• Online Middle School Chemistry Resource

    Updated: 2024-05-31 19:48:13
    The ACS Education Division has developed a new middle school chemistry resource, "Middle School Chemistry: Big Ideas about the Very Small." This free, six-chapter resource can serve as either a stand-alone chemistry unit or as a supplement to any middle school science curriculum. "Middle School Chemistry" uses a hands-on inquiry approach along with specially designed molecular model animations, to take students from concrete experiences to an understanding of the world of atoms and molecules. Share this free resource with middle school teachers you know.

  • Re: Acidity of 2-chloropentanoic acid vs 3-fluoropentanoic acid

    Updated: 2024-05-31 10:30:26
    Hard to say, but my intuition strongly suggests that distance loses to electronegativity. You are looking at the change in electronegative effects over the distance (approximately) of a C-C bond length (~1.5 Å), and electrostatic effects decay quite fast with distance. bsp

  • Re: Acidity of 2-chloropentanoic acid vs 3-fluoropentanoic acid

    Updated: 2024-05-31 06:50:32
    I agree this is dubious, two competing factors changing at the same time. The only way to say for sure is to compare pKa data (no, I don'#039t have a source at hand)

  • Re: Negative Induction effect with respect to Electron Deficiency

    Updated: 2024-05-31 06:23:59
    I dont know how relevant this is, but aniline in its protonated form is much less reactive towards electrophiles than it is as free base. Also, phenol in its anionic form is much more reactive towards electrophiles than it is in its non-charged form

  • Re: Negative Induction effect with respect to Electron Deficiency

    Updated: 2024-05-31 04:17:23
    : Chemical Forums 1 Hour 1 Day 1 Week 1 Month Forever May 31, 2024, 03:48:17 PM Forum Rules Read This Before Posting Home Help Search Login Register Chemical Forums Chemistry Forums for Students Organic Chemistry Forum Negative Induction effect with respect to Electron Deficiency previous next Print Pages : 1 Go Down Topic : Negative Induction effect with respect to Electron Deficiency Read 1508 times 0 Members and 1 Guest are viewing this topic . IndianKemistryHater Very New Member Posts : 1 Mole Snacks : 0 0 Negative Induction effect with respect to Electron Deficiency : on February 08, 2024, 02:43:02 AM I am pretty weak at Chem , so forgive me for thenstupid . question I am really confused that whether an Electron Deficient Species(a Cation shows more negative I effect than an anion If

  • Acidity of 2-chloropentanoic acid vs 3-fluoropentanoic acid

    Updated: 2024-05-31 00:23:20
    : Chemical Forums 1 Hour 1 Day 1 Week 1 Month Forever May 31, 2024, 03:48:16 PM Forum Rules Read This Before Posting Home Help Search Login Register Chemical Forums Chemistry Forums for Students Organic Chemistry Forum Acidity of 2-chloropentanoic acid vs 3-fluoropentanoic acid previous next Print Pages : 1 Go Down Topic : Acidity of 2-chloropentanoic acid vs 3-fluoropentanoic acid Read 128 times 0 Members and 1 Guest are viewing this topic . justswimmingly New Member Posts : 4 Mole Snacks : 0 0 Acidity of 2-chloropentanoic acid vs 3-fluoropentanoic acid : on Yesterday at 08:23:20 PM I†m tutoring ochem this summer , and my students had a question from the professor about ranking the acidity of various compounds . Most were easy enough , but they were confused about whether

  • Alanna Scheparz’s 2023 NOS Lecture is Available On-Line

    Updated: 2024-05-29 05:30:14
    We are now able to release the video of the lecture by Alanna Scheparz (University of California, Berkeley) entitled “Genetically Encoded Protein Editing, in vitro and in vivo” which was given at the 2023 National Organic Chemistry Symposium (NOS). The 48th NOS was held July 9–13, 2023 on the campus of the University of Notre … Read More The post Alanna Scheparz’s 2023 NOS Lecture is Available On-Line appeared first on ACS Division of Organic Chemistry.

  • Lisa McElwee-White Selected as the 2024 Gassman Awardee

    Updated: 2024-05-18 15:14:00
    Join Login About Us News Events A Message from the Chair Latest News Calendar of Events Newsletter Archive Membership Join Contact Us Feedback Membership Benefits Membership Benefits PDF The Division Executive Committee Bylaws Frequently Asked Questions History of the Division Awards Earned by the Division indicates you must be a member of the DOC to . access Resources Videos Eminent Organic Chemists†Videos Historic Chemistry Videos Past Virtual Symposia NOS Lecture Videos Other Organic Chemistry Videos Literature Organic Chemistry Journals Organic Syntheses Organic Reactions Chemistry Reference Resolver Organic Related RSS Feeds Organic Chemistry Info Organic Chemistry Data Website Links to Organic Chemistry Sources Green Organic Chemistry Organic Solvent Data Synthetic Organic Groups

