Weigh out your 1.0g of CaCl2-2H20 and put it into the 100mL beaker‚ add your 25mL of distilled water and stir to form the calcium chloride solution. Next‚ use stoichiometry to determine how much Na2CO3 and put it into a small paper cup. Then add the 25mL of distilled water to make the sodium carbonate solution. Mix the two solutions in the beaker and a precipitate of calcium carbonate will form instantly. Next‚ set up your filtration assembly. After the filtration assembly is ready‚ swirl the contents
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‘Kinetics’ is the study of chemical reactions. The speed of a reaction can vary depending on many variables such as the nature of the reactants‚ particle size‚ concentration and temperature. For a chemical reaction to occur‚ there must be a collision between reactants. The reaction rate is slower when the reactants are large and complex molecules because it takes longer for the molecules to combine together creating a chemical reaction. More than 2000 years ago‚ Democritus‚ who was a philosopher
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precipitate reaction happens when cations and anions of certain aqueous solutions react and combine forming a precipitate‚ which is an insoluble ionic solid. In this precipitate reaction we dissolved both chosen chemicals (powder Calcium Chloride dihydrate and powder Sodium Carbonate) in distilled water and then mixed them together in a single beaker. Finally we filtered this mixture and let all the water evaporate leaving behind solely the precipitate. In order to determine the amounts needed of each reactant
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neutralize stomach acid. They are used to relieve acid indigestion‚ upset stomach‚ sour stomach‚ and heartburn. Antacids are taken by mouth and work by neutralizing excess stomach acid. They contain ingredients such as aluminum hydroxide‚ calcium carbonate‚ magnesium hydroxide‚ and sodium bicarbonate‚ alone or in various combinations. Antacid products may also contain other ingredients such as simethicone‚ which relieves gas. Antacids differ in how quickly they work and how long they
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Amazon river. Pearls chemical composition are mainly calcium carbonate (about 82%-86%)‚ conchiolin and 2-4% of water (CaCO3 and H2O). Pearls are sensitive to heat and chemical materials. The bivalve of oysters are the best source for growing pearls. A good stimulus (usually a sand particle) is necessary for pearls production. The stimulus will place inside the oyster or mollusk‚ and oyster ’s defense mechanism starts secreting a calcium carbonate coating material to coat the irritate. Layer upon
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CHEMICAL COMPOUNDS “Analytical chemistry -I” http://foricseandbeyond.blogspot.in/ metal oxide “Oxides of metals are generally stable to heat and they are considered to be most stable form of compound found in nature.” Oxides of potassium‚sodium‚calcium‚magnesium‚ aluminum ‚ zinc‚iron‚lead and copper are stable to heat uO C PbO Zn O http://foricseandbeyond.blogspot.in/ MERCURIC OXIDE “Mercury(II)oxide” “orange red” 2HgO 2Hg + O2 1.The amorphous powder changes to dark
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dish and Na2CO3 _1.2_g Net mass of the Na2CO3 _0.7__g Step 6: Mass of filter paper _1.0_g Step 10: Mass of filter paper and dry calcium carbonate __1.5_g Net mass of the dry calcium carbonate __0.5__g (This is the actual yield) Step 11: Show the calculation of the theoretical yield of calcium carbonate. 0.00680 moles CaCO3 x 100 g CaCO3 1 mole CaCO3 = 0.68g CaCO3 Show the calculation of the percent yield. Actual yield/Theoretical yield x 100
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2. = time interval over which the change in concentration was measured. *.For gases; *.Where; 1. = change in volume of the gas produced or consumed during the reaction Volume‚ V‚ of carbon dioxide evolved at time t in the reaction between calcium carbonate and hydrochloric acid t/s 0. 0 10. 0 20. 0 30. 0 40. 0 50. 0 60. 0 70. 0 80. 0 90. 0 10 0.0 V(C O₂) cm³ 0. 0 19. 0 30. 0 37. 5 45. 0 50. 0 52. 0 53. 0 53. 0 53. 0 53. 0 * * Instantaneous Rate INITIAL RATE * *When
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NSS Chemistry Part 3 Metals HKCEE Past Paper Questions – Structural Questions 1. HKCEE 1995 Q1 Rubidium (Rb) and potassium belong to the same group in the Periodic Table. The relative atomic mass of rubidium is larger then that of potassium. (a) Explain whether rubidium is more reactive than potassium. (b) Write a chemical equation for the reaction between rubidium and water. (State symbols should be given.) (c) Suggest how rubidium can be stored safely in the laboratory.
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Catalytic converter which achieve high rate of reaction by using a platinum catalyst‚ heterogeneous reactions and very high temperatures Thermal exhaust reactor takes advantage of heat of reactors 2 CO + O2 2 CO2 Oxides of nitrogen Electrical storm Decomposition of organic matter containing nitrogen Combustion of fossil fuels at high temperatures Combustion of nitrogen and oxygen at high temperature inside an internal combustion engine Lung irritant Irritates eyes HNO3 aerosols Lean-burn engine Recirculation
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