Check frequently asked questions about Benzene

Open Question: Acid base reaction. how to know acids from bases in organic chemistry.?

I have a benzene ring with an amine NHH, and then I have a benzene ring and has attached a CO2H. WHich one is acid which is base and why?

9 Mar 2010, 6:18 am | click here for answers

Open Question: what steps would be taken to make 2-nitro-benzoic acid from 2 nitro methyl benzene?

9 Mar 2010, 5:49 am | click here for answers

Open Question: Another chemistry question...?

The vapor pressure of pure benzene and toluene at 25 degrees C are 95.1 and 28.4 mm Hg respectively. Asolution is prepared in which the mole fractions of benzene and toluene are both .500. What are the partial pressures of the benzene and toluene over the solution? What is the total vapor pressure? Please explain to me how to do this and also provide the correct answers. Thanks so much!!

9 Mar 2010, 5:17 am | click here for answers

Open Question: Calculate the mass in grams of hydrogen present in 2.550 g of each of the following compounds.?

1. benzene, C6H6 2. calcium hydride, CaH2 3. ethyl alcohol, C2H5OH 4. serine, C3H7O4N

8 Mar 2010, 9:51 pm | click here for answers

Open Question: organic chemistry acidity, HELP!?

there are three molecules, and the pka is gradually increasing, the first structure is a benzene ring with an OH group on top and NO2+ on the bottom (pka=7.2). The second structure has a pka of 9.9, and it has a benzene ring only with an OH group on top, and the last structure with a pka of 17, has a benzene ring, with every single bonds, no double bonds at every, similar to cyclohexane, with an OH group on top. The question asks, explain the trend? I know it has something to do with delocalization, and resonance structures, ect, but not sure how exactly to explain. Please help.

8 Mar 2010, 9:43 am | click here for answers

Open Question: Phenylmagnesium bromide when purposely treated with D2O produces mono deuterated benzene as the product.?

Explain how this reaction is illustration of the basic nature of a grignard reagent.

8 Mar 2010, 8:56 pm | click here for answers

Open Question: calculate the molar mass of iron oxide Fe2O3, in grams. Show work?

1. Calculate the percentage, by weight, of each of the elements (Fe, O) in iron oxided. Show work 2. What is the emprical formula for a. C6H6 (benzene) b. C2H4O2 (acetic acid) c. C3H6N3O9 (nitroglycerin)

8 Mar 2010, 8:45 pm | click here for answers

Open Question: Which one has the highest polarity: benzene, naphthalene or anthracene?

8 Mar 2010, 7:06 pm | click here for answers

Resolved Question: Where to go fron here?

