
	Where results make sense

Topic: Boiling chip

Related Topics

boiling point

Hard Boiled

Boiled pasta

boiling water reactor

Boiling Springs

Boiled potatoes

hard boiled detective

Red Boiling Springs, Tennessee

boiling delay

boiling oil

Red Boiling Springs

Boiling Spring Lakes, North Carolina

In the News (Thu 16 Feb 12)

EXECUTIVE POWER

Iran

ANALYSIS

Pakistan

Family compact

	Distillation (Site not responding. Last check: 2007-10-14)
		The normal boiling point of a liquid is the temperature at which the vapor pressure of a liquid equals atmospheric pressure (1 atm or 760 Torr).
		The boiling point of pure A is 74ºC; the boiling point of B is 69ºC. There is a particular mixture shown in the diagram (19% A and 81% B) for which the composition of vapor and liquid in equilibrium are identical.
		Ethanol boils at 78.5ºC and water boils at 100ºC; a 95.6% ethanol-4.4% water mixture boils at 78.2ºC. It is because of this azeotrope that one cannot distill ethanol off at a concentration higher than 95.6% (191.2 proof is the maximum attainable by distillation).
	www.uwlax.edu /faculty/koster/Distillation305.htm (3070 words)

	boiling chips (Site not responding. Last check: 2007-10-14)
		Boiling chips are small, insoluble, porous stones made of calcium carbonate or silicon carbide.
		When a boiling chip is heated in a solvent, it releases tiny bubbles.
		Boiling chips cannot be re-used since the pores inside these stones become filled with liquid on cooling.
	orgchem.colorado.edu /hndbksupport/dist/boilchip.html (134 words)

	Chips - Uncyclopedia
		Chips are healthy snacks made from silicon or less often germanium, invented by one of Demi Moore's uncles: Gordon Moore.
		Chocolate chips, corn chips, cow chips, chips on various peoples' shoulders, and ham chips (conversely known as 'chipped ham') are frequent fillers favored by Jerry but not necessarily Ben.
		Chip speeds are often the hub of advertisement, this relates to the speed at which they're ingested.
	uncyclopedia.org /wiki/Chips (784 words)

	Electronics Cooling: direct liquid immersion cooling for high power density microelectronics (Site not responding. Last check: 2007-10-14)
		Boiling: Boiling is a complex convective heat transfer process depending upon liquid-to-vapor phase change by the formation of vapor bubbles at the heated surface.
		It is commonly characterized as either pool boiling (occurring in a stagnant liquid) or flow boiling.
		Using this approach, it was possible to cool 4 W chips (4.6 mm x 4.6 mm) and module powers up to 300 W. Direct liquid immersion cooling has been used within IBM for over 20 years, as a means to cool high powered chips on multi-chip substrates during electrical testing prior to final module assembly.
	www.electronics-cooling.com /Resources/EC_Articles/MAY96/may96_04.htm (2377 words)

	Boiling Points
		We define a "normal" boiling point as the boiling point of the liquid at 1 atm, or another way of saying this is that the "normal" boiling point is the temperature at which the liquid's vapor pressure is equal to 1 atm.
		Because the boiling point of water is about 90 degrees C at this altitude., not only will our camper find that his food will cook a little slower than normal, any attempt to boil water to kill germs and pathogens may be unsuccessful since the water isn't getting hot enough.
		Boiling chips are small, insoluble, stones made of calcium carbonate, silicon carbide, or carbon (crushed coal) just to name a few.
	www.heartmagic.com /zzBoilingPoints.html (1660 words)

	Colligative Properties of Solutions
		When water is the solvent, the boiling point of water will increase 0.512C for each 76 grams of propylene glycol (antifreeze) added to 1000 grams of water.
		Boiling points of water-antifreeze solutions are easy to determine in a laboratory and require minimal equipment, although students need to be extremely careful.
		Measure the boiling point by recording the temperature at which the liquid first starts to boil.
	www.usoe.k12.ut.us /curr/science/core/plans/antifreez.html (1235 words)

