA CHONG (41889) 4.LIM WHYE KIT LEONARD(41874) 5. LAB FACILITATOR : REPORT DUE DATE : 4 OCTOBER 2013 INTRODUCTION The laboratory
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Further Pure 1 Revision Notes • Proof by induction To prove by induction that a statement (C) involving an integer n is true for all [pic]‚ prove that‚ i) (C) is true for [pic]; ii) if (C) is true for [pic]then (C) is true for [pic]. And then bring these parts together to complete the proof. • Summing series using formulae To sum series‚ use a combination of the following formulae. Second two are given in formula book. [pic] [pic] [pic] e.g. Q:
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I Term Exam Chemistry Project Sunday‚ January 13‚ 2013 Grade/Section: Date: Question I: State whether each statement is true or false‚ then correct each incorrect statement. (7pts‚ 1 point each) 1- An Element is a substance that can be broken down into simpler substance by chemical means. 2- The Aufbau Principle states that energy levels must be filled from the highest to the lowest‚ when writing the election configuration. 3- Atomic radius decreases across a period
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