Revision checklist for IGCSE Chemistry 0620 A guide for Students Revision checklist for IGCSE Chemistry 0620 A guide for students How to use this guide The guide describes what you need to know about your IGSCE Chemistry examination. It will help you to plan your revision programme for the theory examinations and will explain what the examiners are looking for in the answers you write. It can also be used to help you to revise by using tick boxes in Section 3‚ ‘What you need to know’‚ to check
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know this! * Be able to name the five types of bonds (covalent (2 types)‚ ionic and weak chemical bonds (2 types)). What needs to happen for each of these bonds to be created? For example‚ for a covalent bond electrons must be shared equally between two elements and these elements will share unpaired valence electrons. Polar covalent unequal sharing of electrons‚ nonpolar covalent equal sharing of electrons‚ ionic transfer of electrons‚ H-bond between H and O/N/F inter- or intra-molecularly
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Order getter Definition The role most synonymous with selling is a position in which the salesperson is actively engaged in using their skills to obtain orders from customers. One highly challenging yet potentially lucrative example of this are sales positions where the main objective is to find new customers. Sales jobs in this category are often in fields that are very competitive‚ but offer high rewards for those that are successful. The key distinguishing factor of these positions is that
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(CH3)3N c) CH3CH2NHCH3 d) CH3CH2CH2NH2 e) H2NCH2CH2NH2 8. Which of the following ionic compounds should have the highest melting point? a) LiBr b) MgO c) NaI d) CaS e) NaCl 9. Given the bond enthalpies N-H (389)‚ Cl-Cl (243)‚ N-Cl (201)‚ H-Cl (431) in kJ/mol‚ compute ΔH in kJ/mol for: NH3 + Cl2 NH2Cl+ HCl a) 0 b) -393 c) -110 d) +393 e) +71 10. Which of the following molecules contains both ionic and covalent bonds? a) C6H14 b) MgCl2 c) (NH4)2SO4 d) H2O 11. A polar solute
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SYLLABUS Cambridge O Level Chemistry 5070 For examination in June and November 2014 University of Cambridge International Examinations retains the copyright on all its publications. Registered Centres are permitted to copy material from this booklet for their own internal use. However‚ we cannot give permission to Centres to photocopy any material that is acknowledged to a third party even for internal use within a Centre. © University of Cambridge International Examinations 2011 Contents
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ELECTRONEGATIVITY This page explains what electronegativity is‚ and how and why it varies around the Periodic Table. It looks at the way that electronegativity differences affect bond type and explains what is meant by polar bonds and polar molecules. If you are interested in electronegativity in an organic chemistry context‚ you will find a link at the bottom of this page. What is electronegativity Definition Electronegativity is a measure of the tendency of an atom to attract a bonding pair
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1. What is the purpose of science? The purpose of science is to understand. With science‚ we ask questions‚ seek answers‚ and prove or disprove our theories and speculations. According to the text on page 10 “Science is a way of knowing about the natural world.” (Citations will be provided at the end of the worksheet‚ rather than a continuous re-pasting each time.) 2. Define organism. Give an example of a unicellular organism. According to the text on page 3‚ “Organisms‚ such as trees and humans
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Water has many unique properties that make life possible on Earth. One property is cohesion. The cohesion property is properly defined as the binding of water molecules by hydrogen bonds. Water has this property as a result of the chemical bonding between water. Cohesion of the strong hydrogen bonds allows the water molecules to stick together‚ almost as a unit of one. A force exerted on one of the molecules will be exerted on all of the adjacent molecules as a result of cohesion. Cohesion‚ often
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differences between atoms result in nonpolar covalent bonds‚ polar covalent bonds‚ and ionic bonds. The difference in electronegativity between atoms results in different kinds of bonds: nonpolar covalent bonds form between atoms that have similar electronegativity and share bond electrons equally; polar covalent bonds form between atoms that have different levels of electronegativity and share bond electrons unequally; ionic bonds form between pairs of atoms that have extremely different
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1. Polar molecules A. have bonds with an unequal distribution of electric charge. B. must form ions in water solution. C. have bonds with an equal distribution of electrical charge. D. have bonds with an overall negative charge. E. have bonds with an overall positive charge. Correct See Section 2.2: How Do Atoms Bond to Form Molecules? Points Earned: 1/1 Correct Answer: A Your Response: A 2. Hydrocarbons are _______ and _______‚ whereas salts are _______ and _______. A. nonpolar;
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