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Topic: Critical point (chemistry)

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	Theory of Atoms in Molecules: What is a Bond?
		Associated with each such critical point is a set of trajectories that start at infinity and terminate at the critical point, only two of which appear in the symmetry plane shown in the figure.
		The two sets of trajectories associated with such a critical point, a bond critical point, the set that terminates at the critical point and defines the interatomic surface and the pair that originates there and defines the line of maximum density, are shown in Figure 5.
		Further separation of the nuclei causes it to bifurcate into a cage critical point yielding a new structure in which the bridgehead carbon atoms are not bonded to one another, the cage structure depicted in c.
	www.chemistry.mcmaster.ca /faculty/bader/aim/aim_2.html (652 words)

	Critical point (thermodynamics) - Wikipedia, the free encyclopedia
		The critical point in a phase diagram is at the high-temperature extreme of the liquid-gas phase boundary.
		Critical variables are useful for rewriting a varied equation of state into one that applies to all materials.
		The critical point is described by a conformal field theory.
	en.wikipedia.org /wiki/Critical_point_(chemistry) (365 words)

	Supercritical fluid - Wikipedia, the free encyclopedia
		At the critical point, the densities of the equilibrium liquid phase and the saturated vapor phases become equal, resulting in the formation of a single supercritical phase.
		This can be observed in the density-pressure phase diagram for carbon dioxide, as shown in Figure 2, where the critical point is located at 304.1 K and 7.38 MPa (73.8 bar).
		In a practical sense, the area of interest in supercritical fluids for processing and separation purposes is limited to temperatures in the vicinity of the critical point, where large gradients in the physical properties are observed.
	en.wikipedia.org /wiki/Supercritical_fluid (670 words)

	What is Physical Chemistry
		Physical chemistry is also essential for developing and interpreting the modern techniques used to determine the structure and properties of matter, such as new synthetic materials and biological membranes.
		Physical chemistry is the study of the physical basis of phenomena related to the chemical composition and structure of substances.
		Physical chemistry is not so much concerned with the description of chemical substances and their reactions-this is the concern of organic and inorganic chemistry-as with theoretical principles and with quantitative problems.
	www.depauw.edu /acad/chemistry/bgourley/Reseach/what_is_physical_chemistry.htm (1447 words)

	Critical phenomena Summary
		Critical phenomena relates to the physical properties of matter that occur at the phase transition points and specifically at the critical points.
		Critical phenomena include scaling relations among different quantities, power-law divergences of some quantities (such as the magnetic susceptibility in the ferromagnetic phase transition) described by critical exponents, universality, fractal behaviour, ergodicity breaking.
		The critical behavior is often different from the mean-field approximation which is valid away from the phase transition, since the latter neglects correlations, which become increasingly important as the system approaches the critical point where the correlation length diverges.
	www.bookrags.com /Critical_phenomena (1651 words)

	Crystallographic Topology 101 - Overview
		Critical nets are based on the concepts of Morse functions, Morse theory (i.e., critical point analysis), and hyperplane arrangements in topological complexes, which are classic topics in the mathematical topology and global analysis literature.
		Critical points occur where the first derivative of the global density is zero.
		The critical points are best described as representing 0-, 1-, 2-, and 3-dimensional cells in a topological Morse function CW complex (i.e., C for closure finite, W for weak topology).
	www.ornl.gov /sci/ortep/topology/overview.html (2580 words)

	C&EN: COVER STORY - GREEN CHEMISTRY
		The green chemistry conference, which consisted of invited lectures, contributed posters, and discussion groups, was cosponsored by the American Chemical Society and the Green Chemistry Institute (GCI), which formed an alliance with ACS at the beginning of this year.
		The case studies, prepared by chemistry professor Michael C. Cann and undergraduate Marc E. Connelly of the University of Scranton, in Pennsylvania, are based on research that was nominated for or received a Presidential Green Chemistry Challenge Award (CandEN, July 2, page 24).
		Another important event that has rallied proponents of green chemistry was the development of the 12 Principles of Green Chemistry by Anastas and chemistry professor John C. Warner of the University of Massachusetts, Boston.
	pubs.acs.org /cen/coverstory/7929/7929greenchemistry.html (6500 words)

