IGCSE London Examinations IGCSE Anthology for English Language (4355) For examination in May and November 2005‚ 2006‚ 2007 April 2003‚ Issue 1 delivered locally‚ recognised globally Anthology Anthology for English Language (4355) London Examinations IGCSE Edexcel is one of the leading examining and awarding bodies in the UK and throughout the world. We provide a wide range of qualifications including academic‚ vocational‚ occupational and specific programmes for employers. Through
Premium Harriet Tubman
had on the environment. · Evaluate and compare the advantages and disadvantages of different renewable and nonrenewable energy resources including cost‚ environmental effects‚ and availability. Lesson 08.05: Carbon Chemistry · Define and compare inorganic and organic chemistry. · Compare diamonds and graphite in terms of bonding and properties. · Describe the properties of the carbon atom that allow it to form such a wide variety of compounds. · Identify the basic steps in the carbon cycle
Premium Functional group Carbon Alcohol
Chem 3418 Organic Chemistry Laboratory I Acid Base Review Definition In general‚ an acid is a substance that can donate a proton (H+) and a base is a substance that can accept a proton. Any proton in an organic molecule can potentially be donated. The most acidic proton in a molecule would be donated first. Any lone pair in an organic molecule can act as the proton acceptor. An acid (HA) reacts with a base (in this case H2O) to form the conjugate base of the acid (A-) and the conjugate acid of the
Premium Acid dissociation constant Acetic acid Acid
IGCSE REVISION NOTES The basic economic problem: scarcity and exercise of choice . igcse economics - Scarce resources & unlimited wants This is the reason for the existence of this subject. In reality most resources are scarce. Similarly individuals and nations have unlimited wants. [pic] The Basics [pic] Scare Resources There are only a limited number of resources such as workers‚ machines‚ factories‚ raw materials etc. Yet there are a number of different ways in which they could
Premium Supply and demand
Module 16 Notes Reduction/Oxidation Reactions • Oxidation number: The charge that an atom in a molecule would develop if the most electronegative atoms in the molecule took the shared electrons from the less electronegative atoms. • Oxidation numbers are not real; they are only based on assumptions. They are useful bookkeeping tools though‚ and can help us keep track of electrons during a reaction. • The sum of all oxidation numbers in a molecule must equal the charge of that molecule. • Rules
Premium Atom Electric charge Ion
communication will be assessed in your responses to Sections B and C – you should take particular care on these questions with your spelling‚ punctuation and grammar‚ as well as the clarity of expression. Copies of the Edexcel Anthology for IGCSE English Language and IGCSE English Literature may not be brought into the examination. Dictionaries may not be used in this examination. Advice Read each question carefully before you start to answer it. Keep an eye on the time. Try to answer every question
Premium Race The Passage
Percent Composition Report Hypothesis : By using seperation techniques properly‚ the 3 substance such as; water‚ sand‚ and salt can be seperated and the percent composition of each substance. Which will then be calculated theoritically and after comparison with the actual result‚ the accuracy of the 2 result can be found. Aim : The aim of this experiment is to compare the gravimetric result of the original mixture and the separated substance. The other objective is to calculate each percent
Premium Mathematics Mixture Analytical chemistry
Investigation – Storage conditions of Bleach & it’s relation with temperature. Title/Research Question: ‘How does temperature effect the concentration of chlorate ions in bleach?’ Aim: The aim of this experiment was to investigate the optimum temperature storage conditions of bleach’s stored at different temperatures. Introduction: Chlorine bleaches are made by dissolving chlorine in sodium hydroxide solution. They have a number of uses as they are used to remove colors‚ whiten or disinfectant
Premium Chlorine Sodium hydroxide Iodine
An investigation to show how the rate of reaction between hydrochloric acid and sodium thiosulphate is affected by the concentration of the acid Simple Procedure Place a conical flask on a piece of paper with a cross on it. Add hydrochloric acid and sodium thiosulphate‚ and record the amount of time taken for the cross to disappear through the solution from the top of the flask. Record this time and repeat this for different concentrations of hydrochloric acid. Fair Test The variables in
Premium Chemical reaction Chemistry Concentration
conjunction with the question papers and the Report on the Examination. • CIE will not enter into discussion or correspondence in connection with these mark schemes. CIE is publishing the mark schemes for the November 2004 question papers for most IGCSE and GCE Advanced Level syllabuses. Grade thresholds taken for Syllabus 0418 (Information Technology) in the November 2004 examination. Component 2 maximum mark available 80 minimum mark required for grade: A C E F 48
Premium Computer General Certificate of Secondary Education Expert system