What is Dissociation: Definition and 84 Discussions

Dissociation, as a concept that has been developed over time, is any of a wide array of experiences, ranging from a mild emotional detachment from the immediate surroundings, to a more severe disconnection from physical and emotional experiences. The major characteristic of all dissociative phenomena involves a detachment from reality, rather than a loss of reality as in psychosis.The phenomena are diagnosable under the DSM-5 as a group of disorders as well as a symptom of other disorders through various diagnostic tools. Its cause is believed to be related to neurobiological mechanisms, trauma, anxiety, and psychoactive drugs. Research has further related it to suggestibility, hypnosis, and it is inversely related to mindfulness, which is a potential treatment.

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  1. E

    Vibrational Vs dissociation energies for diatomic molecules

    If a diatomic molecule's vibrational energy is increased to the dissociation energy of that molecule, will that cause the molecule to rip itself apart? Is it the change in vibrational energy that causes the molecule to dissociate?
  2. S

    Why does the oxygen atom in H3O+ have a positive formal charge?

    Acid dissociates in water to form H3O+ and OH- but the formal charge on the oxygen atom in H3O+ is +1. Shouldn't the oxygen atom have a negative formal charge since it is more electronegative than hydrogen atom?
  3. P

    O-H Bonding (and ion dissociation)

    This is probably something I should know, but I don't want to wait and ask my professor. In the combustion of H2, assuming O2 is plentiful enough not to be a limiting reactant, H2O forms as a result of the O-H bond being more stable than the bonds between two H or two O. Is this due to the...
  4. L

    Dissociation Constant of Weak Acids

    Homework Statement In my lab, it says that i have to calculate the pH and the Ka of an unknown acid of known concentration (0.20 mol/L)..however, the part that is confusing me is that we first had to obtain 40 mL of that particular unknown acid... Homework Equations The Attempt at a...
  5. wolram

    Medical Is Dissociation from Child Abuse Common and Harmful?

    Has anyone heard of this, is it bad?
  6. W

    Minimum Photon Energy for Deuteron Dissociation

    Another Nuclear Physics problem: Minimum photon energy for deuteron dissociation Homework Statement What is the minimum photon energy necessary to dissociate a deuteron. Take the binding energy to be 2.224589 MeV Homework Equations \gamma + 2H \rightarrow 1H + n \vec{P} = \vec{P_n}...
  7. C

    Phenol Dissociation: O-H Bond Weaker?

    Hi, my teacher told me that the oxygen in phenol would be delocalized into the benzene ring's electron and thus, making the O-H bond weaker, thus easing the release of the H proton. But i would like to know, since a benzene consist of 3 double bonds, shouldn't the electrons from the benzene...
  8. H

    Dissociation constant from absorbance

    Homework Statement A 0.120 M solution of sodium picrate ina 1 M sodium hydroxide solution was observed to have an absorbance of 0.335, due only to the absorption by the picrate anion. In the same spectrophotometer cell and at the same wavelength as in the previous measurement, a 0.300 M...
  9. H

    Calculating Spectroscopic Dissociation Energy for 127-I2 Molecule

    Homework Statement The spectroscopic dissociation energy of 127-I2 is 1.542eV. What wavelength of light would be needed to dissociate the molecule and have the atoms move apart at velocities of 1000 m/s? Homework Equations The Attempt at a Solution What I did was convert 1.542eV...
  10. B

    Water Electrolysis and Water Dissociation with RF waves

    THIS IS NOT A HOMEWORK QUESTION. As Physicist of course I'm sure you've heard about the water dissociation with Radio waves that john kanzius discovered and I have a few questions on my mind listed below 1) What is the difference between this phenomenon and water electrolysis? Is it true...
  11. H

    Molecular Properties: PL and Acid Dissociation Constant

    what is the pl of a molecule? What is the acid dissociation constant? Thanks in advance for any replies
  12. X

    Can UVC Light and Electrolysis Efficiently Split Water?