	Crystallographic Topology - Critical Nets 1
		The critical net is composed of interconnected "twisted Hs" with pairs of peaks and pits at the ends of the two inclined non-parallel uprights and a pass and a pale at the ends of the connecting horizontal bar, which is the shortest vector between the two non-parallel uprights.
		Critical nets always maintain a peak-pass-pale-pit vs. pit-pale-pass-peak duality, that is the naming of the critical point sites can be reversed to produce a new valid Morse function.
		The minimum number of critical points possible in a crystallographic unit cell is 8, (i.e., 1,3,3,1) with critical points on the 8 inversion centers of P
	www.ornl.gov /sci/ortep/topology/critnet.html (2573 words)

	Chemistry
		Chemistry is a required course in college for a wide variety of fields.
		It is critical to success in pre-med, pre-vet, nursing, physical therapy, zoology, genetics and other biology careers, some psychology programs, food sciences, and many, many other careers.
		A student interested in the sciences should consider balancing quantitative courses (math, chemistry 3 and 4, physics) and non-quantitative courses (human anatomy and physiology, biology 3 and 4) so that you aren't faced with the prospect of taking math, physics and advanced chemistry at the same time.
	members.tripod.com /macchemistry/index.html (419 words)

	North Carolina Central University :: Department of Chemistry (Site not responding. Last check: 2007-11-01)
		Chemistry requirements consist of completion of a minimum of 32 semester hours in chemistry courses with a cumulative GPA of 2.0 or higher in the chemistry courses.
		Intended for honors chemistry majors to discuss their research activities, to discuss topics of current medicinal chemistry interest, and to interact with faculty and outside medicinal chemists.
		An introduction to fundamental principles of physical chemistry, covering such topics as gases, chemical thermodynamics, thermochemistry, physical and chemical equilibria, solutions, chemical kinetics, electrochemistry, and theory of quantum mechanics and its application to chemistry.
	www.nccu.edu /chemistry/undergradcourses.php (1393 words)

	Lawrence Chemistry Department Curriculum Courses (Site not responding. Last check: 2007-11-01)
		Guided individual and small-group study of selected topics in chemistry, biology, and the biomedical sciences through solving numerical problems embedded within “word stories” drawn very broadly from biological contexts, enabling students with good verbal skills to strengthen their competence and confidence in mathematical, logical, and critical thinking.
		A one-term introduction to chemistry, with emphasis on its basic principles and their application in various contexts of daily life, including the environment, food and nutrition, and the like.
		A one-term treatment of general chemistry designed primarily for freshmen with strong high school backgrounds who are considering a major emphasizing chemistry, biochemistry, or molecular biology; premedical studies; or a 3-2 chemical engineering program.
	www.lawrence.edu /dept/chemistry/coursedescriptions.shtml (1156 words)

	Kenneth Brezinsky (Site not responding. Last check: 2007-11-01)
		Combustion chemistry: The focus is on high temperature gas phase chemical kinetics related to combustion processes with a special emphasis on relevance to environmental impact.
		Accentuated reaction chemistry near the critical point has been postulated as a potential source of these deposits especially in the presence of the types of reactive metal surfaces that exist in the fuel lines.
		Surface enhanced chemistry is being examined in a continuously stirred reactor, and homogeneous fluid phase chemistry in a plug flow reactor.
	www.uic.edu /depts/chme/prof/brezinsky.htm (468 words)

	Science 9-12 Chemistry II
		Chemistry II is a continuation of Chemistry I, but it investigates in greater depth the fundamental makeup of matter, the interactions of matter, and the energy of such interactions.
		This course may be used as the basis for an AP Chemistry class, or it may be taught concurrently with AP Chemistry.
		investigate colligative properties and calculate freezing point depression and boiling point elevation of a solvent when a solute is added to it (given formula and appropriate constants).
	www.state.tn.us /education/ci/cistandards2001/sci/ciscichemistry2.htm (1577 words)

