...strength with the size of the molecular electron cloud. When a molecule contains atoms whose electronegativities differ significantly and the resulting bond dipoles do not cancel each other’s effects, dipole forces occur. This results in higher melting and boiling points than for nonpolar substances. The third type of intermolecular force, the hydrogen bond, occurs when one molecule contains a hydrogen atom connected to a highly electronegative partner. The other molecule must contain an electronegative atom, like fluorine, oxygen, or nitrogen, which has a lone pair. Although each hydrogen bond is weak compared with a covalent bond, large numbers of hydrogen bonds can have very significant effects. One example of this is in the properties of water. This highly unusual liquid plays a major role in making living systems and the earth’s environment behave as they do. Carbon normally forms four bonds, and carbon-carbon bonds are quite strong, allowing formation of long chains to which side branches and a variety of functional groups may be attached. Hence the number of molecular structures which can be adopted by organic compounds is extremely large. Functional groups containing oxygen atoms, nitrogen atoms, and multiple bonds often determine the chemical and physical properties of carbon compounds. Therefore organic chemistry may be systematized by studying related groups of compounds such as alkanes, cycloalkanes, aromatic compounds, alkenes and alkynes, alcohols, ethers, aldehydes...
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... NaCl, mp = 800 oC MgO, mp = 2800 oC Intermolecular Attractions Coulomb’s Law Force ~ (n+)(n-)/d2 Distance - twice the distance = 1/4 the force Charge on the Ion Magnitude of the dipole Composition - Solids and Liquids are closer so composition has greater role in attractive forces Attraction Between Ions and Permanent Dipoles Water is highly polar and can interact with positive ions to give hydrated ions in water. Attraction Between Ions and Permanent Dipoles Water is highly polar and can interact with positive ions to give hydrated ions in water. Dissolving Ionic Solids Attraction Between Ions and Permanent Dipoles Many metal ions are hydrated. It is the reason metal salts dissolve in water. Attraction Between Ions and Permanent Dipoles Attraction between ions and dipole depends on ion charge and ion-dipole distance. Measured by DHhydration for Mn+ + H2O --> [M(H2O)x]n+ Solvation (aka hydration) Attraction Between Ions and Permanent Dipoles Attraction between ions and dipole depends on ion charge and ion-dipole distance. Measured by DH for Mn+ + H2O --> [M(H2O)x]n+ Consider the following Explain why...
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...CARIBBEAN EXAMINATIONS COUNCIL Caribbean Secondary Education Certificate CSEC® CHEMISTRY SYLLABUS Effective for examinations from May–June 2015 CXC 21/G/SYLL 13 Published by the Caribbean Examinations Council. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form, or by any means electronic, photocopying, recording or otherwise without prior permission of the author or publisher. Correspondence related to the syllabus should be addressed to: The Pro-Registrar Caribbean Examinations Council Caenwood Centre 37 Arnold Road, Kingston 5, Jamaica Telephone Number: + 1 (876) 630-5200 Facsimile Number: + 1 (876) 967-4972 E-mail Address: cxcwzo@cxc.org Website: www.cxc.org Copyright © 2013 by Caribbean Examinations Council The Garrison, St Michael BB14038, Barbados CXC 21/G/SYLL 13 Contents RATIONALE ................................................................................................................................... AIMS ............................................................................................................................................. CANDIDATE POPULATION ............................................................................................................. SUGGESTED TIME-TABLE ALLOCATION ........................................................................................ ORGANISATION OF THE SYLLABUS .................................................
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...Year 11 Science Mentoring Task Booklet Things to remember when answering 6 mark exam questions: 1. 2. 3. 4. 5. 6. Try and remember everything you can about what the question is asking before you start answering it Make at least 6 points Write in full sentences starting with capital letters and ending with full stops Try and answer the question in around five minutes Check your answer to make sure you have not left anything out Remember to use key words when appropriate Things to remember when marking 6 mark exam questions: 1. 2. 3. 4. Use a green pen Read through the science points at the bottom of the mark scheme first In the answer put ticks to show where the marks are coming from Mark for spelling and grammar by circling the word or part of the text and writing above it as follows: • • • • 5. 6. 7. 8. Spelling mistake (Sp) Missing full stop (Gr) Missing capital letter (Gr) Poor grammar (Gr) Cross out any bits that are irrelevant to the question Add up their total number of marks If there are more than three spelling or grammar errors minus one mark Leave constructive feedback Biology Cells Tissues & Organs Summary All living things are made up of cells. The structures of different types of cells are related to their functions. To get into or out of cells, dissolved substances have to cross the cell membranes. Cells Cells are the smallest unit of life. All living things are made of cells. Most human cells, like most other animal cells, have the following...
