students‚ you can teach them about negative exponents. Then they can explore the half-life of certain radioactive elements‚ or the size of bacteria and viruses. Explore many scientific facts‚ such as the boiling and freezing point of liquids‚ the melting and freezing points of solids‚ and the temperature of planets‚ Have you been to the playground lately? You’ll find many connections between algebra‚ science‚ and the real world in our article entitled | Math and Social Studiesstudents apply
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Physical Lab 15: Chemical and Physical Properties Experiment 1: Physical Properties of Water Data Table 1: Melting Point Data Initial Time Final Time Observations Weigh Boat A 5:37 pm 7:00 pm 10 min- little puddle just started melting. 20 min- puddle under ice is a little bigger. 30 min- ice is melting more and getting a wetter appearance. 40 min- about half way melted. 50min- still slowly melting a bit more than half gone. 60 min- about a quarter of the cube remains. 70 min- a little les than a
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Christina Hang Vanessa Hang Seng Xiong Period 5 December 14‚ 2012 Molecular Mass by Freezing Point Depression Objective: Determine the molecular mass of an unknown substance by finding the change in freezing point of a solvent when the unknown substance is dissolved in it. Qualitative Data: Trials BHT (g) Cetyl –Alcohol (g) Unknown substance (g) Melting Temperature 1 0.48 g 0 0 69.3 2 0.46 g 0.09 g 0 66.9 3 0.49 g 0 0.11 g 53.7 Analysis: 1.) Determine ___ for the solution of cetyl
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virgin polycrystalline silicon which are placed in a quartz crucible along with small quantities of elements called dopants - the most common of which are boron‚ phosphorus‚ arsenic and antimony. The materials are heated to a temperature above the melting point of silicon‚ 1420 degrees Celsius. Once the polycrystalline and dopant combination has been liquefied‚ a single silicon crystal‚ the seed‚ is positioned on top of the melt‚ barely touching the surface. The seed has the same crystal orientation required
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intermolecular attraction. For example‚ the freezing point of a solution is lower than that of the of the pure solvent and the boiling point is higher. Colligative properties of solution are those that depend on the concentration of solute particles in the solution‚ regardless of what kinds of particles are present the greater the concentration of any solute‚ the lower the freezing point and the higher the boiling point of a solution. FREEZING POINT LOWERING A liquid begins to freeze when temperature
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Polymer Essay: Plexiglass Many of the glass screens and windows we see today are not really made of glass. They are made of plexiglass. Plexiglass is not related to the chemical structure of glass at all. It is an organic polymer. Today this polymer is used in all sorts of applications. The formation of plexiglass was begun in 1930‚ at McGi11 University by William Chalmers‚ a research student. He polymerized methacrylic ethyl ester and methacrylic nitirile‚ creating a clear plastic paste
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temperature where the lowest melting constituent of steel starts to melt. The strength decreases and looses plasticity and tind to crumble under applied stress instead of flow. 2. Selection of temperature depends on a) Chemistry. b) Melting point of the lowest constituent. 3. Finishing temperatures. Lower the finishing temperature finer the structure of the piece but limited to mass and shape. The finishing temperature should be near the lower transformation point. SCALING 1. Not
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Exercise 1 Binary Solid-Liquid Diagram CHEM 112.1 – 2L Group 2 I. Data and Results Table 1.1 Break and arrest temperature of diphenylamine-naphthalene mixture. Table 1.1. Mole fraction of naphthalene‚ χB‚ and corresponding arrest and break temperature at each run. Run number | Mole Fraction‚XB | Ave. break temperature‚ ˚C | Ave. arrest temperature‚ ˚C | 1 | 1 | 72 | 35.4375 | 2 | 0.868388 | 72 | 35.4375 | 3 | 0.725218 | 62 | 35.4375 | 4 | 0.568895 | 49 | 35.4375
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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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