...re the odor threshold for formaldehyde is 0.83 ppm. 1,8 Formaldehyde is readily soluble in ater at room temperature. 1 Commercial formaldehyde is produced and sold as an aqueous solution containing 37 to 50 percent formaldehyde by eight. 1Physical Data Vapor Pressure 52mm i 37 C Specific Gravity 1.083 Vapor Density 1.03 Appearance colorless liquidHazardous Decomposition Carbon Monoxide Carbon DioxideFire Hazard Data Flash point 310 F 154C Autoignition Temp 932 F 499 C Extinguishers ater spray, Carbon dioxide, dry chemical poder or appropriate foam. Special Procedures ear self-contained breathing apparatus and protective clothing to prevent contact ith skin and eyes, ear rubber gloves. Unusual Fire hazards Emits toxic fumes under fire conditionsDisposalSpill Procedures Evacuate area. ear self-contained breathing apparatus, rubber boots and heavy rubber gloves. Cover ith lime or soda ash and place in closed containers for disposal. Ventilate area and ash spill site after material pickup is complete. Combustible LiquidDisposal Dissolve or mix the material ith a combustible solvent and burn in a chemical incinerator equipped ith an afterburner and scrubber. Observe all federal, state, and local environmental regulationsChemical StructureFormaldehyde - H2COPRIVATEPRIVATEH3t C1 O2 H4Atomic Charges and Dipole MomentC1 charge 0.358O2 charge-0.398H3 charge 0.020H4 charge 0.020ith a dipole moment of 2.46866 Debye Bond Lengthsbeteen C1 and O2 distance1.220 angsss beteen C1 and H3 distance1.122 angsss beteen C1 and H4 distance1.122 angsss Bond Anglesfor H3-C1-O2 angle121.7 degsss for H4-C1-O2 angle121.8 degsss Bond Orders Mullikenbeteen C1 and O2 order1.870sss beteen C1 and H3 order0.940sss beteen C1 and H4 order0.940sss Best Leis StructureThe Leis structure that is closest to your structure is determined. The hybridization of the atoms in this idealized Leis structure is given in the table belo. Hybridization in the Best Leis Structure1. A bonding orbital for C1-O2 ith 1.9999 electronssshas 32.04 C1 character in a p-pi orbital 99.45 p 0.55 dsshas 67.96 O2 character in a p-pi orbital 99.81 p 0.19 d2. A bonding orbital for C1-O2 ith 1.9994 electronssshas 34.65 C1 character in a sp1.84 hybridsshas 65.35 O2 character in a sp1.49 hybrid3. A bonding orbital for C1-H3 ith 1.9932 electronssshas 56.45 C1 character in a sp2.04 hybridsshas 43.55 H3 character in a s orbital4. A bonding orbital for C1-H4 ith 1.9932 electronssshas 56.45 C1 character in a sp2.04 hybridsshas 43.55 H4 character in a s orbital7. A lone pair orbital for O2 ith 1.9870 electronsssmade from a sp0.65 hybrid8. A lone pair orbital for O2 ith 1.9069 electronsssmade from a p-pi orbital 99.92 p 0.08 d-ith core pairs on C1 O2 - Donor Acceptor Interactions in the Best Leis StructureThe localized orbitals in your best Leis structure can interact strongly. A filled bonding or lone pair orbital can act as a donor and an empty or filled bonding, antibonding, or lone pair orbital can act as an acceptor. These interactions can strengthen and eaken bonds. For example, a lone pair donor-antibonding acceptor orbital interaction ill eaken the bond associated ith the antibonding orbital. Conversly, an interaction ith a bonding pair as the acceptor ill strengthen the bond. Strong electron delocalization in your best Leis structure ill also sho up as donor-acceptor interactions. Interactions greater than 20 kJmol for bonding and lone pair orbitals are listed belo. The interaction of the second lone pair donor orbital, 8, for O2 ith the antibonding acceptor orbital, 59, for C1-H3 is 114. kJmol. The interaction of the second lone pair donor orbital, 8, for O2 ith the antibonding acceptor orbital, 60, for C1-H4 is 114. kJmol. Molecular Orbital EnergiesThe orbital energies are given in eV, here 1 eV96.49 kJmol. Orbitals ith very lo energy are core 1s orbitals. More antibonding orbitals than you might expect are sometimes listed, because d orbitals are alays included for heavy atoms and p orbitals are included for H atoms. Up spins are shon ith a and don spins are shon as v. 12 ----- 3.09011 ----- 2.59810 ----- 1.8089 ----- -2.9498 --v- -6.2767 --v- -10.196 --v- -10.985 --v- -12.144 --v- -15.603 --v- -26.432 --v- -269.11 --v- -507.0 Total Electronic EnergyThe total electronic energy is a very large number, so by convention the units are given in atomic units, that is Hartrees H. One Hartree is 2625.5 kJmol. The energy reference is for totally dissociated atoms. In other ords, the reference state is a gas consisting of nuclei and electrons all at infinite distance from each other. The electronic energy includes all electric interactions and the kinetic energy of the electrons. This energy does not include translation, rotation, or vibration of the molecule. Total electronic energy -114.5456831412 Hartrees Preparation MethodsThe Photoproduction of Organic Residues in Laboratory Interstellar Ice AnalogsUV Ultraviolet radiation probably causes significant HYPERLINK PhotoEvidence.htmlphotochemistry ithin the HYPERLINK MixedIces.htmlmixed-molecular ices found in space. e simulate this process in our laboratory using some HYPERLINK equipment.htmlhigh-tech gadgetry. hen e simulate the photochemistry of interstellar and cometary ices in the lab e make a host of organic compounds i.e. compounds composed primarily of carbon, the kinds of molecules from hich e and all living things are made. e believe this process may be responsible for the richness of the organics seen in the HYPERLINK DISM.htmlDiffuse and HYPERLINK DenseISM.htmlDense Interstellar Medium, comets, and meteorites.Many people believe that organic compounds from comets and asteriods helped to make life on Earth possible, so some of these compounds have potential HYPERLINK LifeImplications.htmlimplications for the origin of life on the Earth. Organic CompoundsSince comets and interstellar ices are composed primarily of ater e started ith ices of ater and other simple compounds knon to be in space like methanol CH3OH, carbon monoxide CO and ammonia NH3. From such simple starting materials e ere able to make things like methane CH4, carbon dioxide CO2, ethanol CH3CH2OH, formamide, acetamide, ketones, and alcohols. After these sun-burnt ices are armed up and the volatiles sublime aay e ere able to detect some larger compounds like polyoxymethylene - based polymers POMs, and hexamethylene tetramine HMT. A number of these compounds have potential HYPERLINK LifeImplications.htmlimplications for the origin of life on the Earth. For example, hexamethylenetetramine HYPERLINK hmt1.htmlHMT C6H12N4 is a potential source of formaldehyde and ammonia and the acid hydrolysis of HMT leads to the production of amino acids. Follo these links to see ho e HYPERLINK HMTvsRes.htmlidentified HMT and ho e think it HYPERLINK HMTmech.htmlformed. More Complex Organic CompoundsEven though HMT and POM have molecular eights over 100 amu these are just the smaller compounds. There are much larger organic mater...
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