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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key concepts in this experiment is the term freezing point depression. The definition of this phrase is that when a solute is dissolved into a solvent‚ their collective boiling point will be less than that of the original boiling point of the solvent. This incidentally leads to another important definition‚ the colligative properties of a solution. This means a particular set of characteristics that are unique to that solution. As the freezing point of the solution decreases‚ the solution then attains
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Do you like salt? Do you put it on your food to make it taste better? Salt doesn’t just make food taste better; it can change the freezing and boiling point of water. I bet you didn’t know that! There’s a reason for that‚ but I’ll explain that a little later. First‚ let’s find out if salt can actually change the freezing and boiling point of water. To do so‚ we need to do an experiment. Now‚ if you’re going to do an experiment‚ you’re going to need a hypothesis. Let’s use mine. I said “if we
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The earth has not always looked the way it looks today. In other words‚ the United States one billion years ago was in a totally different location than it is today!! How does this happen? And why does this happen? Let’s take a look. In order for us to get some understanding of how the earth has changed over time‚ we first need to understand some of the things that took place‚ and are still taking place‚ in the earth. What about the internal structure of the Earth? Our best clues about the interior
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CHM113 summer 2014 Name: __________________________ EXAM 4 SHOW YOUR WORK 1) Of the molecules below‚ the bond in __________ is the least polar. A) HBr B) HI C) HCl D) HF E) H2 2) Ethanol (C2H5OH) melts at -114°C. The enthalpy of fusion is 5.02 kJ/mol. The heat capacity of solid and liquid ethanol are 0.97 J/g-K and 2.3 J/g-K‚ respectively. How much heat (kJ) is needed to convert 25.0 g of solid ethanol at -135°C to liquid ethanol at -50°C? A) 207.3 B) -12.7 C) 6.91 D) 4192 E)
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Crystallization Because chemists always want to get the chemicals they get as pure as possible. And a good way to purify chemicals is to make crystals of them. When they are in solutions you can have all sort of impunities but when they form crystals the crystals contain much purer compounds than in the solution and the impurities are left in the solution. generally the crystal is a very precise arrangement of molecules all the same fitting together like pieces and some sort of construction
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Melting Points Elizabeth McGrail Organic Chemistry I 25 January 2013 ABSTRACT The objectives of this lab are‚ as follows; to understand what occurs at the molecular level when a substance melts; to understand the primary purpose of melting point data; to demonstrate the technique for obtaining the melting point of an organic substance; and to explain the effect of impurities on the melting point of a substance. Through the experimentation of three substances‚ tetracosane‚ 1-tetradecanol and
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