	On the nature of the Møller - Plesset critical point (Site not responding. Last check: 2007-11-01)
		This point is farther from the origin of the z plane than is the critical point for the electron cluster, but it is still close enough to cause divergence of the perturbation series.
		The basis functions centered on the H atom are far enough from the F atom to model the escape of electrons away from the fluorine end of the molecule.
		For the Ar atom a critical point for a one-electron ionization, which was not previously predicted, seems to be present at a positive value of the perturbation parameter.
	www.asergeev.com /files/umassd/singular/nature.htm (293 words)

	Critical pressure and temperature (Site not responding. Last check: 2007-11-01)
		The critical temperature of a liquid is that temperature beyond which the liquid cannot exist, no matter how much pressure is placed on it.
		The pressure that is needed to cause the gas to condense at the critical temperature is the critical pressure.
		On a phase diagram, this point is noted by the ending of the liquid/vapor equilibrium line.
	www.cartage.org.lb /en/themes/sciences/chemistry/Miscellenous/Helpfile/LiquidandSolid/Criticalpressure.htm (201 words)

	East Stroudsburg University - Chemistry
		This course is a study of the concepts of equilibrium, thermodynamics, acid-base chemistry, kinetics, electrochemistry, and nuclear chemistry.
		This course is a study of the periodic properties and descriptive chemistry of the chemical elements and their inorganic compounds, ionic solids, equilibria in aqueous and nonaqueous systems, and acid-base concepts.
		This course is a continuation of CHEM 441 with emphasis on a study of the theories of bonding, structure, and reactivities of inorganic, coordination, and organometallic compounds.
	www3.esu.edu /academics/chemistry03.asp (3217 words)

	World of Chemistry : Glossary (Site not responding. Last check: 2007-11-01)
		Critical mass the mass of fissionable material required to produce a self-sustaining chain reaction.
		Critical reaction (nuclear) a reaction in which exactly one neutron from each fission event causes another fission event, thus sustaining the chain reaction.
		Equivalence point (stoichiometric point) the point in a titration when enough titrant has been added to react exactly with the substance in solution that is being titrated.
	www.classzone.com /books/world_chemistry/page_build.cfm?content=glossary_AG&state=none (2371 words)

	Chemistry Dictionary & Glossary
		In general, critical point is the point on the phase diagram of a two-phase system at which the two coexisting phases have identical properties and therefore represent a single phase.
		At the liquid-gas critical point of a pure substance, the distinction between liquid and gas vanishes, and the vapour pressure curve ends.
		Above the critical temperature it is not possible to liquefy the substance.
	www.ktf-split.hr /glossary/no_en_o.php?def=critical+point (117 words)

	Chapter 3c: The quantum chemical theory Atoms in Molecules (Site not responding. Last check: 2007-11-01)
		This is a saddle point of electron density with a maximum of electron density in 2 directions of space and a minimum in the third one.
		Again this is a saddle point with a maximum in one and a minimum in two directions of space.
		(3, +1) critical point: This point is to be found in the middle of several bonds forming a ring.
	www.cryst.bbk.ac.uk /PPS2/projects/loesel/chap03c.htm (690 words)

	Re: Liquid oxygen/nitrogen stored 120/40 psi, gaseous stored 3000 psi; why/how?
		The critical point of oxygen is at about 155 K and 5 MPa.
		The critical point of nitrogen is at about 126 K and 3.4 MPa.
		The normal boiling points (temperature at which the vapor pressure is one atmosphere) are about 90 K and 77 K for oxygen and nitrogen, respectively.
	www.madsci.org /posts/archives/may97/861800153.Ch.r.html (681 words)

