Experiment2: Preparation of Dibenzalacetone Aim: Using the cabon-cabon bond making ability in carbonyl chemistry‚ Dibenzalacetone is synthesized from 2 equivalent of benzaldehyde and 1 equivalent of acetone in a base catalyzed reaction. Physical Data1: *detailed risk and safety phrases are attached. substance Hazards‚ risks and safety practices MW (g/mol) Amt. Used Mol. mp (K) bp (K) density(g/cm^3) acetone R11‚ R36‚ R67‚ S9‚ S25‚ S26 58.08 0.24 g 0.004 178.2 329.4 0.79 benzaldehyde R22
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LA PURISIMA CONCEPCION ACADEMY (Formerly Mataasnakahoy High School ) Committed to Faithful Service; Inspired by Love FOURTH QUARTER LEARNING PLAN 4.1 Understanding by Design (UBD) Plan in Science and Technology III ( Chemistry ) ____________________________________________________________________________ Topic: Chemical Accounting Subject Area: Chemistry Big Ideas: The Chemical Reactions Year Level: Third Year Allocated
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Solubility and Stoichiometry I. Introduction The first purpose of this experiment is to apply solubility rules to choose two of eight given reactants to do a precipitation reaction. The second purpose is to use stoichiometry to calculate how much of a reactant will be used in a precipitation reaction‚ assuming that the amount of product is given‚ and to figure out the actual yield vs. the theoretical yield and to calculate the percent yield. The other purpose of this experiment is to practice the
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16. Pure nitrogen combines directly with an active metal to form a - Nitride 17. In a sample of solid Al(NO3)3‚ the ratio of aluminum ions to nitrate ions is - 1:3 18. In a sample of solid calcium phosphate Ca3(PO4)2‚ the ratio of calcium ions to phosphate ions is - 3:2 19. What is the total number of atoms in (NH4)2SO4? - 15 20. What is the total number of oxygen atoms present in one unit of Mg(ClO3)2? - 6 21. What is the total number of atoms of oxygen in the formula Al(ClO3)3.6H2O?
Free Oxide Oxygen Aluminium
6. Discuss which of the following substances will increase‚ decrease or have no effect on the hardness of water: Ca (OH)2‚ Mg(HCO3)2‚ MgSO4‚ Ca(HCO3)2‚ CaSO4‚ CaCl2‚ KCl‚ NH4Cl‚ NH4OH‚ NH4)2CO3‚ Na2SO4‚ BaCO3‚ NaCl‚ NaOH‚ Na2CO3‚ Na3PO4‚ NaAlO2‚ Na2[Na4(PO3)6]. 7. 0.5 g CaCO3 was dissolved in dil HCl and diluted to 500 ml. 50 ml of this required 40 ml EDTA. 100 ml hard water required 50 ml EDTA and after boiling 50 ml consumed 20 ml EDTA. Calculate temporary hardness. 8
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Baking Soda (NaHCO3) Lab (Stoichiometry) - Physical Science Name: __________________________________________________ Purposes: 1. Calculate theoretical mass of NaCl based on a known mass of NaHCO3. 2. Experimentally determine the actual mass of NaCl produced. 3. Calculate the percent yield for your experiment. Reaction Equation: NaHCO3(s) + HCl(aq) ( NaCl(s) + CO2(g) + H2O(l) Materials: safety glasses baking soda (NaHCO3) 1 M HCl and
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Aspirin Synthesis Introduction Out of all the pharmaceutical drugs in the worlds‚ aspirin is made the most. Any potential pharmacist must be familiar with synthesizing the drug. The goal of this lab is to synthesize as much pure aspirin as possible. The reactants‚ acetyl anhydride and salicylic acid‚ must react in phosphoric acid. With phosphoric acid as a catalyst‚ the reaction yields aspirin and acetic acid. The equation for the reaction is as follows: “(CH3CO)2O + HOC6H4COOH □(→┴yields ) CH3CO2C6H4CO2H
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hydrogen gas produced. I will do that by dividing the volume of gas produced by 24000cm3 : Moles (n) = Volume (cm") 24000 cm" So: n = 122 cm" = 0.005083 mol of H2 24000 cm" Equation: 2 Li(s) + 2 H2O (L)2LiOH(Ag) + H2 (g) By looking at the Stoichiometry ratio in the reaction I can see that the ratio of Li: H2 is 2:1‚ therefore the number of moles of Li will be twice as the number of moles of H2 in the reaction. So: 0.005083 x 2= 0.010166 mol of Li Mass of Lithium = Mass of the Lithium plus
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white solid from evaporation conductive ● Water ○ no residue when evaporated ○ almost neutral ph ■ ^my group got pH 9 tho?? ○ no conductivity there was conductivity for 2 contamination could have been present causing the conductivity Unknown 3 ● NiCl2 or CuCl2 ○ i dont think its copper cuz of color of solution ○ I think that it can be NiCl2 or NiSo4 cuz Ni turned blue in presence of ammonia (i think only periods 1 and 2 can use this) ○ Was solution 3 soluble or insoluble in
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this investigation an unknown volatile liquid is vaporized so that the ideal gas law can be used to determine its molar mass. This study will apply the ideal gas law in tandem with the concept of volatile liquids and basic molar mass related stoichiometry to identify the molar mass of an unknown liquid. A small sample of the unknown liquid was but into Erlenmeyer flask and vaporized in a water bath. Measurements of mass‚ pressure‚ temperature and volume were taken in order to calculate a molar mass
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