Experiment 1: The Effects of Coal Mining Coal mining‚ particularly surface mining‚ leads to large areas of land being temporarily disturbed. The mine workings collect and conduct water that is in contact with the widespread pyrite‚ a mineral that produces iron and sulfuric acid when exposed to air and water. In this lab‚ you will see first-hand the reasons why mine drainage can be harmful to the local drainage system if left untreated. Materials: (3) 100 mL Beakers 1 tsp. Crushed pyrite 1 tsp. Activated
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EXPERIMENT 3 DETERMINATION OF ORGANIC MATTER BY WALKEY- BLACK WET OXIDATION METHOD OBJECTIVE: This method determines the percentage of organic carbon and organic matter in the soil. INTRODUCTION The soil sample is suspended in standard potassium dichromate (K2Cr2O7) solution to which concentrated sulphuric acid is then added. The heat generated on adding the sulphuric acid and the presence of chromic acid creates strong oxidizing conditions. The excess chromic
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9.5 Tests for halogens and halide Ions Test for halogen Test method Test observations Test chemistry and comments Chlorine gas Cl2 A pungent green gas. (i) Apply damp blue litmus. (Can use red litmus and just see bleaching effect.) (ii) A drop silver nitrate on the end of a glass rod into the gas. (i) litmus turns red and then is bleached white. (ii) White precipitate. (i) Non-metal‚ is acid in aqueous solution and a powerful oxidising agent (ii) It forms a small amount of chloride ion in water
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CBSE Class IX Term I Summative assessment I Sample paper 3 SECTION A 1. Breathing on a mirror turns mirror foggy‚ what phenomenon is responsible for this? [1] 2. What is the major function of cell wall in plant cell? [1] 3. When a carpet is beaten with a stick‚ dirt comes out of it. Why? [1] 4. (a) Name the two factors on which the buoyant force depends. [2] (b) State the relationship between the buoyant force on an object and weight of the liquid displaced by it. 5. State any two reasons for
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Here is cbse 2007 question paper of science: CBSE X SCIENCE AND TECHNOLOGY (Theory) 2007 (OUTSIDE DELHI) Time allowed: 2 hours 15 mins; Maximum Marks: 100 General Instructions: | 1) | The question paper comprises of two sections A and B. You are to attempt both sections. | 2) | You are advised to attempt all the questions of Section A and Section B separately. | 3) | All questions are compulsory. | 4) | There is no overall choice. However‚ internal choice has been provided in some questions
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Table 8.1- Combustion of magnesium ribbon Observations Reaction was exothermic; magnesium ribbon burned and was glowing a bright white color when ignited. Reactants: Mg and O2 Products: MgO Balanced chemical equation 2Mg + O2 2MgO Table 8.2- Combustion of heptane Observations When holding test tube inverted over heptane flame‚ condensation formed against top walls of the test tube. When the burning splint was added the walls of the test tube became less foggy from the condensation
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Monosodium glutamate (MSG) and salt have a lot in common‚ including a similar appearance. Both consist of white crystals that can differ in size and both may show up in the same types of dishes. Their similarities do not mean that they are exactly the same or that you can use them interchangeably. In this SPICEOgraphy Showdown‚ we will take a look at how MSG and salt compare to each other. How do MSG and salt differ? MSG is one of many different forms of salt used in cooking. Other forms include
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With my test result‚ it clearly shows that the concentration of sulfuric acid is 0.05 mol/dm3 using the concentration equation‚ c= n/v. 25 cm3 of the volume with sodium hydroxide is equal to 0.025 dm3 by dividing a thousand with cm 3 and multiply it with 0.1 mol/ dm3 which is the concentration of sodium hydroxide. With the ratio between sulfuric acid and sodium hydroxide is 1 to 2 so‚ 0.0025 should be divided by 2 and 0.00125 moles of sulfuric acid is come out. Finally‚ using c = m/v‚ 0.00125 mole/0
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This paper argues on both theoretical and empirical grounds that‚ beyond a certain point‚ there is an unavoidable conflictbetween economic development (generally taken to mean ’materialeconomic growth’) and environmental protection. Think for a moment of natural forests‚ grasslands‚ marine estuaries‚ salt marshes‚ and coral reefs; and of arable soils‚ aquifers‚ mineraldeposits‚ petroleum‚ and coal. These are all forms of ’natural capital’ that represent highly-ordered self-producing ecosystemsor
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gas called sulfur dioxide or SO2 for short. This toxic component is found in products made of plastic and certain preservatives found on dried fruits and nuts. Sulfur Dioxide as a vapor is released into the air then falls to the ground in the rain. This is known as acid rain. Acid rain has two indirect effects on our ecosystems. The first‚ acid rain slowly destroys our forests and plant-life. When acid rain falls‚ it seeps into the soil around trees and plants. Over time‚ the sulfur dioxide dissolves
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