Depends on: 1) solubility of the compound 2) differences in solubility of the desired solutes & impurities dissolved in the solvent - Common Solvents Used: Solvent | Formula | Polarity | Boiling Pt. (oC) | Water | H2O | Very Polar | 100 | Ethanol | CH3CH2OH | Polar | 78 | Methanol | CH3OH | Polar | 65 | dichloromethane | CH2Cl2 | Slightly Polar | 40 | Diethyl ether | (CH3CH2)2O | Slightly Polar | 35 | IV. Experimental 0.100 g of powdered impure benzoic
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Tasia Walker Masculinity in Rap and Hip Hop Today in Hip Hop every rapper has to portray themselves as being hard‚ having a lot of girls in their circle and having money. Since the beginning of the American society being considered a real man was to be able to protect their families. When television came around western films portrayed men as either strong or weak and defined their masculinity as being the stronger man because of their guns. For
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If you are new to running‚ you are likely hearing advice from many other people. Whether they are runners‚ or they just wish they could run‚ many people have an opinion about exactly what you should be doing as a new runner. While some of that advice is great‚ make sure you take in the advice carefully. If you have just started running‚ consider these three things. Everyone Started Somewhere Whether you are running around a track‚ jogging along a track‚ or you take your jog somewhere else‚ if
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and produces an anhydrous salt and water (in the form of steam). BaCl2(2H2O (s ) ( BaCl2 (s) + 2 H2O (g) Examples and Problems Problem 1-Theoretical Percentage Calculate the theoretical percentage of water in barium chloride dihydrate. Solution: The formula mass of BaCl2(2H2O is Ba 1 x 137.3 = 137.3 amu Cl 2 x 35.5 = 71.0 amu H2O 2 x 18.0 = 36.0 amu 244.3 amu The theoretical percentage of water is found by dividing the water of
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also rises 4. Temperature C | Your data KNO3 in grams per 100 ml of H2O | CCZ data KNO3 in grams per 100ml of H2O | 35 C | 49 | 49 | 35 C | 49 | 49 | 70 C | 135 | 180 | 5. Data pointGrams of KNO3 in grams per 100ml of H2O at C | Your data saturated‚ unsaturated or supersaturated | CCZ data saturated‚ unsaturated or supersaturated | 75g of KNO3/100g H2O at 40 C | Saturated | Not saturated | 60g of KNO3 /100g H2O at 50 C | Not saturated | Not saturated | 80g of KNO3/100g H20 at
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condensation formed from the heptane flame. Reactants: C7H16 and O2 Products: CO2 and H2O Balanced chemical equation C7H16 + O2 7CO2 + 2H2O Table 8.3- Single replacement reaction of sodium Observations Test tube was hot after reaction; exothermic reaction took place; sodium was malleable; when sodium was added to diH2O it popped and fizzled; solution turned pink when phenolphthalein was added. Reactants: Na and H2O Products: H2 and NaOH Balanced chemical equation 2Na + 2H2O 2NaOH + H2
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Natural Source Man-made source Effect on health Methods of reduction Carbon monoxide (CO) Atmospheric oxidation of methane (plant degradation) CH4 + ½ O2 CO + 2 H2 Natural forest fires Incomplete combustion of fossil fuels C8H18 + 8 ½ O2 8 CO + 9 H2O Forest fires Prevents hemoglobin from carrying oxygen by forming carboxyhemoglobin Headaches Shortness of breath Unconsciousness Death Lean-burn engines decrease fuel-air ratio to 18 CO(g) + O(g) 2 CO2 Catalytic converter which achieve high rate of
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irritate the respiratory tract and also if contacted with eyes‚ the chemical may cause slight irritation. If sodium bicarbonate is inhaled‚ symptoms may include coughing and sneezing. (j) Are there any environmental concerns with this chemical? There are not any environmental concerns with this chemical. (k) Describe how you would decompose sodium bicarbonate. In your description include a temperature at which NaHCO3 would decompose. Sodium bicarbonate will start decomposing when heated at a temperature
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113 Lab 10/13/2011 1) Method 1: Adding acid NaHCO3 + HCl → NaCl + CO2 + H2O a) Unknown mixture of NaCl and NaHCO3 Mass of unknown mixture (NaCl + NaHCO3) | 3 g | Mass of HCl | 30 .31g | Mass of products ( NaCl + H2O ) | 26.98 g | Calculate mass of CO2 | 6.33g | Calculate mass of NaHCO3 | 12 .1 g | i) Calculation : Mass of CO2 = [Mass of unknown mixture (NaCl + NaHCO3) + Mass of HCl ] – [Mass of NaCl + H2O] = (3 g + 30.31 g) – 26.98 g = 6.33g Mass of NaHCO3 : 6.33 g CO2 * 1 mol
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grams Therefore‚ mass of Water that has escaped = (mass of crushed hydrate) - (mass of crushed hydrate after heating) Mass of H2O = 2.98 grams Therefore mols of H2O = (2.98g) * (1mol)\(18g) = .165 mols H2O So‚ mols of Cu2SO4 = (3.49g) * (1mol)\(223.15g) = .015 mols Cu2SO4 Divide by .015 Common ratio: Cu2SO4 = 1 H2O = 10 Therefore‚ empirical formula of Cu2SO4 . H2O should be: Cu2SO4 . 10H2O Conclusion: A hydrate is a substance that holds water in a certain ratio. As Hydrates are compounds
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