What is an advantage and a diasadvantage of manufacturing ethanol by fermentation rather than hydration?
Q. Do NOT include energy consumption or cost! :S Thank you in advance :) :) xx
Asked by Meg G - Fri Mar 11 15:28:35 2011 - Chemistry - 3 Answers - Comments

A. Advantage: The ethanol produced from fermentation comes from a renewable source, which means that this method is more sustainable, but hydration of ethene comes from a non-renewable source, which is not sustainable. Production of ethanol by fermentation is also carbon-neutral. Disadvantage: Production of ethanol by fermentation is much slower and only occurs in batch processes. In comparison, hydration of ethene is a much faster reaction and the process for making it is continuous, so you can keep on making ethanol non-stop, without having to clean everything out and start the process up again after every batch as with fermentation. Hope this helps! :0)
Answered by Charlotte - Fri Mar 11 16:30:24 2011

Ethanol can be made from the fermentation of crops and has been used as a fuel additive to gasoline?
Q. Part A: Write a balanced equation for the combustion of Ethanol. Part B: Find the Delta Hrxn in k J
Asked by shooby - Mon Nov 8 12:47:27 2010 - Alternative Fuel Vehicles - 2 Answers - Comments

A. " C2H5OH + 3 O2 2 CO2 + 3 H2O(l);(DHc = 1371 k J/mol[42]) specific heat = 2.44 k J/(kg K) "
Answered by Breath on the Wind - Mon Nov 8 14:42:02 2010

How do you produce ethanol by fermentation?
Q.
Asked by Matt - Mon Oct 10 13:17:26 2011 - Beer, Wine & Spirits - 1 Answers - Comments

A. The yeast feeds off of the available sugars. Once the fermentation is complete, you need to filter and distill it to separate the ethanol from the "foreshots" (low boiling point compounds such as acetone, methanol, various esters and aldehyde's, and other volatiles) and "heads".( almost pure alcohol, except that they are contaminated with trace amounts of unwanted cogeners ...the stuff that causes hangovers).
Answered by B.E.I. - Mon Oct 10 14:00:41 2011

How much ATP is used up/made with Ethanol Fermentation? How about Lactate Fermentation?
Q.
Asked by goofy - Sat Aug 29 21:02:14 2009 - Biology - 1 Answers - Comments

A. Glycolysis from glucose to pyruvate uses 2 ATP and produces 4, for a net gain of 2 ATP. If the pyruvate is then converted to either lactate or ethanol, no more ATP is involved. But NAD is re-generated, which allows glycolysis to proceed again, making 2 more ATPs.
Answered by Roland - Sat Aug 29 22:12:16 2009

What is the chemical equation of ethanol obtained fom the fermentation of corn and other plant products?
Q. It can be added to gasoline to act as a cheaper altrnative. The standard molar enthalpy of combustion for ethanol is -1.28MJ/mol
Asked by donna n - Sat Oct 21 11:48:28 2006 - Primary & Secondary Education - 3 Answers - Comments

A. C12H22O11 +H2O ---> C6H12O6 +C6H12O6 (sugar) (glucose) (fructose) in presence of enzyme invertase C6H12O6--->2CO2 +2C2H5OH (ethanol) in presence of enzyme zymase
Answered by suvs - Sun Oct 22 14:49:14 2006

The maximum alcohol concentration in the preparation of ethanol by fermentation of grapes or other fruit is?
Q. The maximum alcohol concentration in the preparation of ethanol by fermentation of grapes or other fruit is a. 50-60% b. l2% c. l00% d. 95%
Asked by Jason - Mon Apr 13 14:13:22 2009 - Chemistry - 2 Answers - Comments

A. b) 12%
Answered by Peky - Mon Apr 13 14:18:52 2009

What sort of reactions are the creation of glucose and the fermentation of glucose (-> ethanol)?
Q. The following chemical equations describes the fermentation and creation of glucose. Glucose made by photosynthesis: 6CO2 + 6H2O + light C6H12O6 + 6O2 During the fermentation process glucose is broken down into ethanol and carbon dioxide. C6H12O6 2C2H5OH+ 2CO2 + heat What sort of reaction are these two an example of? (e.g. oxidation, hydrolysis etc)
Asked by Ole Andreas - Fri Jun 12 15:41:22 2009 - Chemistry - 1 Answers - Comments

