Unit 9
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9.1 Common acids and alkalis

9.2 Acid-alkali indicators and pH scale

9.3 Neutralization

9.4 Corrosive nature of acids

9.5 Potential hazards related to the use of acids and alkalis

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Unit 10
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10.1 Senses and sense organs

10.2 Sight

10.3 Hearing

10.4 Smell and taste

10.5 Touch

10.6 Sense of balance

10.7 The brain and our senses

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Unit 11
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11.1 Motion

11.2 Force

11.3 Gravity

11.4 Friction and air resistance

11.5 Action and reaction

11.6 Space flight

Unit end