Unit 3 – Virtual Labs Letizia Schianodicola Lab #1 – Atomic Weight of Magnesium 1. Moles of hydrogen evolved‚ from chemical property dialog for beaker: a. 0.000411 mol H2 2. Calculate the atomic weight of Magnesium. Atomic weight of Mg = weight of Magnesium/moles of H2. b. 59‚136.253 g/mol Mg (24.305 - weight of Mg / 0.000411 mol H2) 3. Calculate the # of molecules of H2 that were produced in the reaction – use Avagadro’s number –
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the equilibrium constant of the same reaction at a different temperature‚ allowing it to be worked out for all temperatures if it is known for one. The experiment used the solution of toluene and naphthalene to determine the change in enthalpy. The mole fractions and the tempterature of recrylstallizations were graphed and the slope was determined. From the slope the change in enthalpy was determined to be 3.45J. This implies that energy is absorbed by the system. INTRODUCTION Solutions are
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0.87 % Using mole ratio‚ HCl : NaOH 1 : 1 Number of moles of HCl in 25.00 〖cm〗^3 of solution = 0.00575 mol % ∆ of moles = 0.87 % Number of moles of excess HCl in 250.0 〖cm〗^3 volumetric flask 0.00575 × 250.0/25.00=0.0575 mols % ∆ of pipette 0.03/(25.00 ) × 100 % = 0.12 % % ∆ of volumetric flask 0.3/250.0 × 100 %= 0.12 % % ∆ of moles of HCl 0.12% + 0.12% + 0.87% = 1.11% Initial mole of HCl added to eggshell 2.00 × 50/1000 = 0.100 mols % ∆ of moles of HCl 0.50/50
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05.09 Module Five Review and DBA 05.01 Four Phases of Matter * Matter exists in different phases‚ also called states‚ which include solid‚liquid‚ gas‚ and plasma. These phases can be distinguished at the molecular level by how the particles are held together. * Solids * In the solid phase‚ the intermolecular attraction between particles of matter is strong enough to hold all the particles together in a fixed three-dimensional arrangement. Because of the rigid arrangement of particles
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all percentages to a mass in grams‚ eg‚ 21% = 21g‚ 9% = 9g c. Find the relative atomic mass (r.a.m) of each element present using the Periodic Table d. Calculate the moles of each element present: n = mass ÷ r.a.m e. Divide the moles of each element by the smallest of these to get a mole ratio f. If the numbers in the mole ratio are all
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experiment was to react salicylic acid with ethanoic anhydride to produce Aspirin. CH3CO)2O + HOC6H4COOH → CH3CO2C6H4CO2H + CH3COOH i Mass: 5g Volume: 7.5 cm3 Mass: 6.52g RMM: 138g/mol RMM: 180g/mol Moles: 5/138 = 0.0362 RMM: 102g/mol Moles: 0.0362 OBSERVATIONS – First‚ Ethanoic acid was added to the salicylic acid which resulted in a cloudy solution. When adding a few drops of concentrated sulfuric acid‚ which acted as a catalyst‚ effervescence transpired and
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Cup o’ Noodles: Through the Eyes of a Chemist Background: Before completing this experiment‚ one must know about chemical formulas‚ ionic bonding‚ solutions and moles to understand the results of this experiment. A chemical formula is the symbol for compounds and elements. It tells chemists how many atoms are in a chemical compound‚ formula unit or molecular compound. In a chemical formula a subscript indicates how many atoms there are of an element before it. The coefficient in a chemical formula
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Abstract Pyrorle-2-aldehyde and 1‚3-diaminopropane react under reflux to form a transition metal ion of Nickel(II)‚ that further more react with nickel acetate to form red crystals through condensation‚ the colour being constituded by the congugated bonds. These series of reactions synthesize the Schiff Base ligand and Nickel(II) complex of the Schiff base ligand. 0.36g of the Schiff base ligand is yielded and 0.1g of the nickel complex is yielded from the 0.36g Schiff base ligand and 0.5g nickel
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salt over icy roads in winter in the North? Explain. This actually is interesting and since I lived up North I know that the truck don’t actually melt the ice but rather bring the temp of the ice melting point. 7. Will 1 L of 1 M NaCl contain mole chloride ions than 0.5 L of 1 M MgCl2? Explain. Support your answer by calculations. They will contain the same number of chloride ions. .5L( 1 mol MgCl2/L) ( 2 mol Cl-/1 mol MgCl2) = 1 mol Cl- 8. Describe step by step how you would
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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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