《新综合科学 牛津原版 2》PDF下载

  • 购买积分:11 如何计算积分?
  • 作  者:郑书皓编
  • 出 版 社:上海:上海远东出版社;牛津大学出版社
  • 出版年份:1999
  • ISBN:7806138692
  • 页数:257 页
图书介绍:

Unit 7 Living Things and AirCommon gases 2

Composition of the air 6

What is air? 10

Uses of the gases in air 10

Breathed and unbreathed air 11

What makes these differences? 14

Respiration 15

How air passes in and out of us 17

Breathing in and out 19

Different breathing systems 23

Do plants respire? 24

How do plants obtain energy? 27

Most plants contain starch 28

Photosynthesis  31

Oxygen/carbon dioxide balance 33

Photosynthesis and food chains 34

Food webs  34

The pollution of our air 36

Summary  37

Difficult words  40

Unit 8 ElectricityUse of electricity  42

Conductors,insulators  48

Electric current 49

Resistance  50

Lighting and heating effects 53

Fuses and circuit breakers 58

Electricity at home 59

Magnetism  72

Electromagnets 77

Electrochemistry  82

Summary 85

Difficult words 87

Unit 9 Heat TransferHeat energy 92

Heat transfer in gases 93

Convection in liquids 96

Heat transfer in solids 99

Conduction in air and water 101

Radiation 103

Applications of heat transfer 108

How living creatures keep warm 112

Summary 115

Difficult words 117

Unit 10 Hydrogen,Acids and AlkalisProperties of hydrogen 120

Some uses of hydrogen 122

Breaking down water 123

Metals and water 126

Reactivity 134

Metals and acids 135

Reacting with sulphuric acid 137

Comparing reaction rates 138

Reactivity series 140

Acids and alkalis 141

The pH scale 145

Acid+Alkali=?  147

Neutralization and concentration 150

Applications of neutralization 154

Summary 156

Difficult words 159

Unit 11 Detecting the environmentOur senses and sense organs 162

Light and eyes 164

How a pinhole camera works 166

Thick lens and thin lens 172

Making sharp images 174

How our eyes see objects 174

How cameras 'see' objects 175

Comparing the eye with the camera 176

Normal eye,long and short sight 176

Limitations of vision 180

The noisy world 183

Pitch 188

Transmission of sound 191

The range of hearing 197

Taste and smell 198

The sense of smell 203

Skin  207

Into the brain  209

Persistence of vision 212

Summary 214

Difficult words 217

Unit 12 Forces and MovementWhat is force? 220

Friction  226

Weighing  231

Levers 235

Using levers 237

Human lever systems 239

Work and energy 242

Pulleys 245

Action and reaction  247

Summary 251

Difficult words  254

Index  255