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...Physical Chemistry Understanding our Chemical World Physical Chemistry Understanding our Chemical World Paul Monk Manchester Metropolitan University, UK Copyright 2004 John Wiley & Sons Ltd, The Atrium, Southern Gate, Chichester, West Sussex PO19 8SQ, England Telephone (+44) 1243 779777 Email (for orders and customer service enquiries): cs-books@wiley.co.uk Visit our Home Page on www.wileyeurope.com or www.wiley.com All Rights Reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, scanning or otherwise, except under the terms of the Copyright, Designs and Patents Act 1988 or under the terms of a licence issued by the Copyright Licensing Agency Ltd, 90 Tottenham Court Road, London W1T 4LP, UK, without the permission in writing of the Publisher. Requests to the Publisher should be addressed to the Permissions Department, John Wiley & Sons Ltd, The Atrium, Southern Gate, Chichester, West Sussex PO19 8SQ, England, or emailed to permreq@wiley.co.uk, or faxed to (+44) 1243 770620. This publication is designed to provide accurate and authoritative information in regard to the subject matter covered. It is sold on the understanding that the Publisher is not engaged in rendering professional services. If professional advice or other expert assistance is required, the services of a competent professional should be sought. Other Wiley...
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...How is the scientific method used to solve problems? Scientific method used to solve problems by keen observations, rational analysis, and experimentation. Observation: Closely observe the physical world around you. How is the scientific method used to solve problems? Scientific method used to solve problems by keen observations, rational analysis, and experimentation. Observation: Closely observe the physical world around you. Question: Recognize a question or a problem. Hypothesis: An educated guess or a reasonable explanation. When the hypothesis can be tested by experiment, it qualifies as a scientific hypothesis Prediction: Consequences that can be observed if the hypothesis is correct. The consequences should be absent if the hypothesis is not correct. Conclusion: Formulate the simplest general rule that organizes the hypothesis, predicted effects, and experimental findings. What is the principle of falsifiability? For a hypothesis to be considered scientific it must be testable?it must, in principle, be capable of being proven wrong. Fact: A phenomenon about which competent observers can agree. Theory: A synthesis of a large body of information that encompasses well-tested hypotheses about certain aspects of the natural world. Law: A general hypothesis or statement about the relationship of natural quantities that has been tested over and over again and has not been contradicted. Also known as a principle. Evidence: which...
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...Answers to Conceptual Integrated Science End-of-Chapter Questions Chapter 1: About Science Answers to Chapter 1 Review Questions 1 The era of modern science in the 16th century was launched when Galileo Galilei revived the Copernican view of the heliocentric universe, using experiments to study nature’s behavior. 2 In Conceptual Integrated Science, we believe that focusing on math too early is a poor substitute forconcepts. 3 We mean that it must be capable of being proved wrong. 4 Nonscientific hypotheses may be perfectly reasonable; they are nonscientific only because they are not falsifiable—there is no test for possible wrongness. 5 Galileo showed the falseness of Aristotle’s claim with a single experiment—dropping heavy and lightobjects from the Leaning Tower of Pisa. 6 A scientific fact is something that competent observers can observe and agree to be true; a hypothesis is an explanation or answer that is capable of being proved wrong; a law is a hypothesis that has been tested over and over and not contradicted; a theory is a synthesis of facts and well-tested hypotheses. 7 In everyday speech, a theory is the same as a hypothesis—a statement that hasn’t been tested. 8 Theories grow stronger and more precise as they evolve to include new information. 9 The term supernatural literally means “above nature.” Science works within nature, not above it. 10 They rely on subjective personal experience and do not lead to testable hypotheses. They lie outside...
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...XXIII CHAPTER XXIII CHAPTER XXIV CHAPTER XXIV CHAPTER XXIV CHAPTER XXV CHAPTER XXV CHAPTER XXV CHAPTER XXVI CHAPTER XXVI CHAPTER XXVI General Science CHAPTER XXVII CHAPTER XXVII CHAPTER XXVII CHAPTER XXVIII CHAPTER XXVIII CHAPTER XXVIII CHAPTER XXIX CHAPTER XXIX CHAPTER XXIX CHAPTER XXX CHAPTER XXX CHAPTER XXX CHAPTER XXXI CHAPTER XXXI CHAPTER XXXI CHAPTER XXXII CHAPTER XXXII CHAPTER XXXII CHAPTER XXXIII CHAPTER XXXIII CHAPTER XXXIII CHAPTER XXXIV CHAPTER XXXIV CHAPTER XXXIV CHAPTER XXXV CHAPTER XXXV CHAPTER XXXV General Science The Project Gutenberg EBook of General Science, by Bertha M. Clark This eBook is for the use of anyone anywhere at no cost and with almost no restrictions whatsoever. You may copy it, give it away or re-use it under the terms of the Project Gutenberg License included with this eBook or online at www.gutenberg.net Title: General Science Author: Bertha M. Clark Release Date:...