I have just realized that i have been being slowly poisoned for 5 years! The story began in 2005 when i moved in to my current residence. I signed my tenancy on 7/7/05, on 25/10/05 i reported a horid odor in the kitchen coming from below the boiler. The housing association sent out a contractor....he determined that the horrid odor was coming from the old drain pipe from the boiler. This pipe was poking up through the worktop...the odor was coming from there. He got some electrical tape and taped up over the pipe. Nothing further was logged as the contractor obviously did not think it was a problem. I have suffered from severe nausea since i moved into the property. My medical history clearly show i was fine up until the end of 2005...and sick up until dec 2009. My doctor has been stumped at why no matter what " Anti depressant " she puts me on i continue to feel sick. I have been on 20+ anti depressants, beta blockers, sleeping tablets, anti sickness tablets, IBS tablets...none helped the nausea. 25th Feb 2010 my kitchen was torn out ready for a new one....the landlord also paid for a new combi boiler. After the boiler was fitted the fitter asked me if i had smelt gas....i told him that i hadnt but there was a silly odor i couldnt identify. He then went on to tell me that he had to replace a section of pipe as it had a pin hole leak in it. I have pictures of the old pipe...before it was replaced and the " section " that was replaced due to the leak. The pipe was located behind a kitchen cabinet....none of the cabinets had backs. I have secured a lot of information regarding natural gas poisoning....i have contacted the manufacturer of the odour as well as NGRID. I have print outs from the Hazardous Substances Database which i am going to show to my doctor tomorrow. There is clearly a link between the time i moved to the property...the gas leak found and my 5 years of untreatable nausea. Natural gas poisoning causes a lot of the symptoms i have. I have called an ambulance on several occasions due to what felt like heart attacks...im 30 btw. This is every documented. As are every the medications i have been prescribed and the tests carried out. At the beginning of my sickness i had an Endoscopy....they thought it was bacteria to start with but then slowly drew to the conclusion it was infact anxiety. This seemed like a plausible answer to my nausea, shaking, chest cramps, insomnia, and agoraphobia. I had split up from my girlfriend due to my sickness....i was always so nauseas i could never go out in the final 2 years of our relationship....i was with her for 7 years! and the final 2 i was so sick she decided she could no longer cope with it. Since 2005 i have been able to work maybe 2 years because i have always felt so sick....mainly in the morning. Everything points to the gas being the root of the problem.....please read up on natural gas poisoning before claiming its not toxic....or talking about CO2 poisoning....ITS NOT THE SAME. I have spent the last week reading up on each chemical in the gas before it is burnt....as it is in the pipes before combustion. The gas BEFORE combustion contains a whole bunch of nastyness......the gas in the pipes are made up of : 90% Methane 5% Ethane 3% Propane 2% Other components ( radon, benzene, and odourants ) Like i say i have studied difficult on this subject, i do not expect my doctor to accept that they were wrong so i have printed off a lot of data to show them. I have also requested my medical history from 2005 - 2009. This shows a clear correlation. My landlord is responsible....they send in a contractor to maintain the boiler but they are useless....and have clearly failed to spot the leak. I have made numerous complaints about this company over the past 5 years. The windows are always on vent in my place due to the " horrid " odor i reported back in 2005. I also smoke. What should i do now....???? the evidence is clearly piling up against my landlord. I have taken fabric samples of furniture and sealed them in air tight jars. Blood tests can reveal the poisoning....its shown in the blood count....i have had maybe 40 blood tests in the past 5 years. I was earning £35k a year prior to my illness. I intend on suing my landlord....you may say that its for the money and yea it is!! My life has been misery for 5 years....i want to live it to the max now im free of my nausea!!! I might also point out that natural gas also has a more sinister side in that it can cause infertility and cancer in the bones ( leukaemia ) so i will be requesting tests for these also. I dont want to use a no win no fee lawyer....but have no idea what do do from here really? I want to sue for loss of earnings, pain and suffering and damages. I would imagine if successful this could be potentially worth £200k +, so i do not want to use a crappy lawyer with no knowledge or an ambulance chaser. Any advice would be greatly appreciated as im g For twats like BruceWayne..... Dont blame me dick head, blame my landlord :p...blame my doctor but you cant blame me PRICK! So what hes basically saying is that even though i was being poisoned this is not a good enough reason to clam benefit??? How about fuck off twat...i pay my taxes...probably more than you ever have :p

8 Mar 2010, 5:21 pm | click here for answers

Open Question: please help me with this basic physical science?

1. What nice of friction occurs as a fish swims through water? (1 point) fluid rolling sliding static 2. As you push a cereal box across a tabletop, the sliding friction acting on the cereal box _____. (1 point) acts in the direction of motion equals the weight of the box is usually greater than static friction acts in the direction opposite of motion 3. The forces acting on a falling leaf are _____. (1 point) air resistance and fluid friction gravity and air resistance gravity and static friction weight and rolling friction 4. An orange might roll off your cafeteria tray when you cease suddenly because of _____. (1 point) the balanced forces acting on the orange the centripetal force acting on the orange the friction forces acting on the orange the orange’s inertia 5. In which of the following are action and reaction forces involved? (1 point) when a tennis racket strikes a tennis ball when stepping from a curb when rowing a boat every of the over 6. The product of an object’s mass and velocity is its _____. (1 point) centripetal force momentum net force weight 7. What is conserved when two objects collide in a closed system? (1 point) acceleration momentum speed velocity 8. When opposite poles of two magnets are brought together, the poles _____. (1 point) attract each other repel each other cancel each other cause a net force of zero 9. Which of the following universal forces is the weakest? (1 point) electric gravitational magnetic strong nuclear 10. The force that keeps an object moving in a circle is called _____. (1 point) centripetal force fluid friction inertia momentum 11. A brick weighs 26 N. Measured underwater, it weighs 11 N. What is the size of the buoyant force exerted by the water on the brick? (1 point) 37 N 26 N 11 N 15 N 12. A ball is floating partially submerged in a liquid. The buoyant force acting on the ball equals the _____. (1 point) volume of the ball below the surface volume of the ball over the surface mass of the ball weight of the ball 13. Which of the following substances will sink in glycerin? (The density of glycerin is 1.26 g/cm3.) (1 point) water (1.00 g/cm3) ethyl alcohol (0.81 g/cm3) benzene (0.90 g/cm3) aluminum (2.70 g/cm3) 14. A cork is floating in salty water. As more salt is added to the water to increase its density, the cork will _____. (1 point) float at a higher level in the water float at a lower level in the water sink float at the same level in the water