    I'm working on a project to split water. The idea is to have a spherical container of aluminum with the inside given a mirror finish. A germicidal light is secured inside and the container is filled with water. The UVC light should have enough energy to break the bonds (although I searched...
  13. C

    Detemination of dissociation constants of weak acid

    Procedure: 1. Pipette 25 cm3 of ethanoic acid into a conical flask 2. Titrate against 0.1M sodium hydroxide solution in the burrette, using phenolphthalein as indicator. 3. Pipette further 25 cm3 of ethanoic acid into the solution after titration and mix throughly. Questions: 1. what is...
  14. K

    Calculate the value of Kc for the dissociation reaction

    [SOLVED] need help At 77°C, 2 mols of nitrosyl bromide, NOBr, placed in a 1 liter flask dissociates to the extent of 9.4%; that is, for each mol of NOBr before reaction, (1.000-0.094) mol NOBr remains after dissociation. Calculate the value of Kc for the dissociation reaction. 2NOBr (g) =...
  15. H

    Chemistry-Equilbibrium of NH4HS dissociation

    Homework Statement I am having trouble with this question can anyone point me in the right direction? Solid NH4HS dissociates according to the equation: NH4HS (s) ---> NH3 (g) + H2S (g) SOme solid NH4HS is placed into an initially evacuated vessel and when equilibrium is established there is...
  16. G

    Understanding Dissociation Energy: O2+ vs O2

    I am having some trouble understanding this concept. I get that the dissociation energy for N2 is much greater than N2+ because of the triple bond, which makes a stronger bond, and therefore it is harder to remove one bond, compared to N2+ where it is easier to remove the bond because of one...
  17. Amith2006

    Dissociation of deuteron by gamma rays

    Homework Statement I have a doubt in the following problem. I get an answer which is slightly different from the book answer. 1) A 6 MeV gamma ray is absorbed and dissociates a deuteron into a proton and a neutron. If the neutron makes an angle of 90 degrees with the direction of gamma ray...
  18. G

    Calculate Percent Dissociation of HBrO

    Here is what should be an easy problem that I am somehow messing up Homework Statement Calculate the percent dissociation of 0.063 M Hydrobromous acid, HBrO. Do not solve the quadratic equation even if the percent dissociation is high. Homework Equations The Attempt at a...
  19. A

    How Do You Calculate the Acid Dissociation Constant?

    A 0.1 mol/L aqueous solution of weak monoprotic acid (contains one ionizable hydrogen atom) has a hydrogen ion concentration of 0.001mol/L. The value of Ka is: a) 10-6 b) 10-2 c) 10-3 d) 10-5 I took 0.001 and divided by 0.1 to get 10-2 and I also multiplied them together to get 10-5...
  20. J

    Dissociation of H2O due to Photon energy.

    I can't figure out how to do this question: Given that the rate of energetic photons is striking Venus at about 10^30 per second and the age of the solar system is about 10^17 seconds, estimate the total mass of water that could have been lost from Venus since it formed. Th mass of a water...
  21. Y

    Dissociation Constant Homework Check

    Question: A solution of hydrofluoric acid contains 2.0g of HF per litre and has a pH of 2.2. What is the dissociation constant for HF? My Answer: HF + H2O <-> H3O+ + F- HF = 2.0g H30+ = 10^-2.2 = .0063g F- = H3O = .0063 Ka = [H3O+][F-] / HF = (.0063)(.0063) / 2.0 =1.98 x 10^-5...
  22. P

    Acid dissociation constant thermicity

    The acid dissociation constant as an equilibrium constant is affected by temperature. Right? Thus, could someone tell me if the reaction between a general acid and water: HA(aq) + H2O(l) ⇌ A-(aq) + H3O+(aq) is exothermic or endothermic? I think it is endothermic by similiarity with water...
  23. F

    Bond Dissociation Energies (BDE) help, please

    Well, I'm working on a lab report for my general chemistry class, and we're supposed to answer questions on bond dissociation energies, but we never even discussed that during the lecture. I cannot find any information on it in my textbook, and I am really lost on how to answer these questions...
  24. S

    How Do You Calculate pOH and Ka for Acid Solutions?