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...To Annalena Part One "The Tributes" When I wake up, the other side of the bed is cold. My fingers stretch out, seeking Prim’s warmth but finding only the rough canvas cover of the mattress. She must have had bad dreams and climbed in with our mother. Of course, she did. This is the day of the reaping. I prop myself up on one elbow. There’s enough light in the bedroom to see them. My little sister, Prim, curled up on her side, cocooned in my mother’s body, their cheeks pressed together. In sleep, my mother looks younger, still worn but not so beaten-down. Prim’s face is as fresh as a raindrop, as lovely as the primrose for which she was named. My mother was very beautiful once, too. Or so they tell me. Sitting at Prim’s knees, guarding her, is the world’s ugliest cat. Mashed-in nose, half of one ear missing, eyes the color of rotting squash. Prim named him Buttercup, insisting that his muddy yellow coat matched the bright flower. I le hates me. Or at least distrusts me. Even though it was years ago, I think he still remembers how I tried to drown him in a bucket when Prim brought him home. Scrawny kitten, belly swollen with worms, crawling with fleas. The last thing I needed was another mouth to feed. But Prim begged so hard, cried even, I had to let him stay. It turned out okay. My mother got rid of the vermin and he’s a born mouser. Even catches the occasional rat. Sometimes, when I clean a kill, I feed Buttercup the entrails. He has stopped hissing at me. Entrails...
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...For James Proimos 2 PART I "THE TRIBUTES" 3 When I wake up, the other side of the bed is cold. My fingers stretch out, seeking Prim’s warmth but finding only the rough canvas cover of the mattress. She must have had bad dreams and climbed in with our mother. Of course, she did. This is the day of the reaping. I prop myself up on one elbow. There’s enough light in the bedroom to see them. My little sister, Prim, curled up on her side, cocooned in my mother’s body, their cheeks pressed together. In sleep, my mother looks younger, still worn but not so beaten-down. Prim’s face is as fresh as a raindrop, as lovely as the primrose for which she was named. My mother was very beautiful once, too. Or so they tell me. Sitting at Prim’s knees, guarding her, is the world’s ugliest cat. Mashed-in nose, half of one ear missing, eyes the color of rotting squash. Prim named him Buttercup, insisting that his muddy yellow coat matched the bright flower. I le hates me. Or at least distrusts me. Even though it was years ago, I think he still remembers how I tried to drown him in a bucket when Prim brought him home. Scrawny kitten, belly swollen with worms, crawling with fleas. The last thing I needed was another mouth to feed. But Prim begged so hard, cried even, I had to let him stay. It turned out okay. My mother got rid of 4 the vermin and he’s a born mouser. Even catches the occasional rat. Sometimes, when I clean a kill, I feed Buttercup the entrails...
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...Chap1 Comparing Apples and Oranges The concept of “apples and oranges” relates to the consistency of anything that is compared with something else. Whenever you make a comparison in sentence, you have to make sure the things you compare are , in fact, comparable. Than ①主语比较 1. Because the Earth’s crust is more solid there and thus better able to transmit shock waves, an earthquake in the eastern United States will typically devastate an area 100 times greater than will a quake of comparable magnitude occurring in the West.(D-P35-9) 2.Local residents claim that San Antonio, Texas, has more good Mexican American restaurants than does any other city in the United States. (D-p78-14) 3.The guiding principles of the tax plan released by the Treasury Department could have even greater significance for the economy than do the particulars of the plan. (C-p8-6) 4. Because natural gas is composed mostly of methane, a simple hydrocarbon, vehicles powered by natural gas emit less of certain pollutants than those burning gasoline or diesel fuel. (C-p8-16) 5. The United States government employs a much larger proportion of women in trade negotiations than does any other government. (C-p22-8) 6. The pay of senior executives increased in 1990 by a larger percentage than did the wages of other salaried workers. (C-p67-5) 7. A newly developed jumbo rocket, which is expected to carry the United States into its next phase of space exploration, will be able to deliver a heavier load...