	Sample Lab Write-Up
		This results in an increase in the kinetic energy of the molecules causing the equilibrium to shift in the favor of the vapor phase, thus increasing the vapor pressure.
		A normal boiling point is defined for a total pressure of 1 atm or 760 torr (mm of Hg).
		Impurities either raise or lower the observed boiling point of a liquid depending on how the impurities interact with the compound whose boiling point is being measured.
	www.chem.sc.edu /faculty/handy/Samlab.htm (400 words)

	Engineer creates a new tool for keeping computers cool
		The key, he says, is that when it contacts the chip, the coolant mimics a boiling liquid - one of the most efficient and widely used means to remove heat - while avoiding the problems true boiling can cause.
		Computer chips can produce the same 100 watts of thermal energy as the bulb, but that energy is concentrated in a much tinier area.
		By replacing a computer chip with a plate of transparent Plexiglas and visualizing the flow with microscopic techniques, they observed deep ridges of liquid forming in areas where sprays from adjacent nozzles streamed into one another.
	www.physorg.com /news5087.html (1189 words)

	Recrystallization (Site not responding. Last check: 2007-10-14)
		For example, if you wanted to purify a sample of Compound X which is contaminated by a small amount of Compound Y, an appropriate solvent would be one in which all of Compound Y dissolved at room temperature because the impurities will stay in solution and pass through filter paper, leaving only pure crystals behind.
		Add a small portion of boiling solvent to the beaker that contains the impure sample and a boiling chip.
		If the solution is not the expected color, remove the boiling solution from the heat and allow it to cool to beneath the boiling point of the solvent.
	wulfenite.fandm.edu /labtech/recryst.htm (1088 words)

	Chem 197 - Luminol Synthesis
		Insert a thermometer in the sand bath, add a boiling chip, and an aspirator tube connected to an aspirator.
		Boil the solution vigorously to distill the excess water (110-130 °).
		Heat to the boiling point, stir, and keep the mixture hot for 5 min, during which time some of the reduction product may separate.
	cas.bellarmine.edu /chem117a/lab/luminol.htm (782 words)

	Untitled Document (Site not responding. Last check: 2007-10-14)
		These tiny boiling chips are very porous rocks which release bubbles of entrapped air to the solution being heated.
		These bubbles provide a path by which the vapour of the boiling liquid can be smoothly led to the surface and released.
		It should be noted here that a boiling chip may not be used twice; it must never be added to a hot solution (near its boiling point) since violent frothing will occur.
	www.chem.ubc.ca /courseware/235/danalabsess/boiling_chip.html (81 words)

	049 Micro-Distillation Lab
		Consequently, boiling points are different for different compounds.
		Place a micro boiling chip (marble chip the size of a rice grain) into boiling pot.
		Push the bulb of a thermometer into the hole in the shoulder of the boiling pot, the fit should be snug and air tight.
	dwb.unl.edu /chemistry/beckerdemos/BD049c.html (1557 words)

	The MSDS HyperGlossary: CHIP
		CHIP has been amended on a regular basis since it was first adopted as the Chemicals (Hazard Information and Packaging for Supply) Regulations in 1994.
		CHIP also defines classes of danger for "substances and preparations dangerous for supply" and uses a letter coding system for these classes.
		Liquid substances and preparations having an extremely low flash point and a low boiling point and gaseous substances and preparations which are flammable in contact with air at ambient temperature and pressure.
	www.ilpi.com /msds/ref/chip.html (1023 words)

	[No title]
		The boiling point can be used to estimate the approximate number of carbons in the compound and further narrow the possibilities.
		Crush a boiling chip with a pair of pliers and insert a stone small enough to also fall to the bottom.
		Because some compounds boil at a high temperature it is best to use a copper plate on the hot plate to insure that you can achieve the temperature at which the unknown boils.
	wwwchem.csustan.edu /CHEM3012/Alc-AlkHal-Alkene.htm (2518 words)

