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SCIENCE (52) CHEMISTRY SCIENCE Paper - 2 Aims: 3) To acquire skills in proper handling of apparatus and chemicals. 1) To acquire the knowledge of terms, concepts, processes, techniques and principles related to the subject. 4) To develop scientific temper, attitude and problem solving skills. 2) To develop the ability to apply the knowledge of contents and principles of chemistry in unfamiliar situations. 5) To recognize Chemical Science as having an important impact on the environment relating to cycles in nature; natural resources, pollution. CLASS IX There will be one paper of two hours duration of 80 marks and Internal Assessment of practical work carrying 20 marks. The paper will be divided into two sections, Section I (40 marks) and Section II (40 marks). Section I (compulsory) will contain short answer questions on the entire syllabus. (ii) Relative Atomic Masses (atomic weights) and Relative Molecular Masses (molecular weights): either - standard H atom or 1/12th of carbon 12 atom. Definitions Calculation of Relative Molecular Mass and percentage composition of a compound. Section II will contain six questions. Candidates will be required to answer any four of these six questions. Note: All chemical reactions should be studied with reference to the reactants, products, conditions, observations and the (balanced) equations. 1. The Language of Chemistry 2. Chemical changes and reactions (i) Symbol of an element; valency; formulae of radicals and formulae of compounds. Balancing of simple chemical equations. Symbol definition; symbols of the elements used often. Valency definition; hydrogen combination and number of valence electrons of the metals and non-metals; mono, di, tri and tetra valent elements. Chemical equation definition and examples of chemical equations with one reactant and two or three products, two reactants and one product, two reactants and two products and two reactants and three or four products; balancing of equations. (by hit and trial method). (i) Types of chemical changes. Direct combination Decomposition Displacement; Double decomposition (The above to be taught with suitable chemical equations as examples). (ii) Energy changes in a chemical change. Radicals definition; formulae and valencies Exothermic and endothermic reactions with examples evolution/absorption of heat, light and electricity. Compounds name and formulae. 90
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