	Research\|Penn State: The Critical Point
		Instead, near the critical point, the densities of the two phases are fluctuating wildly.
		At the critical point their scale reaches a length of 4000 angstroms—which just happens to match the wavelength of visible light.
		Not only that, but critical points, with their unusual properties, are not limited to the liquid-to-vapor shift.
	www.rps.psu.edu /0105/critical.html (2119 words)

	Phase Diagrams (Site not responding. Last check: 2007-11-01)
		The line ends at the critical temperature and pressure of the substance, beyond which the there is no difference between the liquid and gaseous phases.
		The three lines meet at the triple point of the material.
		Solution: The point marked A on the phase diagram is in the solid region, so the substance begins as a solid.
	www.cartage.org.lb /en/themes/Sciences/Chemistry/Miscellenous/Helpfile/LiquidandSolid/PhaseDiagrams/PhaseDiagrams.htm (338 words)

	SparkNotes: SAT Chemistry: Phase Changes
		The intersection of all three lines is known as the triple point (represented by a dot and a T on the figure).
		Point X represents the critical point, and at the critical point and beyond, the substance is forever in the vapor phase.
		On the SAT II Chemistry test, you might see a diagram that looks something like this one, and you might come across a question that asks you to calculate the amount of energy needed to take a particular substance through a phase change.
	www.sparknotes.com /testprep/books/sat2/chemistry/chapter5section5.rhtml (1003 words)

	McKendree College - Chemistry
		To major in chemistry, the student must complete the requirements listed below for the bachelor of science degree, maintaining a 2.25 cumulative grade point average for the chemistry, mathematics, and physics components.
		This course is a study of the structure and nomenclature, and the physical and chemical properties of the hydrocarbons and their derivatives.
		A continuation of Chemistry 305 discussing theories of chemical bonding and molecular structure, spectroscopy, chemical kinetics, quantum mechanics, and molecular energies.The laboratory component includes laser methods to confirm the predictions of quantum mechanics about chemical bonding and molecular energy levels.
	www.mckendree.edu /current/Chemistry06.aspx (1536 words)

	AACC - Critical and Point of Care Testing Awards (Site not responding. Last check: 2007-11-01)
		President of the national clinical chemistry society organizing the conference should contact the chair of the CPOCT Division for this award.
		Given in recognition of the outstanding research in the areas of critical and point of care testing per abstract submitted and poster presented at the AACC annual meeting.
		Given in recognition of the outstanding research in the areas of critical and point of acre testing per abstract submitted and poster presented at the CPOCT international symposium.
	www.aacc.org /divisions/cpoct/awards.stm (550 words)

	Chemistry Mission Statement (Site not responding. Last check: 2007-11-01)
		As reformed Christians working in chemistry, we acknowledge God as creator and sustainer of all areas of life [2], recognizing His revelation not only in scripture but also in His creation [3].
		In obedience to our Lord's call to make new the creation, to serve others, and to glorify God, the Chemistry Department seeks to develop analytical, critical, imaginative, and stewardly serviceable insight in the discipline of chemistry, its philosophical foundations, and its impact on the creation.
		Students will be able to describe and explain biblical principles which shape a normative understanding of the place and role of chemistry as a science.
	www.dordt.edu /academics/departments/chemistry/chemistry_mission.shtml (1058 words)

	[No title] (Site not responding. Last check: 2007-11-01)
		You should be able to relate differences in the strengths of intermolecular attractions to relative values of the following properties: critical temperature, rate of evaporation and vapor pressure at a given temperature, normal boiling point, heat of vaporization, surface tension, viscosity, normal melting point, heat of fusion.
		You should understand the process of evaporation and be able to explain the dependence of the rate of evaporation on temperature, the cooling effect of evaporation, the dependence of vapor pressure on temperature, and the dependence of boiling point on pressure.
		You should be able to interpret a simple phase diagram (including identification of critical point, triple point, boiling points, freezing points, the phase or phases which will be stable at a given temperature and pressure, and the phase change(s) which will occur when the temperature and/or pressure are changed in a specified manner).
	www.utm.edu /departments/cens/chemistry/Old_Site/Chap11.htm (291 words)

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