70 14 73 15 40 16 79 17 80 18 84 12 45 48 51 52 55 56 59 59 64 65 75 K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton 24 96 25 31 115 32 119 33 122 34 128 35 127
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Kassandra Coan Why put lime in a pond? Honors Activity 5.4 Lime is a commercial name for calcium oxide (CaO). When carbon dioxide (Co2) is removed from limestone‚ coral‚ seashells‚ or chalk they become lime. This product is easily accessible‚ because an abundance of limestone in found in the crust of the earth‚ and the Co2 is removed simply by heating the limestone. See formula below: 500-600
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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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of soda ash. BACKGROUND Sodium carbonate is an important industrial chemical. It is used in the manufacture of soap‚ glass‚ paper and as a source of alkalinity‚ that is‚ as a base. About half the sodium carbonate used in the United States is manufactured by the Solvay process. In this process‚ which is carried out at 0 °C‚ carbon dioxide is bubbled through a concentrated sodium chloride solution which is saturated with ammonia. Sodium hydrogen carbonate precipitates from the solution and
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Chemistry 108/lab Section C2A Fall 2014 Amee Karelia Date of experiment: 9/16/2014 Date of submission: 9/23/2014 Experiment # 3 Purpose: the purpose of this experiment was to explore the distinctions between physical and chemical properties and between physical and chemical changes. Lab questions: 1. Based on my observation CaCl2 is soluble in water. 2. When 15% of HCl was added to CaCl2 as the teacher was performing the experiment I observed and realized some changes took place physically
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Salts Nitrate salts Carbonate salts Chloride salts Soluble All nitrate salts Potassium carbonate‚ K2CO3 Ammonium carbonate‚ (NH4)2CO3 Sodium carbonate‚ Na2CO3 All chloride salts Except Sulphate salts All sulphate salts Except 2. Preparation and purification of soluble salts Lead (II) chloride‚ PbCl2 Silver chloride‚ AgCl Mercury Chloride‚ HgCl Lead (II) sulphate‚ PbSO4 Barium sulphate‚ BaSO4 Cacium sulphate‚ CaSO4 Persatuan Bahasa Cina Pb Ag Hg P A S All other carbonate salts Insoluble i
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oil – for skin inflammation to left leg (for a week) Past History: Smokes ½ a pack of cigarettes per day (since she was a teenager) Weight: 70 kg Height: 150 cm DOCTOR’S ORDER: Medications: Ancef 750 mg IV q12h Elavil 50 mg po qhs Calcium Carbonate 1000 mg po once daily Vit D 1000 units po once daily Actonel 35 mg/week po Vagifem 10mcg tablet into the vagina qhs Imitrex 75 mg po q4h prn for a maximum of 2 doses daily Metformin 750 mg po TID with meals Buffered Aspirin 650 mg po q6h
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of carbonate due to the chemical reactions we have studied and drawn up. The problem with taking these very important ions out of the water is that they are one of the two compounds that calcifiers‚ very small organisms‚ need to survive. Calcifiers‚ which are the base of pretty much every coral reef on the planet‚ need to make shells which is part of their colonies skeleton. This leaves a decision for calcifiers to make: should I expend more energy capturing the decreasing amount of carbonate ions
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Glucose‚ as a product is used to make energy for growth. Lastly‚ the oxygen is a waste product in this chemical reaction‚ which become part of the Earth’s atmosphere. At this experiment‚ carbon dioxide and water were replaced by ‘Sodium hydrogen carbonate’ because this led to simpler procedures than using carbon dioxide and water separately. During photosynthesis‚ leaves only accept certain wavelength of light. For instance‚ most of leaves reflects radiation and receive blue and red colours.
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STEWARDSHIP INFORMATION SERIES Hardness in Groundwater February 2007 What is water hardness? Water hardness is primarily the amount of calcium and magnesium‚ and to a lesser extent‚ iron in the water. Water hardness is measured by adding up the concentrations of calcium‚ magnesium and converting this value to an equivalent concentration of calcium carbonate (CaCO 3 ) in milligrams per litre (mg/L) of water. The Guidelines for Canadian Drinking Water Quality Hardness divide hardness into
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