    1. A bottle of strong monoprotic acid was labelled as having a concentration of 2.040 x 10-1 mol/L. Given that KW = 1.00 x 10-14, determine the p0H of the acid solution. [H3O+][OH-]= K_w [OH-] = k_W/[H3O+] = (1.00*10^-14)/(2.040*10^-1 M) = 4.90196078E-14 -log[OH-] = pOH...
  25. S

    PH and the Acid Dissociation Constant

    1. What is the hydronium ion concentration and the pH for an aqueous solution of NH3 that has a hydroxide ion concentration of 2.25E-3 M? a. 4.44 x 10-11 M, 3.65 b. 4.44 x 10-11 M, 10.35 c. 4.44 x 10-12 M, 2.65 d. 4.44 x 10-12 M, 11.35 [OH] = 2.25E-3 pOH = -log(2.25E-3) = 2.6478...
  26. S

    Calculate Degree of Dissociation & pH of 0.1M Propionic Acid

    Hi Guys! Dissociation constant of propionic acid at 25 degree celsius is 1.34 x 10^-5. Calculate the degree of dissociation and pH om 0.1M acid. Ans: degree of dissociation=0.115 pH=2.93 now my dear friends i have calculated the pH already from the formual correctly. Now...
  27. A

    What is the Correct Calculation for the Dissociation of Glycine with 5M KOH?

    Here's the problem how much of 5M KOH should be added to 1L of 0.1M glycine(pKa=9.6) at a pH of 9 until the pH reaches exactly 10? the answer in the back says 10mL. R-NH3(+) <-> R-NH2 + H(+) Here's the way I solved it. I figured out the number of moles of R-NH2 using the...
  28. C

    What is the dissociation constant for hydroflouric acid?

    I understand this tells us how strongly binded a solution is. So I hve hydroflouric acid, it says it contains 2.0g of HF per litre and has a PH of 2.2. How do I figure what the dissociation constant for HF is? Thanks
  29. quasar987

    Dissociation Field: Estimating Magnitude of N_2

    dissociation field ?!? The average distance between the atomic components of a simple molecule is of the order of a few Angström. Estimate the magnitude of the field necessary to dissociate a molecule of N_2. With no other information, is it possible to solve this ?!? We have a little...
  30. R

    What is the pH of a solution containing 50 grams of Na3PO4?

    I think that is what you call it. I need to find the pH of a solution containing 50 grams of Na3PO4. 50 g ---- > 0.305 M We know that Kw=Ka*Kb So, Na3PO4 + H20 --> HNa3PO4 + OH (I think) Kb = x^2/(.305-x) I can't find the value of Kb anywhere in my book, internet. If I had it I...
  31. G

    Bond Dissociation Energy of 2Cl: 58 kcal/mole

    Given: Cl2 = 58 kcal/mole ------> 2cl 1. 58 kcal/mole is the bond dissociation energy T F 2. 58 kcal/mole is an entropy term T F 3. this reactin is endothermic T F I don't understand get it! Any help woud be appreciated.
  32. J

    Methanoic Acid's dissociation constant

    I need some help with these, anyone point me in the right direction please? The pH of 0.04moldm-3 methanoic acid, HCOOH, is 2.59 at 25 celsius. Calculate the acid dissociation constant at this temperature Given that the ionic product of water is 1.0 times 10^-14 mol2dm-6 at 298K...
  33. B

    How do we use UV values in spectral analysis to identify molecules?

    Wavelengths and dissociation?? I needed some help with this problem. By using photons of specific wavelengths, chemists can dissociate gaseous HI to produce H atoms with accurately known speeds. When HI dissociates, the H atoms move away rapidly, wheras the relatively heavy I atoms move...
  34. G

    Cardiac Cycle, Tissue Fluid and Oxygen Dissociation Curve

    Hello people I am currently having problems doing my AS exam paper. Can you please help? The question is: During the cardiac cycle, the pressure in the left ventricle falls to a much lower level than in the aorta. Give an explanation for this difference? I have no idea about this...
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