Page 3 - 新思维科学活动用书7 样章
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Contents
4.5 Constructing keys 91
5 Properties of materials 93
5.1 Metals and non-metals 93
5.2 Comparing metals and non-metals 96
5.3 Metal mixtures 101
5.4 Using the properties of materials to separate mixtures 103
5.5 Acids and alkalis 107
5.6 Indicators and the pH scale 109
6 Earth physics 113
6.1 Sound waves 113
6.2 Reflections of sound 116
6.3 Structure of the Earth 122
6.4 Changes in the Earth 124
6.5 Solar and lunar eclipses 126
7 Microorganisms in the environment 129
7.1 Microorganisms 129
7.2 Food chains and webs 133
7.3 Microorganisms and decay 137
7.4 Microorganisms in food webs 144
8 Changes to materials 146
8.1 Simple chemical reactions 146
8.2 Neutralisation 151
8.3 Investigating acids and alkalis 156
8.4 Detecting chemical reactions 165
9 Electricity 168
9.1 Flow of electricity 168
9.2 Electrical circuits 170
9.3 Measuring the flow of current 172
9.4 Conductors and insulators 174
9.5 Adding or removing components 176
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