must be processed‚ or "fixed" to be used by plants. Some fixation occurs in lightning strikes‚ but most fixation is done by free-living or symbiotic bacteria. These bacteria have an enzyme that combines gaseous nitrogen with hydrogen to produce ammonia‚ which is then further converted by the bacteria to make their own organic compounds. Conversion of N2 The conversion of nitrogen (N2) from the atmosphere into a form readily available to plants and hence to animals is an important step in the
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ICSE Class X Chapter 5 Hydrogen Chloride and Hydrochloric Acid Hydrogen chloride (HCl) : Formula : HCl Nature : Covalent. Molecular Mass : 36·5u [i.e. HCl = 1 + 35·5 = 36·5] Occurrence : (i) Present in gastric juices. (ii) Present in volcanic gases. Laboratory preparation of HCl gas : Hydrogen chloride gas is prepared in laboratory by heating conc. H2SO4 with NaCl. NaCl + H2SO4 Heat → NaCl + NaHSO4 Heat → NaHSO4 + HCl Sodium hydrogen sulphate Na2SO4 + HCl
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Title Laboratory Techniques and Measurements Purpose The purpose of this experiment is to determine mass‚ length‚ temperature‚ volume‚ and density of objects and liquids using common measuring devices and algebraic formulas. The metric system‚ the most common set of measurements used in science‚ which includes meters‚ liters‚ Celsius‚ and grams will be used. Procedure The following items were used within the experiment: (1) Metric ruler with centimeter (cm) and millimeter (mm)‚ (1)
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SECTION I (40 Marks) Attempt all questions from this Section Question 1 (a) Select from the list the gas that matches the description given in each case: [ammonia‚ ethane‚ hydrogen chloride‚ hydrogen sulphide‚ ethyne] (i) This gas is used as a reducing agent in reducing copper oxide to copper. (ii) This gas produces dense white fumes with ammonia gas. (iii) This gas is used for welding purposes. (iv) This gas is also a saturated hydrocarbon. (v) This gas has a characteristic rotten egg smell. [5]
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1.0 Title Determination of Protein Content Using Kjedahl and Titration 2.0 Introduction Proteins are polymers. They are the source of dietary amino acids and are used for growth and maintenance of living systems. They are costlier sources of energy compared to carbohydrates and fats and hence the human body utilizes proteins mainly for biosynthesis rather than as an energy source‚ though the energy yield is 5 kcal/g of protein. Twenty different types of amino acids occur naturally in proteins
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becomes Cu(H2O)4 SO4 - H2O where four water molecules are bound to the copper ion and the fifth is a water of crystallization. This compound absorbs light of wavelengths from 600 to 800nm (yellow-to-red region) light and blue light is transmitted. When ammonia is added to a solution of copper(II) cation‚ tetraamminecopper(II)
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incorporate the nitrogen from amino acids and proteins and release the excess nitrogen in the form of ammonium ions. The next part of this cycle is the oxidation of ammonium‚ also called nitrification. This step takes the nitrogen compound‚ in this case ammonia‚ and oxidizes it into nitrite and nitrate. This is a two step process first the ammonium is oxidized into nitrite and then the nitrite is oxidized into nitrate. Nitrite is toxic; therefore‚ nitrate is the form that almost all nitrogen is absorbed
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Discuss the critical elements of an effective and efficient stock control system for a continuous flow production line and how these elements can contribute to the profitability of McDonald’s business By Chan Tsunglin Introduction Business activities involves purchasing raw materials‚ semi-finished goods and components‚ changing them into finished goods or combined with services‚ and selling them to the customers. Before customers purchasing these finished goods and services‚ they are all hold
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Amino acids are a highly important class of molecules‚ which are the monomeric subunits of proteins‚ enzymes‚ and peptides in biological systems. Amino acids contain a carboxylic acid group‚ an amine group‚ and a unique side chain‚ which determines its properties. There are more than 500 amino acids; however‚ only 20 are commonly found1. Due to their importance in biological systems‚ it is important to be able to experimentally analyze and isolate amino acids by separation techniques. One such method
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20cmᶟ pipette ●Hydrated nickel(II) sulphate (NiSO₄.6H₂O) 100cmᶟ standard flask ●Standardised 0.10moll⁻¹ EDTA solution 250cmᶟ conical flask ●1 moll⁻¹ ammonium chloride Weighing bottle ●Murexide indicator Balance (accurate to 0.01g) ●0.88 aqueous ammonia 100cmᶟ beakers ●Deionised water 25cmᶟ measuring cylinder Wash bottle Pipette filler White tile Filter funnel Approximately 2.6g of hydrated nickel(II) sulphate was transferred to a weighing bottle and the contents weighed and about 25cmᶟ of
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