8 Mar 2010, 3:47 pm | click here for answers

Open Question: i have no idea what this chemistry question means?!?

The vapor pressures of pure benzene and toluene at 25°C are 95.1 and 28.4 mm Hg, respectively. A solution is prepared in which the mole fractions of benzene and toluene are both 0.500. What are the partial pressures of the benzene and toluene over this solution? What is the total vapor pressure?

8 Mar 2010, 2:13 pm | click here for answers

Open Question: Reactivity of Aliphatic and Aromatic? Help?

Put the following in order from most reactive to least reactive... Alkanes, Alkenes, Alkynes, Benzene Explain? Thanks

8 Mar 2010, 12:41 pm | click here for answers

Open Question: hey friends i badly need your help for my chemistry exams please help me out!?

reaction covered in lectures: withig reaction, ozonolysis, oxo process,friedel craft acylation, clemenson reduction, wolff kishner reaction, cannizzaro & cross cannizzaro reaction and other simpler reactions. consider the following reactions: 1) <=> = = <=>-o-<=> (<=> consider that as a benzene ring. the =in between shows that 2 steps are involved) (7marks) 2) CH4 = = C2H4 ( no marks were allowed for free radical substitution) (9marks) 3) CH3CH2CH2OH = = CH3COOH + HCOOH (9marks) outline fully the synthetic pathways, giving reagents, of the 3 schemes over. provide the mechanisms as well.

8 Mar 2010, 10:45 am | click here for answers

Resolved Question: Why is propane more soluble in benzene and propanol?

7 Mar 2010, 9:55 am | click here for answers

Open Question: Three Chemistry Questions?

Please give me an explanation to how these should be worked out. Thanks in advance! 1. Water is added to 1.1 L of an 18 M H2SO4 solution to make a new volume of 5.6L. What's the molarity of the new solution? 2. The volume of alcohol gift in 620 mL of a 40% (v/v) solution of alcohol is. . . ? 3. If 39 grams of benzene are dissolved in 100.0 grams of water, what is its boiling point?

7 Mar 2010, 9:26 pm | click here for answers

Open Question: how could you separate acetone and benzene?

7 Mar 2010, 8:03 pm | click here for answers

Open Question: In free radical bromination, which reacts faster theoretically, cyclohexane or tert-butylbenzene?

Cyclohexane has 12 secondary aliphatic hydrogens, and tert-butylbenzene has 9 primary aliphatic hydrogens. (in addition to its 5 aromatic) So why does tert-butyl benzene react faster? Is it because cyclohexane is so stable due to the seat conformation?

7 Mar 2010, 7:15 pm | click here for answers

Open Question: PLEASE EXPLAIN THIS TO ME! 10 POINTS BEST ANSWER?

When benzene (C6H6) reacts with bromine (Br2), bromobenzene (C6H5Br) is obtained : C6H6 + Br2 -----> C6H6Br + HBr What is the theoretical yield of bromobenzene in the reaction when 30.0 g of benzene reacts with 65.0 g of bromine? The answer is 60.3g C6H5Br I just need someone to explain WHY..and HOW to receive the answer.

7 Mar 2010, 6:41 pm | click here for answers

Open Question: Help with a chemistry question?

Lauryl alcohol's empirical formula is C12H26O. A solution of 5g of lauryl alcohol in 100g of benzene (Tb=80.10, kb=2.53 c/m) boils at 80.78c. Find the molecular formula of lauryl alcohol.

