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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TITLE PAGE PREPARATION AND CHARACTERIZATION OF SODIUM SALICYLATE OINTMENT INTENDED FOR TOPICAL AND SYSTEMIC DELIVERY BY MUOBIKE MAKUO 2005/136609 IN PARTIAL FULFILLMENT OF THE REQUIREMENT FOR THE AWARD OF DEGREE OF BACHELOR OF PHARMACY (B. PHARM) OF THE UNIVERSITY OF NIGERIA‚ NSUKKA. DEPARTMENT OF PHARMACEUTICAL TECHNOLOGY FACULTY OF PHARMACEUTICAL SCIENCES UNIVERSITY OF NIGERIA‚ NSUKKA. PROJECT SUPERVISOR: DR. I. V. ONYISHI OCTOBER‚ 2012. APPROVAL PAGE This is to certify
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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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LECTERUR : EXPERIMENT 4 DETERMINING MOLECULE WEIGHT BY FREEZING POINT DEPRESSION METHOD STUDENT NAME : ID : LAB PARTNERS | | INTRODUCTION According to Anne‚ n.d‚ the freezing point of a liquid is decreased by adding to another compound to it. This is known as freezing point depression. The pure solvent will have higher freezing point than the solution. Colligative property of matter can explain more about freezing point depression. Whereas‚ colligative properties depends on the number
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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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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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procedure by inserting the ice cube into the beaker filled with vegetable oil‚ the dullness and boring state also began to flow. We sat there watching for a good five minutes before any visual reaction was taking place. The ice cube was actually melting in the oil; however‚ the water‚ representing a simple start for the procedure‚ was not mixing with oil. This aroused us with many questions and observations such as “Why is the water not mixing with the oil?” and “Does It have anything to do with
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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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