1、PhotoDisci-01-LBL-861767 8/23/04 2:24 PM Page iChemistryWater droplets condense onthe surface of a flask that hasbeen cooled by a chemicalreaction.A chemical changeproduces new substances that have properties differentfrom those of the originalsubstances.The change intemperature is an indicationthat
2、 a chemical reaction hastaken place.Send all inquiries to:Glencoe/McGraw-Hill8787 Orion PlaceColumbus,OH 43240-4027ISBN:0-07-861767-7Printed in the United States of America.2 3 4 5 6 7 8 9 10 027/111 09 08 07 06 05 04Copyright 2005 by The McGraw-Hill Companies,Inc.All rights reserved.Except as permi
3、tted underthe United States Copyright Act,no part of this publication may be reproduced or distributed in anyform or by any means,or stored in a database or retrieval system,without prior written permission of the publisher.The National Geographic features were designed and developed by the National
4、 Geographic SocietysEducation Division.Copyright National Geographic Society.The name“National Geographic Society”and the Yellow Border Rectangle are trademarks of the Society,and their use,without prior writtenpermission,is strictly prohibited.The“Science and Society”and the“Science and History”fea
5、tures that appear in this book weredesigned and developed by TIME School Publishing,a division of TIME Magazine.TIME and the redborder are trademarks of Time Inc.All rights reserved.PhotoDisci-01-LBL-861767 8/23/04 2:24 PM Page iiCONTENT Linda McGawScience Program Coordinator Advanced Placement Stra
6、tegies,Inc.Dallas,TXMATH Michael Hopper,DEngManager of Aircraft Certification L-3 CommunicationsGreenville,TXREADING Rachel Swaters-KissingerScience Teacher John Boise Middle SchoolWarsaw,MOSAFETY Aileen Duc,PhDScience 8 TeacherHendrick Middle School,Plano ISDPlano,TXSandra West,PhDDepartment of Bio
7、logyTexas State University-San MarcosSan Marcos,TXACTIVITY TESTERS Nerma Coats HendersonPickerington Lakeview Jr.HighSchoolPickerington,OHMary Helen Mariscal-CholkaWilliam D.Slider Middle SchoolEl Paso,TXScience Kit and BorealLaboratoriesTonawanda,NYLiiiAuthorsSeries ConsultantsSharla AdamsIPC Teach
8、erAllen High SchoolAllen,TXDesiree BishopEnvironmental Studies CenterMobile County Public SchoolsMobile,ALTom BrightConcord High SchoolCharlotte,NC Joanne DavisMurphy High SchoolMurphy,NC Annette ParrottLakeside High SchoolAtlanta,GANora M.Prestinari BurchettSaint Luke School McLean,VAKaren WatkinsP
9、erry Meridian Middle SchoolIndianapolis,IN Series ReviewersEducation DivisionWashington,D.C.Eric Werwa,PhDDepartment of Physics andAstronomyOtterbein CollegeWesterville,OHDinah ZikeEducational ConsultantDinah-Might Activities,Inc.San Antonio,TXi-01-LBL-861767 8/23/04 2:24 PM Page iiiWhy do I need my
10、 science book?Have you ever been in class andnot understood all of what waspresented?Or,you understoodeverything in class,but at home,got stuck on how to answer aquestion?Maybe you just wondered when you were evergoing to use this stuff?These next few pages are designed to help you understand everyt
11、hing your science book can be used for.besides a paperweight!Before You ReadChapter OpenerScience is occurring all around you,and the opening photo of each chapter will preview thescience you will be learning about.The ChapterPreview will give you an idea of what you will belearning about,and you ca
12、n try the Launch Lab tohelp get your brain headed in the right direction.TheFoldables exercise is a fun way to keep you organized.Section OpenerChapters are divided into two to foursections.The As You Read in the margin of the firstpage of each section will let you know what is mostimportant in the
13、section.It is divided into four parts.What Youll Learn will tell you the major topics youwill be covering.Why Its Important will remind youwhy you are studying this in the first place!TheReview Vocabulary word is a word you already know,either from your science studies or your prior knowl-edge.The N
14、ew Vocabulary words are words that youneed to learn to understand this section.These wordswill be in boldfaced print and highlighted in thesection.Make a note to yourself to recognize thesewords as you are reading the section.(bkgd)John Evans,(inset)PhotoDisci-01-LBL-861767 8/23/04 2:24 PM Page ivAs
15、 You ReadHeadingsEach section has a titlein large red letters,and is furtherdivided into blue titles andsmall red titles at the begin-nings of some paragraphs.To help you study,make anoutline of the headings andsubheadings.MarginsIn the margins ofyour text,you will find many helpfulresources.The Sci
16、ence Online exercises andIntegrate activities help you explore the topicsyou are studying.MiniLabs reinforce the sci-ence concepts you have learned.Building SkillsYou also will find anApplying Math or Applying Science activityin each chapter.This gives you extra prac-tice using your new knowledge,and helpsprepare you for standardized tests.Student ResourcesAt the end of the bookyou will find Student Resources to help youthroughout your studies.These includeScience,Technology,and Math Skill Hand-
