Chemistry 9th Class Chapter No. 1 (Fundamentals of Chemistry) Notes PDF Download

Chapter no. 1: Fundamentals of Chemistry
The knowledge that provides understanding of this world and how it works, is science. The branch of science which deals with the composition, structure, properties and reactions of matter is called chemistry. It deals with every aspect of our life. The development of science and technology has provided us a lot of facilities in daily life. Imagine the role and importance of petrochemical products, medicines and drugs, soap, detergents, paper, plastics, paints and pigments, insecticides, pesticides which all are fruit of the efforts of chemists. The development of chemical industry has also generated toxic wastes, contaminated water and polluted air around us. On the other hand, chemistry also provides knowledge and techniques to improve our health and environment and to explore and to conserve the natural resources. In this chapter, we will study about different branches of chemistry, basic definitions and concepts of chemistry.
Major Concepts
1.1 Branches of Chemistry
1.2 Basic Definitions
1.3 Chemical species
1.4 Avogadro' s Number and Mole
1.5 Chemical Calculations

Students Learning Outcomes
Students will be able to:
• Identify and provide examples of different branches of chemistry.
• Differentiate among branches of chemistry.
• Distinguish between matter and a substance.
• Define ions, molecular ions, formula units and free radicals.
• Define atomic number, atomic mass, atomic mass unit.
• Differentiate among elements, compounds and mixtures.
• Define relative atomic mass based on C-12 scale.
• Differentiate between empirical and molecular formula.
• Distinguish between atoms and ions.
• Differentiate between molecules and molecular ions.
• Distinguish between ion and free radicals.
• Classify the chemical species from given examples.
• Identify the representative particles of elements and compounds.
• Relate gram atomic mass, gram molecular mass and gram formula mass to mole.
• Describe how Avogadro's number is related to a mole of any substance.
• Distinguish among the terms gram atomic mass, gram molecular mass and gram formula mass.
• Change atomic mass, molecular mass and formula mass into gram atomic mass, gram molecular mass and gram formula mass.

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