A. Just for the sake of semantics or rhetoric, I'd venture to say they could classified as saccharidic reactions, or saccharide rxns, though the question itself seems inane and verbose. -Al
Answered by Al U Mann - Fri Jun 12 15:57:35 2009

What are the intermediate and final products of Ethanol and Lactate Fermentation?
Q. thanks
Asked by Chris - Tue Apr 12 18:33:02 2011 - Biology - 1 Answers - Comments

A. Pyruvate - > acetaldehyde -> alcohol Pyruvate - > Lactate via lactate dehydrogenase
Answered by ljkoij - Tue Apr 12 18:34:46 2011

Anyone have an easy formula for a high school student to show ethanol fermentation?
Q. The formula that I have is not working properly. Anyone have an easy to use formula using household items? Thanks
Asked by Luca - Thu Dec 2 16:33:01 2010 - Biology - 1 Answers - Comments

A. Just crush some apples, put them inside a container, pour some water in it, and leave it outside. You can add yeast to accelerate the process, but you can just wait a bit longer and the yeast will naturally arrive. However, I would certainly not recommend you to drink it unless you know how to distill it.
Answered by Maxorz - Thu Dec 2 16:40:14 2010

Fermentation of Ethanol and its effects on Bio Fuel?
Q. So I have to do a research paper on this but im having trouble finding information. So please give me information that you know or a place where I can find information on this. Thanks!
Asked by Megan R - Wed Oct 29 13:55:20 2008 - Biology - 1 Answers - Comments

A. Hm - well to the best of my knowledge ethanol is alcohol but I just did a Wiki search for you and found something you may find useful: googleing "Ethanol and bio fuel" also brings up a variety of websites.
Answered by - Wed Oct 29 14:02:00 2008

Effect of Acid in the Fermentation process in relation to time/ethanol yield?
Q. What, if any, acids have effect on fermentation of yeast? Just a basic experiment. I have read somewhere that they are an optional ingredient but need some reasoning. References are a must, please.
Asked by musiclava15 - Thu Sep 3 05:24:16 2009 - Chemistry - 1 Answers - Comments

A. Lancenigo di Villorba (TV), Italy alcoholic fermentation of sugar-rich broths runs by means of microrganisms in Anaerated Media. Really, there are a very large numbers and class of microrganisms able to take place, so INDUSTRies have to select microrgamisms : usually, it involve yeasts belonging to species named "Saccharomyces Cerevisiae". However, cited species and ohter ones behave depending on medium characteristics, the main ones are temperature, ionic strenght and p H LEVEL. Well, p H affects fermentations because yeasts agree acidic media whilst bacteria llok for mild basicity. sss acidic broths exclude bacterial Activities leading only to yeasts. Moreover, scientists say us that yeasts play fermentation depending on a very… [cont.]
Answered by Zor Prime - Thu Sep 3 06:10:38 2009

During fermentation, yeast cells convert pyruvate to ethanol and CO2. Fermentation also occurs in human muscle?
Q. During fermentation, yeast cells convert pyruvate to ethanol and CO2. Fermentation also occurs in human muscle cells when oxygen is depleted. In the case of muscle cells, what are the byproduct(s) of the fermentation of pyruvate? a)oxygen and ATP b)sugars and proteins c)ethanol and CO2 d)lactic acid e)ATP and NADH i feel like it is C or E am confused
Asked by Lola - Fri Oct 7 16:00:45 2011 - Biology - 3 Answers - Comments

A. It is definitely lactic acid. That's why your muscles ache after strenuous exercise. Lactic acid is broken down by reaction with oxygen, so the best way to relieve the pain is to exercise some more:)
Answered by Andy_Deathstar - Fri Oct 7 16:06:14 2011

What is the effect of addition of ethanol on yeast fermentation?
Q. What happens to the yeast fermentation as we add more ethanol to the yeast with same volume of glucose? Does the volume of CO2 exhaled increase or decrease?
Asked by Haseeb - Thu Oct 28 13:16:38 2010 - Biology - 1 Answers - Comments

A. That's a great question and I am not sure this exactly answers it but check this article out. Its the pros and cons of Ethanol.
Answered by Wazzuno1 - Fri Oct 29 12:56:36 2010

how ethanol is produced by wastewater fermentation?
Q. wastewater that comes from sugar industry can be used to produec ethanol. how??and what is the process flow diagram?
Asked by mona k - Sun Oct 25 11:40:54 2009 - Engineering - 1 Answers - Comments

