Answered
In Chemistry
What is a dissociation?
Dissociation is a chemical phenomenon: splitting of an ioniccompound in ions or radicals. This process is generally reversible.
Results for: Dissociation
Answered
In Chemistry
What is degree of dissociation?
The meaning is the percent (or fraction) of the original moleculedissociated during the process of dissociation.
Answered
In Chemistry
What is oxygen dissociation?
This is the splitting of the diatomic molecule of oxygen(O 2 ) in two oxygen atoms (O).
Answered
In Chemistry
Does HEPES dissociate?
HEPES is a type of zwitterionic organic chemical buffering agent.It is able to dissociate and its dissociation decreases as thetemperature decreases.
Answered
What is auto dissociation?
Autodissociation, or autoionization is the spontaneous separation of molecules into ions . A molecule, or a set of molecules will split up to form a number of positive ch…arged particles ( cations ) and negative charged particles ( anions ). Autodissociation is usually associated with protic solvents ; compounds that can supply protons (H + ions) to stronger bases . Water (H 2 O) undergoes autodissociation. The chemical formula representing this reaction is:2 H 2 O = H 3 O + + OH - or simplified (but a less-correct representation of chemical structures):H 2 O = H + + OH - This is an equilibrium reaction , which means that under ordinary conditions water consists of both H 2 O molecules, and the H 3 O + and OH - ions. The extent of autodissociation of water is very small. This is expressed by the equilibrium constant : K' 25 °C = [H + ][OH - ]/[H 2 O] = (1.0·10 -14 )/55.56 The equilibrium constant indicates that at 25 °C, for every 55.6 moles of water, only 1.0·10 -14 moles are dissociated in the corresponding ions (approximately 1 pair of ions per 5.6·10 15 molecules of water). Since the 55.56 mol/L concentration of water molecules is essentially constant, it is usually omitted. Thus: K 25 °C = [H + ][OH - ] = 1.0·10 -14 mol 2 /L 2 is used. However, the autodissociation constant is only constant for a given temperature , and generally increases for increasing temperature. Autodissociation is not restricted to water alone: many other compounds undergo the same type of reaction:2 HCl = H 2 Cl + + Cl - ( hydrochloric acid )2 HF = H 2 F + + F - ( hydrofluoric acid )2 H 2 SO 4 = H 3 SO 4 + + HSO 4 - ( sulfuric acid )2 NH 3 = NH 4 + + NH 2 - ( Ammonia ) Keep in mind that these simple equations describe only part of the chemical dissociation reactions that occur in reality. For instance, the primary ions observed in water can undergo further solvation reaction to ions such as H 5 O 2 + , H 7 O 3 + , and H 9 O 4 + . (MORE)
Answered
In Chemistry
What is photochemical dissociation?
The meaning of the term dissociation in chemistry is splitting of acompound in ions, radials etc; photochemical dissociation is theprocess performed under irradiation with vis…ible or ultravioletlight. (MORE)
Answered
In Psychology
What is Functional dissociation?
it is hallucinating like when you are dreaming or when you take a psychoactive drug such as acid or mushrooms
Answered
In Uncategorized
What is dissociative reactions?
The role of panic in acute dissociative reactions following trauma. .
Bryant RA, Panasetis P..
Source School of Psychology, University of New South Wales, Sydney, Australi…a. r.bryant@unsw.edu.au.
Abstract OBJECTIVE: 'Peritraumatic dissociation' refers to alterations in awareness and memory for events that occur during and shortly after a traumatic experience. Despite the prevalence of reported peritraumatic dissociation, little is known about the mechanisms that mediate dissociative responses in the initial period after trauma. One theory suggests that peritraumatic dissociation may be a response to elevated arousal and panic symptoms during trauma. This study investigated panic symptoms that occurs at the time of the trauma and their relationship to ongoing dissociation in acute stress disorder. DESIGN: A sample of traumatized people with acute stress disorder or controls were administered a range of psychopathology measures within one month of their trauma. METHOD: Fifty-one civilian trauma survivors with either acute stress disorder or no acute stress disorder were administered the acute stress disorder interview, the Impact of Event Scale, the Beck Anxiety Inventory, the Peritraumatic Dissociative Experiences Questionnaire, and the Physical Reactions Scale to index panic reactions during the trauma. RESULTS: Hierarchical regression analysis found that panic reactions during the trauma accounted for nearly half of the variance (47%) of peritraumatic dissociation, and subsequent stress reactions accounted for an additional 3% of the variance. CONCLUSIONS: These findings are consistent with proposals that acute dissociation is associated with panic symptoms that occur during the traumatic experience. Possible mechanisms for the association of panic and dissociation are discussed..
PMID: 16368028 [PubMed - indexed for MEDLINE] . (MORE)
Answered
In Science
What does the dissociation of water do?
You will find that it will separate into two ions:hydrogen(H + ) and hydroxyl (OH - ).
Answered
In Chemistry
What does water dissociate into-?
H"O dissociates into H+ + OH- . Note that the H+, a proton isactually present in aqueous solution as OH3+, O2H5+ , as itassociates with water molecules which are themselves hy…drogenbonded together (MORE)