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Class 09 Atoms and Molecules Numerical Problem based on Law of chemical Combination Law of conservation of mass Law of constant proportion Empirical formula 1. If 10 grams of CaCO 3 on heating gave 4.4g of CO 2 and 5.6g of CaO, show that these observations are in agreement with the law of conservation of mass.(Based on Law of conservation of mass) Solution:  Mass of the reactants = 10g ;  Mass of the products = 4.4 + 6.6g = 10g Since the mass of the reactants is equal to the mass of the products, the observations are in agreement with the law of conservation of mass. 2. 1.375 g of cupric oxide was reduced by heating and the weight of copper that remained was 1.098g.  In another experiment 1.179 g of copper was dissolved in nitric acid and the resulting copper nitrate was converted into cupric oxide by ignition . The weight of cupric oxide formed was 1.476 g. which law of chemical combinations does this data state? Solution: in first experiment: Copper oxide = 1.375g ;   Coppe

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CBSE TEST PAPER-01  SCIENCE & TECHNOLOGY  (Class-10) Chapter 6 : Life Process 1 . What are the raw materials for photosynthesis? (1 mark) Answer: The raw materials and other necessary items required for photosynthesis are Sunlight, Water, CO 2 and Chlorophyll. 2. What is the role of bile juice in digestion? (1 mark) Answer: Bile is alkaline in nature and it is temporarily stored in gallbladder  and helps in digestion of fats,   it also helps in absorption fats. 3. Write the equation for respiration? (1 mark) Answer: C 6 H 12 O 6   --- > C 3 H4O 3   ----->   6CO2 +  6H2O +  38ATP 4. Name three types of blood vessels used in the transport of blood. (1 mark) Answer: Arteries, vein and capillaries Note: There are three major types of blood vessels: the arteries, which carry the blood away from the heart; the capillaries, which enable the actual exchange of water and chemicals between the blood and the tissues; and the veins, which carry blood from the

Life processes – The processes that are necessary for an organism to stay alive. Eg. Nutrition, respiration, etc. Criteria of life - (i) Growth  (ii) Movement Nutrition - The process of taking  in food and its utilizes it to get energy, for growth, repair and maintenance, etc. and excretes the waste materials from the body is called Nutrition. Types of nutrition 1. Autotrophic nutrition (Auto =self:  trophos = nourishment) E.g. Plants, Algae, blue green bacteria. Process – Photosynthesis (Photo=light; Synthesis= to combine) Raw materials- (i) Carbon dioxide (ii)Water Chlorophyll Formula :  C55H72O5N4Mg Equation-     6CO 2   +  6H 2 O              sunlight /     Chlorophyl   ----->      C 6 H 12 O 6      +     6O 2 Energy conversion- Light/Solar energy to Chemical energ Role off Chlorophyll- To trap the sun’s energy for photosynthesis Factors- (i) Carbon dioxide (ii) Water(iii) Light (iv) Temperature Events/ Steps of photosynthesis-   (i) Absorption of light energy by chlorophyll