	Boiling chip - Wikipedia, the free encyclopedia
		Without boiling chips, a liquid heated in a smooth container can become superheated and "bump" in a sudden, sometimes violent release of vapor.
		This sudden burp of gas can cause the solution and reagents to be thrown out of the container, possibly causing severe burns, ruining an experiment, or simply making a mess.
		In school laboratories, pieces of broken ceramic crucibles are often used.
	en.wikipedia.org /wiki/Boiling_chip (218 words)

	Ferrocene Acylation
		Heat the reaction tube in a boiling water bath, with stirring, to dissolve the ferrocene.
		Continue heating in the boiling water bath for an additional ten minutes, and then thoroughly cool the tube in an ice-water bath.
		Carefully remove the hexane from the ferrocene and the hexane/t-butyl methyl ether from the acetylferrocene using a hot plate.
	www.bradley.edu /las/chm/Course/351/FerroProc.htm (771 words)

	CR-Scientific: Catalog: Teflon® high purity PTFE Boiling Stones (Boiling Chips)
		Ultra-pure Teflon®; boiling stones (boiling chips) are of highest purity PTFE and are exceptionally resistant to chemical attack.
		Boiling chips are required to reduce the danger of "bumping" when heating liquids in test tubes and other narrow vessels; these chips are highly recommended in other boiling operations as well.
		Since the chips are of different sizes, you may find it helpful to select the smaller ones for more narrow test tubes (such as 10x75 mm).
	www.crscientific.com /boilingstones.html (228 words)

	Fractional distillation - Wikipedia, the free encyclopedia
		Fractional distillation is the separation of a mixture into its component parts, or fractions, such as in separating chemical compounds by their boiling point by heating them to a temperature at which several fractions of the compound will evaporate.
		If the difference in boiling points is greater than 25°C, a simple distillation is used.
		Ethanol boils at 78.5 °C while water boils at 100 °C. So, by gently heating the mixture, the most volatile component will concentrate to a greater degree in the vapor leaving the liquid.
	en.wikipedia.org /wiki/Fractional_distillation (1390 words)

	Caffeine Analysis
		During boiling, gently stir the bags about in the hot solution taking care to not puncture them.
		Transfer the filtrate to your (cleaned) 800 mL beaker and concentrate it by boiling to a volume of approximately 50 mL.
		Add boiling chip, use a hot water bath, and boil off the chloroform in the hood.
	www.newton.dep.anl.gov /askasci/chem00/chem00291.htm (604 words)

	Picrates
		A boiling chip is added and the solution is heated to boiling on a steam bath.
		Filter off the precipitated picrate and recrystallize it from boiling water, alcohol or dilute alcohol, boiling 10 per cent.
		The method described by Vogel may be a better procedure for heat sensitive amines, since the only heating step is after formation of the picrate and even then, by use of MeOH, temperatures could remain relatively low.
	users.lycaeum.org /~desoxy/Reagderiv.htm (604 words)

	New Page 3 (Site not responding. Last check: 2007-10-14)
		We prepared a reflux condenser and attached the flask and boiled the solution for 15 minutes, making sure to swirl the flask to dissolve all solids.
		After boiling we allowed the mixture to cool to room temperature, after cooling we collected the crystals from the mixture with a Buchner funnel.
		The boiling process of the experiment included the mixture turning a dark purple color, however our mixture and other classmates’ solution was mostly fl, with no distinguishable purple color.
	home.elp.rr.com /jaguilera/Tetraphenylcyclopentadienone.htm (242 words)

	4e3b
		The boiling point of a mixture of immiscible liquids is lower than the boiling points of the individual components.
		When water (steam) is one of the components of an immiscible liquid mixture, this process is known as steam distillation.
		The outcome of steam distillation is a codistilled mixture of water and immiscible components.
	online.sfsu.edu /~meden/COURSES/Chem_334/c334expts/4e3mb04.htm (488 words)