  • Jason Stevens’ 2023 NOS Lecture is Available On-Line

    Updated: 2024-05-08 17:30:09
    Join Login About Us News Events A Message from the Chair Latest News Calendar of Events Newsletter Archive Membership Join Contact Us Feedback Membership Benefits Membership Benefits PDF The Division Executive Committee Bylaws Frequently Asked Questions History of the Division Awards Earned by the Division indicates you must be a member of the DOC to . access Resources Videos Eminent Organic Chemists†Videos Historic Chemistry Videos Past Virtual Symposia NOS Lecture Videos Other Organic Chemistry Videos Literature Organic Chemistry Journals Organic Syntheses Organic Reactions Chemistry Reference Resolver Organic Related RSS Feeds Organic Chemistry Info Organic Chemistry Data Website Links to Organic Chemistry Sources Green Organic Chemistry Organic Solvent Data Synthetic Organic Groups

  • Organic Reactions Publishes volume 114

    Updated: 2024-05-01 17:39:48
    Organic Reactions is pleased to announce that they are now producing graphical abstracts for their new chapters through their new website and they plan to share the titles with the Organic Division. We feel it is is a service to the community to share the titles and abstracts to our members for well know useful … Read More The post Organic Reactions Publishes volume 114 appeared first on ACS Division of Organic Chemistry.

  • Joint ACS-RSC-SCI Symposium – Oliver Ring and Sarah Reisman – Excellence in Synthetic Chemistry Innovation

    Updated: 2024-04-25 16:06:28
    Join Login About Us News Events A Message from the Chair Latest News Calendar of Events Newsletter Archive Membership Join Contact Us Feedback Membership Benefits Membership Benefits PDF The Division Executive Committee Bylaws Frequently Asked Questions History of the Division Awards Earned by the Division indicates you must be a member of the DOC to . access Resources Videos Eminent Organic Chemists†Videos Historic Chemistry Videos Past Virtual Symposia NOS Lecture Videos Other Organic Chemistry Videos Literature Organic Chemistry Journals Organic Syntheses Organic Reactions Chemistry Reference Resolver Organic Related RSS Feeds Organic Chemistry Info Organic Chemistry Data Website Links to Organic Chemistry Sources Green Organic Chemistry Organic Solvent Data Synthetic Organic Groups

  • Periodic Table Trends

    Updated: 2024-04-22 01:02:23
    KNOWLEDGE IS POWER Mad Scientist Chemistry Chemistry . notes Periodic Table Trends General Atomic Size Atomic size increases down the groups as more protons are added to the nucleus and higher electron energy levels are . filled It decreases from left to right across the periods as the same electron energy level is filled and the larger nucleus pulls the electrons closer . Electron shielding lowers Z eff less than increasing numbers of protons in the nucleus raises it Ionization Energy Ionization Energy IE is the energy needed to remove an electron from an atom . It decreases with increasing atomic size because the further away from the nucleus the less Z eff Electronegativity Electronegativity EN is the ability to attract electrons and naturally follows the same pattern as IE , however

  • Bridge Bonds

    Updated: 2024-04-22 01:02:22
    A bridge bond is a covalent bond through which 3 atoms share 2 electrons.For example in a B-H-B bridge bond an electron from one of the B atoms and one from the H atom would be shared between all 3 atoms. Each of the 3 atoms would consider itself the owner of the 2 electrons in terms of filling its valence shell.

  • Colligative Properties of Solutions

    Updated: 2024-04-22 01:01:22
    KNOWLEDGE IS POWER Mad Scientist Chemistry Chemistry . notes Colligative Properties of Solutions Colligative means collective . Properties of a solution are influenced by the number of solute particles . present 1. VP Vapor Pressure is . lowered 2. BP Boiling Point is . elevated 3. FP Freezing Point is . lowered 4. OP Osmotic Pressure is . increased Nonvolatile Nonelectrolyte Solutions Volatility is the tendency of a substance to become a gas . Electrolytes are a mixture of ions that when dissolved in solution conduct a current . When a nonvolatile nonelectrolyte substance is dissolved in : solution 1. VP is . lowered The nonvolatile solute particles don't leave the surface of the solution , so the percentage of particles on the surface of the solution that can leave it is smaller than in

  • Intermolecular Forces

    Updated: 2024-04-22 01:01:22
    KNOWLEDGE IS POWER Mad Scientist Chemistry Chemistry . notes Intermolecular Forces Ion-Dipole Forces The attraction between an ion and a pole of a polar molecule(dipole BE(Bond Energy 40-600 kJ mol Dipole-Dipole Forces The attraction between oppositely charged poles of polar . molecules BE 5-25 kJ mol Hydrogen Bond When an H atom is bound to a small and highly electronegative atom with lone pairs N,O or F the electrons are drawn away from the H atom making this particular covalent bond very polar . The H atom has a relatively strong charge and the N , O or F atom has a relatively strong charge . The H atom of one of these molecules forms very strong bonds with the N , O or F atom of another of the molecules . The H atom is specifically attracted to the lone pairs of electrons of the N , O