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...NINTH EDITION Burton’s MICROBIOLOGY FOR THE HEALTH SCIENCES Paul G. Engelkirk, PhD, MT(ASCP), SM(AAM) Biomedical Educational Services (Biomed Ed) Belton, Texas Adjunct Faculty, Biology Department Temple College, Temple, TX Janet Duben-Engelkirk, EdD, MT(ASCP) Biomedical Educational Services (Biomed Ed) Belton, Texas Adjunct Faculty, Biotechnology Department Temple College, Temple, TX Acquisitions Editor: David B. Troy Product Manager: John Larkin Managing Editor: Laura S. Horowitz, Hearthside Publishing Services Marketing Manager: Allison Powell Designer: Steve Druding Compositor: Maryland Composition/Absolute Service Inc. Ninth Edition Copyright © 2011 Lippincott Williams & Wilkins, a Wolters Kluwer business © 2007 Lippincott Williams & Wilkins, © 2004 Lippincott Williams & Wilkins, © 2000 Lippincott Williams & Wilkins, © 1996 Lippincott-Raven, © 1992, 1988, 1983, 1979 JB Lippincott Co. 351 West Camden Street Baltimore, MD 21201 Printed in the People’s Republic of China All rights reserved. This book is protected by copyright. No part of this book may be reproduced or transmitted in any form or by any means, including as photocopies or scanned-in or other electronic copies, or utilized by any information storage and retrieval system without written permission from the copyright owner, except for brief quotations embodied in critical articles and reviews. Materials appearing in this book prepared by individuals as part of their official duties as U.S. government employees...
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...THE FUTURE OF TECHNOLOGY OTHER ECONOMIST BOOKS Guide to Analysing Companies Guide to Business Modelling Guide to Business Planning Guide to Economic Indicators Guide to the European Union Guide to Financial Markets Guide to Management Ideas Numbers Guide Style Guide Dictionary of Business Dictionary of Economics International Dictionary of Finance Brands and Branding Business Consulting Business Ethics Business Strategy China’s Stockmarket Globalisation Headhunters and How to Use Them Successful Mergers Wall Street Essential Director Essential Economics Essential Finance Essential Internet Essential Investment Essential Negotiation Pocket World in Figures THE FUTURE OF TECHNOLOGY THE ECONOMIST IN ASSOCIATION WITH PROFILE BOOKS LTD Published by Profile Books Ltd 3a Exmouth House, Pine Street, London ec1r 0jh Copyright © The Economist Newspaper Ltd 2005 All rights reserved. Without limiting the rights under copyright reserved above, no part of this publication may be reproduced, stored in or introduced into a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording or otherwise), without the prior written permission of both the copyright owner and the publisher of this book. The greatest care has been taken in compiling this book. However, no responsibility can be accepted by the publishers or compilers for the accuracy of the information presented. Where opinion is expressed it is that of the author and does not necessarily...
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...1000 Real GMAT Sentence Correction Questions 1. 1 A “calendar stick” carved centuries ago by the Winnebago tribe may provide the first evidence that the North American Indians have developed advanced full-year calendars basing them on systematic astronomical observation. (A) that the North American Indians have developed advanced full-year calendars basing them (B) of the North American Indians who have developed advanced full-year calendars and based them (C) of the development of advanced full-year calendars by North American Indians, basing them (D) of the North American Indians and their development of advanced full-year calendars based (E) that the North American Indians developed advanced full-year calendars based 2. A 1972 agreement between Canada and the United States reduced the amount of phosphates that municipalities had been allowed to dump into the Great Lakes. (A) reduced the amount of phosphates that municipalities had been allowed to dump (B) reduced the phosphate amount that municipalities had been dumping (C) reduces the phosphate amount municipalities have been allowed to dump (D) reduced the amount of phosphates that municipalities are allowed to dump (E) reduces the amount of phosphates allowed for dumping by municipalities 3. A collection of 38 poems by Phillis Wheatley, a slave, was published in the 1770’s, the first book by a Black woman and it was only the second published by an American woman. (A) it was only the second published by...
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...first published. However, we can take no responsibility for the subsequent use of this information, nor for any errors or omissions it may contain. Published by Construction Research Communications Ltd by permission of Building Research Establishment Ltd Requests to copy any part of this publication should be made to: CRC Ltd Building Research Establishment Bucknalls Lane Watford, WD25 9XX BRE material is also published quarterly on CD Each CD contains BRE material published in the current year, including reports, specialist reports, and the Professional Development publications: Digests, Good Building Guides, Good Repair Guides and Information Papers. The CD collection gives you the opportunity to build a comprehensive library of BRE material at a fraction of the cost of printed copies. As a subscriber you also benefit from a 25% discount on other BRE titles. For more information contact: CRC Customer Services on 020 7505 6622 Construction Research Communications CRC supplies a wide range of building and construction related information products from BRE and other highly respected organisations. Contact: post:...
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