	Chem2O06 - 1997/98 - Experiment 3: Procedures
		The boiling aid which prevents "bumping" due to superheating, is an inert material with small pores which provide sites where bubbles can form, thus inducing even boiling.
		The new chip should not be added when the liquid is at or near the boiling point, as this may initiate violent boiling.
		As the table is being filled out, plot the boiling point vs. volume distilled for the distillation of the cyclohexane/p-xylene mixture with and without the fractionating column.
	www.chemistry.mcmaster.ca /~chem2o6/labmanual/expt3/exp3-p.html (905 words)

	Macroscale Fractional Distillation
		Add 25 mL of the toluene:cyclohexane mixture and a boiling chip to a 50 mL round bottom flask.
		Assemble a fractional distillation apparatus as shown in Figure 10.11, using a clean, dry 10 mL graduated cylinder as the receiver.
		Heat the mixture to boiling at a rate which causes the reflux ring to advance, but not so fast as to flood the column.
	www.sou.edu /chem/ch338/DIST'N.htm (367 words)

	[No title] (Site not responding. Last check: 2007-10-14)
		Use boiling chip in the flask to help the liquid boil smoothly.
		Combine 12 mL of hexane (boiling point = 68.7 °C) and 18 mL of toluene (boiling point = 110 °C), to give an initial mixture having a 40/60 composition of hexane/toluene, in a 50 mL round-bottom flask.
		Heat just enough to first wet the bulb of the thermometer and then to raise the level of the liquid in the distilling head to permit it and the accompanying vapors to move into the condenser.
	www.missouri.edu /~chemrg/2050f05/Expt3_pre_lab.doc (586 words)

	Acetyl Chloride, Acetic anhydride and Propionic Anhydride
		Collect separately in a dry receiver the portion boiling at 50-56°C and transfer it to a dry weighed glass-stoppered bottle.
		The crude anhydrie (310 g) is redistilled under normal pressure, and the fraction boiling between 134-138 C is collected.
		The RBF is then equipped w/a reflux condenser and gently heated on a water bath to ~80-85°C. As soon as the rxn starts, the heating is removed, and in case the rxn gets too vigorous it's cooled w/cold water.
	www.erowid.org /archive/rhodium/chemistry/anhydrides.html (1706 words)

	333 Lab Procedures
		Place a boiling stone in the test tube and heat the solution to boiling on a sand bath.
		Plot boiling point vs. volume of distillate (temperature as a function of volume).
		While the next fraction is draining, boil the fraction in the flask on a sand bath until all liquid has evaporated and determine if there is any residue.
	www.chem.sc.edu /faculty/handy/333labproc.htm (3968 words)

	Organic Chemistry Laboratory at CSU Stanislaus (Site not responding. Last check: 2007-10-14)
		Analysis of the Product: Evaporate the dichloromethane gently on the steam bath (use a boiling splinter until the liquid can no longer bump.) Once the dichloromethane has been definitely removed make a final note of the odor of the product.
		Determine the weight of the ester and its boiling point and calculate the percent yield of theoretical (set up the calculation in a Reaction Table).
		Place 2.0 g of methyl benzoate, 20 mL of 2 M NaOH, and a boiling chip in a 50 mL round bottom flask and attach a condenser with circulating cold water.
	wwwchem.csustan.edu /chem3022/esters.htm (608 words)

	[No title] (Site not responding. Last check: 2007-10-14)
		Solid impurities (sand, organic "junk", etc.) and liquid impurities having quite different boiling points are most easily removed by distillation, but even liquids having similar boiling points can be separated.
		to distill, and use either a boiling chip or a magnetic stirring bar in the flask to help the liquid boil smoothly.
		A condenser is fitted onto the outlet of the distillation head - use cooling water for samples that have boiling points below 150 degrees C. An adapter attached to the end of the condenser allows you to collect the distilled liquid as it drips from the distillation apparatus.
	www.missouri.edu /~chemrg/2050f05/E3_Distillation.doc (1062 words)

Try your search on: Qwika (all wikis)