Physics Facts & TriviaA rubber band shrinks when heated and expands when cooled because of the change in its Entropy state.Submitted by: Emily (Awesome) - Helena‚ Montana‚ United StatesDue to the effect of Thermal Expansion‚ the Eiffel Tower is upto 15cm taller in summer.Submitted by: Muhaimin Mareum Khan - Dhaka‚ BangladeshRadar is an abbreviation ofRadio Detection And Ranging.Submitted by: Marvin Jadulos - PhilippinesIf an atom were the size of a stadium‚ its electrons would be as small as
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Regents Chemistry Quarter 1 Midterm Review 1. The percent by mass of oxygen in Na2SO4 (formula mass = 142) is closest to 1) 11% 3) 45% 2) 22% 4) 64% 2. Given the unbalanced equation: __Al(s) + __O2(g) → __Al2O3(s) 3. 4. 5. 6. 7. balance the equation using smallest whole number coefficients. The percent by mass of aluminum in Al2O3 is approximately 1) 18.9 3) 47.1 2) 35.4 4) 52.9 What is the approximate percent composition by mass of CaBr2 (formula mass = 200)
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used to measure temperature. The extremely fine tube (narrow bore) of a thermometer is called a capillary. The boiling point of water (or condensing point of steam) is 100oC or 212oF or 373 K. The freezing point of water (or melting point of ice) is 0oC or 32oF or 273 K. These temperatures are typically used in the calibration of thermometers and are known as the fixed points. The temperature range that is typically marked on a laboratory thermometer is −10oC to 110oC. Thermometric liquids are
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container’s ice has been half melted. To keep this experiment valid I will keep the amount of ice‚ the time‚ and the amount of materials the same. In my experiment I will test to see what materials will change the ice to its freezing point depression state where it will be melting and there will be ice surrounded by water it just melted off. A few more scientific concepts that relate to this are the Freezing
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advantages of the one pierce mold casting include simplicity‚ low cost‚ and no seam lines in finished patterns. As with all manufacturing methods there some disadvantages to casting that include it can only be used with non-ferrous metals that has low melting temperature and long cooling time. As for the material used which consisted of a silicone mold making rubber and a special chemical composition (catalyst) with a usage ratio of 10 to 1. The calculate amount used for the silicone rubber was 918 g
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Acetone has a molar mass of 58.1 g mol-1 and a density of 0.787 g cm-3. Chloroform has a molar mass of 119.4 g mol-1 and a density of 1.499 g cm-3. Estimate the volume of the above mixture using this information. 3. Calculate the molal freezing point depression constant Kf for 1-octadecanol using: Tf = 57.95 oC‚ Hfus = 74.047 kJ mol-1‚ and M = 270.5 g mol-1. ΔTf = Kf m 4. A polymer chemist dissolves 20.00g of polystyrene in 1.000L of benzene. The solution is found to generate an osmotic
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find the quality of NaCl as a deicer. These experiments included testing the freezing point depression of NaCl in solution at two different concentrations‚ testing for the H of an aqueous NaCl solution‚ and combining NaCl with MgCl2 in an aqueous solution to test for freezing point depression. Through these various experiments we found NaCl to be the best deicer for our region due to its proficient freezing point depression and its cost efficiency. Introduction As scientists we were given the
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proves Explanation 3 true because it states that the high conductivity of the aluminium compared to the plastic is why the ice melts so fast on it. This evidence isn’t so obvious to some‚ who think that there is a different explanation to the ice melting faster on block a than block b. Some believe that the ice melts faster on block a because the aluminum absorbs the cold of the ice. According to the Molecular Kinetic Theory of Matter‚ “The motion of the particles that make up an object decreases
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CHEM 3411‚ Fall 2010 Solution Set 5 In this solution set‚ an underline is used to show the last significant digit of numbers. For instance in x = 2.51693 the 2‚5‚1‚ and 6 are all significant. Digits to the right of the underlined digit‚ the 9 & 3 in the example‚ are not significant and would be rounded off at the end of calculations. Carrying these extra digits for intermediate values in calculations reduces rounding errors and ensures we get the same answer regardless of the order of arithmetic
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grey cast iron gives the material good resistance to wear and also provides good corrosion resistance and lubrication characteristics which gives it exceptional machinability. The Carbon also provides good strength and toughness and has a high melting point which allows it to handle more heat under intense driving conditions. The composition of the grey cast iron is 3.5% carbon‚ 2.5% silicon and .65% manganese. Cast Iron engine blocks are still very common to this day in larger vehicles such as trucks
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