Ans.The substance X is lime which is used for white washing. Its formula is CaO. (ii) Write the reaction of the substance X named in (i) above with water. Ans: CaO + H2O → Ca(OH)2 + Heat Q.5. Why is the amount of gas collected in one of the test tubes in Activity 1.7‚ double of the amount collected in the other ? Name this gas. Ans: water contains two parts of hydrogen and one part oxygen. Therefore‚ during
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STERILIZATION OF WATER USING BLEACHING POWDER A CHEMISTRY INVESTIGATORY PROGECT ANSHUL KUMAR PANDEY XII B [THIS PROJECT LOOKS AT THE TECHNIQUE CALLED STERILIZATION OF WATER USING BLEACHING POWDER WHICH IS USED TO PURIFY WATER AND MAKES IT FIT FOR DRINKING.] Downloaded from www.icbse.com INDEX 1. Certificate of Authenticity 2. Acknowledgement 3. Introduction -Need of Water -Purification of Water -Need for a stable purification technique 4. Theory -History of Water purification -Bleaching
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The Rate of a Reaction The area of chemistry that deals with the rate or speed of chemical reactions is known a chemical kinetics. The word “kinetic” is derived from the Greek name kinitikos that means movement or motion. In the present context‚ the kinetic means the reaction rate or rate of a reaction that is defined as the change in concentration of a reactant or a product with time (M/s). Chemical reaction can be represented by the following general equation. Reactants Products It is very important
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HKDSE CHEMISTRY – A Modern View (Chemistry) Coursebook 3 Suggested answers Chapter 25 Simple molecular substances with non-octet structures and shapes of simple molecules Page Number Class Practice 1 Chapter Exercise 2 Chapter 26 Bond polarity Class Practice 4 Chapter Exercise 5 Chapter 27 Intermolecular forces Class Practice 7 Chapter Exercise 9 Chapter 28 Structures and properties of molecular crystals Class Practice 11 Chapter Exercise 12 Part Exercise 14 Chapter 29 Chemical cells in daily life
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Research Task: Metals By Megan Forbes 1. Gold Figure 1 Evidence of gold mines: Ancient Egyptian map showing roads to Nubian gold mines‚ dated 1400-1200 BC (Located in the Egyptian Museum in Turin‚ Italy) Figure 1 Evidence of gold mines: Ancient Egyptian map showing roads to Nubian gold mines‚ dated 1400-1200 BC (Located in the Egyptian Museum in Turin‚ Italy) Figure 2 Ancient Egyptian hieroglyphs depicting gold Figure 2 Ancient Egyptian hieroglyphs depicting gold i) Gold was no
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are both different types of the physical form of Carbon. Diamond Structure: Giant covalent lattice of carbon atoms. Each Carbon atom is bonded to 4 others which tetrahedrally surround the atom. They have a high melting point as a large amount of heat energy is needed to break their bonds. They are unable to conduct electricity as they have no free mobile electrons to carry the current. Diamond is very hard as there are many bonds within the substance. It is the hardest natural substance and is
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Study material CHEMISTRY CLASS: XII KENDRIYA VIDYALAYA SANGATHAN LUCKNOW R E G I O N 2009-2010 Study Material Class XII -Chemistry SHRI RANGLAL JAMUDA IAS‚COMMISSIONER CHIEF Patron KENDRIYA VIDYALAYA SANGTHAN NEW DEHLI SHRI M.S Chauhan Asst. Commissioner Patron Kendriya Vidyalaya Sangthan Lucknow Region SHRI S.S. Rawat Guidance Smt. A.N Siddiqui (Education officer) (Education officer) SHrI K.‚M. Bhatnagar (Education officer) Co-ordinator SHRI. T. Singh Principal K.V. No. 2
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WORKSHEET MOLE By Sir Shah Murtaza Q1. Potassium reacts with water as shown in the equation. a. Describe what you would see when potassium reacts with water. b. A sample of 0.195 g of potassium was added to 500 cm3 of cold water. When the reaction was finished‚ 100 cm3 of 0.100mol/dm3 hydrochloric acid was added to form solution X. (i) Calculate the number of moles of hydroxide ions formed when the potassium was added to water. (ii) Calculate the
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TERM PAPER [GEOCHEMISTRY OF NATURAL WATERS] Weathering Reaction In Rocky Mountains Thursday‚ December 6th‚ 2012 BIOL-4060 Abstract: Our planet continues to be influenced by geological processes which help make the way look it is today‚ some of these account for weathering. Weathering is essentially the breakdown of rocks‚ soils and minerals in water and land through interaction with the Earth’s atmosphere. Weathering occurs by means of two processes‚ physical and chemical. Chemical
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http://www.kewpid.com 1. Fossil fuels provide both energy and raw materials such as ethylene‚ for the production of other substances 1) Construct word and balanced chemical equations of chemical reactions as they are encountered • Methane + oxygen carbon dioxide + water • CH4(g) + 2O2(g) CO2(g) + 2H2O(l) 2) Identify the industrial source of ethylene from the cracking of some of the fractions from refining of petroleum Generally‚ demand for petrol exceeds supply produced from fractional distillation
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