A. It is the same process as producing it from pure sugar. Wastewater sugar is utilized as a good possibility since it is from 5% to 10% sugar still in the wastewater and sugar converts to ethanol the easiest of any biomass. The only problem with wastewater is the additional water in the process means you have a lot more distillation to be able to concentrate the ethanol to a grade useable to be able to burn. So if you get a cheap source of fuel to get the extra heat for the extra distillation then it is a feasible project
Answered by biire2u - Sun Oct 25 12:08:09 2009

Fermentation and ethanol questions, why does alcohol turn into vinegar?
Q. If you can help me with any of these, that would be great. Thanks. During the fermentation process, why is it impossible to get a soln with an Ethanol concentration of greater than 10-15% without using distillation? Why is it possible to seperate and concentrate ethanol in the mixture during distillation? WHY does alcohol turn into vinegar if it sits too long? And why is ethanol dangerous or toxic to humans?
Asked by Angel Eve - Wed Jan 31 12:00:33 2007 - Chemistry - 2 Answers - Comments

A. 1. Yeasts ferment sugars in the solution to create carbon dioxide and alcohol. When the concentration of alcohol gets too high, it kills off or inactivates the yeast, meaning that you are limited to a low percentage of Et OH. 2. Since water and alcohol have different boiling points, you can fractionally distill the alcohol from the water. Ask me later about azeotropes. 3. The alcohol will oxidize if exposed to air and the correct bacteria. Just as yeast converted sugar to alcohol, certain acetobacteria will convert alcohol to acetic acid. 4. Ethanol is a depressant. Too much will slow down breathing and heart rate, causing unconsciousness or death.
Answered by Frank the Tank - Wed Jan 31 12:18:40 2007

How does the molecular formula of ethanol support ethanol fermentation?
Q. Please answer i need this for a biology lab!! thank you!
Asked by Josh - Wed Mar 10 19:34:41 2010 - Biology - 1 Answers - Comments

A. see the Pearson's chi square test
Answered by Etienne de Quercy - Sun Mar 14 16:39:33 2010

what sugar undergoes fermentation to produce ethanol. What other compound is also formed?
Q. Thanks!
Asked by hector - Wed Mar 18 08:59:59 2009 - Chemistry - 2 Answers - Comments

A. The sugar is glucose and it is broken down to ethanol and carbon dioxide. C6H12O6 2C2H6O + 2CO2
Answered by Other sheep - Wed Mar 18 09:16:08 2009

How is lactate fermentation different and similar to ethanol fermentation?
Q. thanks!
Asked by imsocoolyousuck - Wed Apr 15 18:50:08 2009 - Biology - 3 Answers - Comments

A. Both involve the reduction of pyruvic acid by the NADH produced in glycolysis.This allows the NAD+ to be regenerated and so glycolysis can continue. 2 CH3COCOOH + 4H (from NADH) -> 2 CH3CHOHCOOH (Lactic acid) 2 CH3COCOOH + 4H (from NADH) ->2 C2H5OH + 2 CO2.
Answered by Peter S - Wed Apr 15 18:56:32 2009

Which carbohydrate is best for fermentation (will produce most ethanol)?
Q. How would you figure out which carb produces the most ethanol via fermentation using yeast, with out experimentation?
Asked by Fasfas A - Sun Mar 1 20:58:12 2009 - Biology - 1 Answers - Comments

A. glucose or other hexose, fructose is good, sucrose is best.
Answered by misoma5 - Sun Mar 1 21:54:43 2009

Ethanol Fermentation. Help please?
Q. During Ethanol Fermentation of Yeast, if the sucrose concentration is higher, will it produce more Carbon Dioxide? If two concentrations of sucrose were used, 5% and 10%, which one will produce more Carbon Dioxide? Please say why, I need to compare this to a lab to see if there are any errors. :] Thanks :]
Asked by Nesan Nesann - Sun Oct 30 15:47:33 2011 - Biology - 1 Answers - Comments

A. according to wikipedia: Ethanol fermentation, also referred to as alcoholic fermentation, is a biological process in which sugars such as glucose, fructose, and sucrose are converted into cellular energy and thereby produce ethanol and carbon dioxide as metabolic waste products. so, if you have more sucrose, you're gonna produce more carbon dioxide - it's logical
Answered by bbmm - Sun Oct 30 15:56:06 2011