7 Mar 2010, 4:54 pm | click here for answers

Open Question: Physical Chemistry Problem please help?

The normal boiling point of benzene is 353.3 K and its enthalpy of vaporization is 30.8 kJ/mol a) at what temperature will benzene boil if the pressure is reduced by a factor of 2? b) at what pressure will it boil ar room temperature (298K) I know how to do part a), the answer is 331.4 K, the only part I'm having problems with is part b), i have no idea where to even start... so please any help will be greatly appreciated thank you

7 Mar 2010, 3:17 pm | click here for answers

Open Question: HELP ASAP!!! Camphron is a low volatility solid?

The vapor pressure of benzene is 100.0mmHg at 26.0*C. Calculate the vapor pressure of a solution containing 24.6g of camphor (C10H16O) dissolved in 98.5g of benzene.

7 Mar 2010, 2:18 pm | click here for answers

Open Question: chemistry question help...?

7 Mar 2010, 2:05 pm | click here for answers

Resolved Question: General Pump design guidelines?

I have a design project for school that I have a few questions on. First off I have receive benzene from the tank farm to reaction conditions. I am assuming I need to pump benzene from 101 kPa to 3000 kPa. What is the maximum pressure increase a pump can handle? I know for compressors a general guideline is compression ratio of about 1.8. Is there a similar guideline for pumps? On a side note, while I was out in the industry I heard some of the engineers were referring to the number of stages in a pump in the same houseing. What stages are they referring to? Also, at one point in the plant I might have to drop pressure in a liquid line. Is there something similar to a gas turbine for liquids so I might be able to extract some energy from the pressure drop? Thanks for any help.

7 Mar 2010, 1:59 am | click here for answers

Open Question: Why is methylbenzene more susceptible to electrophilic attack than benzene?

7 Mar 2010, 12:46 pm | click here for answers

Open Question: How can you synthesize n-Propyl cyanide from Benzene and ethyl alcohol as the only starting materials?

Any additional materials used to carry out special reactions must be 4-carbon molecules or smaller.

7 Mar 2010, 11:26 pm | click here for answers

Open Question: Harrrddd molar mass question, please help!? Desperate.?

If 4.18 g of a nonionic solute is dissolved in 36.30 g of C6H6, the freezing point is 2.70 C. Find the molar mass of this solute. The freezing point of benzene(C6H6) if 5.53 C and the Kf is 5.12 C/m. HELP PLEASEE

7 Mar 2010, 10:49 am | click here for answers

Open Question: Hydrogen chloride in methyl benzene?

Describe the properties of solutions of hydrogen chloride in water and in methyl benzene

6 Mar 2010, 6:57 am | click here for answers

Open Question: HELP!!,Give the product of the reaction of excess benzene with:?

CH3-CH2-CH2-CH2-CH2-CH3 + (2AlCl3 and heat as catalyst) - Cl Cl ok, the compound is wrong written! is a 2,5 di chloro hexane thank youuu

6 Mar 2010, 5:03 pm | click here for answers

Resolved Question: What is the equation for the heat of formation of ethanol?

And the equation for the heat of formation of benzene? Thanks.

6 Mar 2010, 3:32 am | click here for answers

Resolved Question: [ORGANIC CHEM T.T] Benzene to 4-chlorobenzoyl chloride ?

Hey guys, i have to carry out the synthesis of 4-chlorobenzoyl chloride from benzene but im confused with what should arrive up first. 1. How would you carry out the synthesis of 4-chlorobenzoyl chloride from BENZENE ? --> Does chlorination occur at the very end or at the beginning ? (Cl is para directing) Little help, big Thanks ^^

6 Mar 2010, 1:25 pm | click here for answers

Open Question: Nitration reaction of 2-benzylpyridine?

In the nitration of 2-benzylpyridine, why does the nitration occur selectively at the benzene ring? The reaction is run below acidic conditions. I know this will affect the pyridine in some way as that the nitration of benzene will occur faster but I don't know how. Any help would be really appreciated, thanks.

5 Mar 2010, 6:30 pm | click here for answers

Open Question: Calculate the number of molecules present in each of the following samples.?