  • Hess's Law

    Updated: 2024-04-22 01:01:22
    KNOWLEDGE IS POWER Mad Scientist Chemistry Chemistry . notes Hess's Law Hess's law of heat summation states that the enthalpy change of an overall process is the sum of the enthalpy changes of the individual steps of the process Because of this , we can select any number of steps with known enthalpy changes that lead us from an initial state to a final state even if in reality the process does not follow the path we have . chosen Example If we know how much energy it takes to heat a can of soup by 100 degrees and how much is released when it cools by 10 degrees we can work out how much energy it takes to heat it by 90 degrees . We do this by adding the enthalpy changes of heating by 100 degrees and cooling by 10. H heating by 90 H heating by 100 H cooling by 10 In reality if we heated the

  • Solutions and Solubility

    Updated: 2024-04-22 01:01:21
    KNOWLEDGE IS POWER Mad Scientist Chemistry Chemistry . notes Solutions and Solubility Like dissolves Like When one substance dissolves in another , the intermolecular bonds in the solute must break , as must those in the solvent . The breaking of these bonds requires energy endothermic while the formation of new bonds between solvent and solute molecules releases energy . exothermic If the strength of the bonds broken is too much greater than of those formed the substance will not . dissolve Examples 1. When NaCl dissolves in water the H-bonds between the water molecules break as do the ionic bonds between Na+ and Cl- ions . However the ion-dipole bonds that form between the H2O and the ions are very strong and so release much energy upn formation . This release of energy is close enough

  • Conduction and Band Theory

    Updated: 2024-04-22 01:01:21
    KNOWLEDGE IS POWER Mad Scientist Chemistry Chemistry . notes Conduction and Band Theory Band Theory Band theory is an extension of MO(molecular orbital . theory The more atoms that join together in a molecule the more MOs are . created With the number of atoms in a sample of metal moles Avogadro's number a large number of MOs are formed and thus the energies of the MOs are so closely spaced that they form a continuum or . band According to band theory the lower energy MOs are occupied by the valence electrons . These make up the valence . band The empty MOs of higher energy make up the conduction . band Conduction Conductors In conductors such as metals there is no gap between the valence band and the conduction band . This means that electrons can enter the valence band when they receive

  • Gases

    Updated: 2024-04-22 01:01:21
    KNOWLEDGE IS POWER Mad Scientist Chemistry Chemistry . notes Gases Gas Laws Boyle's Law At a constant temperature and pressure , the volume occupied by a fixed amount of gas is inversely proportional to the applied external . pressure V 1 P constant Charles's Law At a constant pressure the volume occupied by a fixed amount of gas is directly proportional to its absolute . temperature V constant T Combined Gas Law Combining the relationships in Charles's and Boyle's gives the combined gas law which : is V constant T P The relationship between pressure and temperature for a gas : is P T constant At constant volume , the pressure exerted by a fixed amount of gas is directly proportional to the absolute temperature . Avogadro's Law At fixed temperature and pressure , equal volumes of any ideal

  • DOC Virtual Symposium-Alex Grenning and David Nagib

    Updated: 2024-04-22 01:01:13
    Join Login About Us News Events A Message from the Chair Latest News Calendar of Events Newsletter Archive Membership Join Contact Us Feedback Membership Benefits Membership Benefits PDF The Division Executive Committee Bylaws Frequently Asked Questions History of the Division Awards Earned by the Division indicates you must be a member of the DOC to . access Resources Videos Eminent Organic Chemists†Videos Historic Chemistry Videos Past Virtual Symposia NOS Lecture Videos Other Organic Chemistry Videos Literature Organic Chemistry Journals Organic Syntheses Organic Reactions Chemistry Reference Resolver Organic Related RSS Feeds Organic Chemistry Info Organic Chemistry Data Website Links to Organic Chemistry Sources Green Organic Chemistry Organic Solvent Data Synthetic Organic Groups

  • How visuospatial thinking boosts chemistry understanding

    Updated: 2024-04-18 06:07:00
    Encourage your students to use their hands to help them get to grips with complex chemistry concepts

  • Mary Watson’s 2023 NOS Lecture is Available On-Line

    Updated: 2024-04-17 15:30:11
    We are now able to release the video of the lecture by Mary Watson (University of Delaware) entitled “Deaminative Cross-Couplings” which was given at the 2023 National Organic Chemistry Symposium (NOS). The 48th NOS was held July 9–13, 2023 on the campus of the University of Notre Dame in South Bend, Indiana. Note, beyond the … Read More The post Mary Watson’s 2023 NOS Lecture is Available On-Line appeared first on ACS Division of Organic Chemistry.

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