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A title that best describes a chemistry document could be: "Comprehensive Overview of Chemistry Principles and Applications" This title suggests a thorough exploration of various aspects of chemistry. If the document focuses on a specific area, yo $8.49   Add to cart

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A title that best describes a chemistry document could be: "Comprehensive Overview of Chemistry Principles and Applications" This title suggests a thorough exploration of various aspects of chemistry. If the document focuses on a specific area, yo

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  • August 28, 2024
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Chemistry
Senior One

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, © 2020 Rwanda Basic Education Board (REB)
All rights reserved.
This document is property of the government of Rwanda.
Credit should be given to REB when the content is quoted.

, Table of Content
Unit 1 Chemistry and society.......................................................... 1
Introduction........................................................................................ 1
1.1 Definition of Chemistry................................................................. 2
1.2 Importance of Chemistry............................................................... 3
1.3 Applications of Chemistry in Industry............................................. 4
1.4 Contribution of Chemistry to the economy of Rwanda.................... 7
Test Your Competence 1.................................................................... 9

Unit 2 Laboratory safety and apparatus......................................... 10
Introduction...................................................................................... 10
2.1 Definition of laboratory................................................................ 11
2.2: Laboratory safety........................................................................ 12
2.3 Laboratory apparatus................................................................... 19
Test Your Competence 2.................................................................. 33

Unit 3 States and changes of states of matter.................................. 34
3.1 Definition of matter and the states of matter.................................. 34
3.2 Changes of states of matter........................................................... 36
3.3 Physical and chemical changes of matter....................................... 38
3.4 Kinetic theory of matter............................................................... 46
Test Your Competence 3.................................................................. 55

Unit 4 Pure Substances and Mixtures............................................ 57
4.1 Pure substances........................................................................... 57
4.2 Mixtures...................................................................................... 58
4.3 Methods of separating mixtures.................................................... 60
Test Your Competence 4.................................................................. 76



iii

, Unit 5 Atoms, Elements and Compounds....................................... 78
5.1 Definition of element, atom and molecule..................................... 78
5.2 Symbols of chemical elements ..................................................... 79
5.3 Main components of an atom....................................................... 81
5.4 Atomic characteristics.................................................................. 82
5.5 Electronic configuration .............................................................. 83
5.6 Instability of atoms ...................................................................... 88
5.7 Radicals....................................................................................... 91
5.8 Valence of elements and radicals................................................... 91
5.9 Chemical formulae and nomenclature........................................... 91
Test Your Competence 5.................................................................. 95

Unit 6 Arrangement of elements in the Periodic Table...................... 97
6.1 Dobereiner’s triads ..................................................................... 98
6.2 Historical development of the modern Periodic Table.................... 99
6.3 The modern Periodic Table......................................................... 100
6.4 Relationship between electronic structures of elements and their
positions on the Periodic Table................................................... 101
6.5 Metallic and non-metallic trends in the Periodic Table................. 104
Test Your Competence 6.................................................................107

Unit 7 Water and its composition..................................................109
7.1 Sources of water......................................................................... 110
7.2 Physical properties of pure water................................................ 111
7.3 Testing for the presence of water in a given substance.................. 112
7.4 Characteristics of different categories of water............................. 113
7.5 Treatment and purification of water............................................ 114
7.6 Water cycle................................................................................. 116
7.7 Uses of water ............................................................................ 117
Test Your Competence 7.................................................................119

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