1 Model Question Paper Basic Engineering and Sciences The material in which spontaneous polarization changes with temperature is known as (1) Piezo electric (2) Ferro electric (3) Pyro electric (4) Magneto optic Where K and s are thermal and electrical conductivities in a solid‚ according to Wiedemann Franz law 1. The theorem used for equilibrium of concurrent 8. coplanar forces is (1) Varignon’s Theorem (2) Lame’s Theorem (3) Parallel Axis Theorem
Free Thermodynamics Temperature
metal is). The more reactive the metal‚ the more difficult it is to extract. Thus electrolysis would be used more the more reactive and the “Blast Furnace” for the less: Metal Method of Extraction Potassium Electrolysis Sodium Electrolysis Calcium Electrolysis Magnesium Electrolysis Aluminium Electrolysis Zinc Heat with C or CO Iron Heat with C or CO Lead Heat with C or CO Copper Roasting in air Silver Occur naturally Gold Occur naturally Out of all the methods‚ native
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Synopsis The objective of this experiment is to determine the percentage by mass of calcium carbonate‚CaCO3 in toothpaste using back titration technique. A known weight portion of toothpaste is obtained to react with known volume and concentration of standard acid solution. After completing the reaction‚ the resulting solution containing excess acid is back titrated with known volume and concentration of standard base solution. Determination of excess acid after reaction allow us to calculate the
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experiment‚ the online simulation was used to determine which substances were endothermic or exothermic when dissolved in water. According to the simulation‚ sodium chloride and ammonium chloride was observed to be endothermic. Calcium chloride‚ sodium acetate‚ sodium carbonate‚ and lithium chloride was observed to be exothermic. As sodium chloride and ammonium chloride was observed to be endothermic‚ those two salt substrates was not used in the experiment as the goal of the experiment was to increase
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Bacteria and Toothpaste: The Effect of Toothpaste on Bacteria Table of Contents Page 1: Title Page Page 2: Table of Contents Page 3: Introduction Page 4 – 6: Research Page 7 – 10: Lab Report Page 11: Conclusion Page 12: References Bacteria and Toothpaste: The Effect of Toothpaste on Bacteria My project is on Toothpaste and Bacteria‚ and how bacteria is effected by toothpaste. I found this project very interesting because it was an opportunity
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Bellamar Caves are a National Monument that is located in Matanzas‚ Cuba‚ they are a set of cave with more than 23 kilometers of galleries. By the beauty of its gallery and caves‚ they were declared a National Monument. The galleries and passages of the cave started forming about 300 thousand years ago. According to the studies the caves were originally under the sea‚ part of the bat of Matanzas. While they were under sea level‚ these caves were full of water. The tectonic movements caused the area
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April-May ranges from 36~42°C arid mean minimum temperature during winter ranges from 15-24° centigrade. Semi-arid to sub-humid‚ tropical to sub-tropical monsoon type climate with alternate dry and wet periods and calcification (formation of calcium carbonate) are favourable to the formation of black soils. The soils are characterised by dark grey to black colour with 35-60% clay‚ neutral to slightly alkaline reaction‚ high swelling and shrinkage‚ plasticity‚ deep cracks during summer and poor status
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except; PbCl2 - lead(II) chloride (dissolve in hot water) AgCl - argentums/silver chloride HgCl - hydroargentum chloride‚ mercury chloride Sulphate All sulphate salt dissolve in water except; PbSO4 ‚ BaSO4 ‚ CaSO4 Carbonate All carbonate salt not dissolve in water except; Li2CO3 Na2CO3 ‚ K2CO3 ‚ (NH4)2CO3 Oxide All oxide not dissolve in water except; Na2O ‚ K2O ‚ CaO Hydroxide All hydroxide not dissolve in water except; NaOH‚ KOH‚ Ca(OH)2 ‚ Ba(OH)2 Formula to
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water and then with the alkali. Rinse with tap water and then with distilled water. Rinse with tap water and then with the acid. Rinse with the alkali. The labels fell off two bottles each containing a colourless solution‚ one of which was sodium carbonate solution and the other was sodium chloride solution. The addition of which solution to a sample from each bottle would most readily enable the bottles to be correctly relabelled? A B C D ammonia hydrochloric acid lead(II) nitrate sodium hydroxide
Free Oxygen Oxide Chlorine
by reacting sodium hydroxide with impure potassium. Potassium hydroxide is usually sold as translucent pellets‚ which will become tacky in air because KOH is hygroscopic. Consequently‚ KOH typically contains varying amounts of water (as well as carbonates; see below). Its dissolution in water is strongly exothermic‚ meaning the process gives off significant heat. Concentrated aqueous solutions are sometimes called potassium lyes. Even at high temperatures‚ solid KOH does not dehydrate readily. Other
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