(a) 6.21 mol of carbon monoxide (b) 6.25 g of carbon monoxide (c) 2.99 multiplied by 10-6 g of water (d) 2.61 multiplied by 10-6 mol of water (e) 5.97 g of benzene, C6H6

5 Mar 2010, 4:33 pm | click here for answers

Resolved Question: naming substituted benzene? URGENT?

what is the name for a benzene that is substituted on one end (4-) with CH3 and on the other with (1-) MgBr (magnesium bromide)?

5 Mar 2010, 1:35 pm | click here for answers

Voting Question: Engineering Sorption question?

Groundwater surrounding a leaking underground storage tank has benzene concentration of 0.65 mg/L. The soil below the water table has an organic carbon fraction of 5%. What is the concentration of the benzene on the soil (units of mg/kg) for a linear isotherm relationship?

4 Mar 2010, 7:21 pm | click here for answers

Resolved Question: What is the charge of an -NH2?

I know Nitrogen has a lone pair of electrons gift even with the 2 hydrogens attached. But is the Nitrogen negatively or positively charged as it is over. If it helps the -NH2 is attached to a benzene containing an OH group in position 4. (para to NH2) Any help is much appreciated But if its neutral how does it undergo acetylation with acetic anhydride?

4 Mar 2010, 1:39 pm | click here for answers

Resolved Question: Please resolve my Freezing Point problem?

I need to correct my process. My answer is wrong. What is wrong with my process? How many grams of naphthalene, C10H8, would you add to 51.0 g of benzene, C6H6(l), to produce a solution that has the same freezing point as pure water? The benzene freezing point is 5.53 and K freezing is 5.12. My answer was 604. DeltaT=Km 5.53-0.00=5.12(m) solve for m, which is 1.08mol/kg. multiply 51g benzene into molar mass and multiply it by m to find kg naphthalene. Convert kg to g. Why is my answer incorrect at 604? (please excuse my lack of units) This is my process, what is wrong with my process? Please correct it.

3 Mar 2010, 9:26 pm | click here for answers

Voting Question: what is the bp of benzene/?

3 Mar 2010, 8:17 am | click here for answers

Voting Question: Chemical equation grade 11 chemistry Questionn?

What is the formation of benzene (C6H6) from its elements? -----> C6H6 I can do every the balancing i just need to check my answerr Synthesis of ammonia from its elements (NH3) Thankss :)

3 Mar 2010, 8:09 pm | click here for answers

Voting Question: need helping naming the benzene ring quick please thanks!?

it's a benzene ring with 6 sides, it's disubsituted a group at the top and one at the bottom , the one at the top is CHO and the one at the bottom is OCH3 IUPAC name please, thanks!

3 Mar 2010, 2:38 pm | click here for answers

Resolved Question: help with science plz?

1. What nice of friction occurs as a fish swims through water? fluid rolling sliding static 2. As you push a cereal box across a tabletop, the sliding friction acting on the cereal box _____. acts in the direction of motion equals the weight of the box is usually greater than static friction acts in the direction opposite of motion 3. The forces acting on a falling leaf are _____. air resistance and fluid friction gravity and air resistance gravity and static friction weight and rolling friction 4. An orange might roll off your cafeteria tray when you cease suddenly because of _____. the balanced forces acting on the orange the centripetal force acting on the orange the friction forces acting on the orange the orange’s inertia 5. In which of the following are action and reaction forces involved? when a tennis racket strikes a tennis ball when stepping from a curb when rowing a boat every of the over 6. The product of an object’s mass and velocity is its _____. centripetal force momentum net force weight 7. What is conserved when two objects collide in a closed system? acceleration momentum speed velocity 8. When opposite poles of two magnets are brought together, the poles _____. attract each other repel each other cancel each other cause a net force of zero 9. Which of the following universal forces is the weakest? electric gravitational magnetic strong nuclear 10. The force that keeps an object moving in a circle is called _____. centripetal force fluid friction inertia momentum 11. A brick weighs 26 N. Measured underwater, it weighs 11 N. What is the size of the buoyant force exerted by the water on the brick? 37 N 26 N 11 N 15 N 12. A ball is floating partially submerged in a liquid. The buoyant force acting on the ball equals the _____. volume of the ball below the surface volume of the ball over the surface mass of the ball weight of the ball 13. Which of the following substances will sink in glycerin? (The density of glycerin is 1.26 g/cm3.) water (1.00 g/cm3) ethyl alcohol (0.81 g/cm3) benzene (0.90 g/cm3) aluminum (2.70 g/cm3) 14. A cork is floating in salty water. As more salt is added to the water to increase its density, the cork will _____. float at a higher level in the water float at a lower level in the water sink float at the same level in the water

3 Mar 2010, 1:40 am | click here for answers

Resolved Question: Chemistry 2 question?

14-93. A solution of 12.00 g of an unknown nondissociating compound dissolved in 200.0 g of benzene freezes at 3.45 C. Calculate the molecular mass of the unknown.

3 Mar 2010, 1:11 am | click here for answers

Voting Question: Which is a stonger electron withdrawing group for EAS reactions? F, Cl, Br, I?

I know that Flourine is more electronegative, but also it can donate better to the benzene ring in EAS reactions than can Cl. I thought the electronegativity overides this latter fact, but my problem says that para-chlorobenzoic acid is more acidic than para-flourobenzoic acid. thanks a ton....

3 Mar 2010, 12:15 am | click here for answers

Voting Question: The freezing point of a solution of 6.81 g of an unknown compound dissolved in 76.01 g of C6H6, benzene, is?

-1.53°C. Calculate the molar mass of the compound. ( The normal freezing point for C6H6 is 5.5°C and the Kf = 5.1 °C · kg solvent/mol solute )

3 Mar 2010, 11:13 am | click here for answers

Voting Question: The boiling point of a solution of 9.07 g of an unknown compound dissolved in 60.02 g of C6H6, benzene, is?

84.45°C. Calculate the molar mass of the compound. ( The normal boiling point for C6H6 is 80.1°C and the Kb = 2.53 °C · kg solvent/mol solute )

3 Mar 2010, 11:12 am | click here for answers

Voting Question: Chemistry: Chlorobenzene?

Hi, I'm just reading through my A Level text book and I'm a little confused in the statement its made: It is talking about the increased electron density between chlorine and the ring of delocalised electrons due to the lone pairs. That is every straight forward: However: "The increased electron density of the bond also makes it shorter and stronger than the corresponding bond in a haloalkane. This means that the bond is more reluctant to break and consequently the substitution of the halogen by ammonia is much less likely. " I can make sense of every of this, except "This means that the bond is more reluctant to break" If its a smaller bond and a stronger bond, how is it more reluctant to break? Obviously if it does break it makes the benzene ring a negative charge, making nucleophilic substitution highly unlikely. But how is chlorine more reluctant to break below these conditions? Thanks :)

3 Mar 2010, 10:57 am | click here for answers

Resolved Question: Science Help Please!!!?

8. When opposite poles of two magnets are brought together, the poles _____. * attract each other * repel each other * cancel each other * cause a net force of zero 9. Which of the following universal forces is the weakest? * electric * gravitational * magnetic * strong nuclear 10. The force that keeps an object moving in a circle is called _____. * centripetal force * fluid friction * inertia * momentum 11. A brick weighs 26 N. Measured underwater, it weighs 11 N. What is the size of the buoyant force exerted by the water on the brick? * 37 N * 26 N * 11 N * 15 N 12. A ball is floating partially submerged in a liquid. The buoyant force acting on the ball equals the _____. * volume of the ball below the surface * volume of the ball over the surface * mass of the ball * weight of the ball 13. Which of the following substances will sink in glycerin? (The density of glycerin is 1.26 g/cm3.) * water (1.00 g/cm3) * ethyl alcohol (0.81 g/cm3) * benzene (0.90 g/cm3) * aluminum (2.70 g/cm3) 14. A cork is floating in salty water. As more salt is added to the water to increase its density, the cork will _____. * float at a higher level in the water * float at a lower level in the water * sink * float at the same level in the water

2 Mar 2010, 7:15 pm | click here for answers

Voting Question: An ideal solution is made of 13.2% methane and..?

An ideal solution is made of 13.2% methane and either chloroform (CHCl3) or benzene. Assume that the methane does not add to the solution's volume... What is the most likely solvent and justify. Chart given: Chloroform's density: 1.48 Benzene density: .0786 Normal Boiling pt Chloroform: 61.70 celsius Normal BP of Benzene: 80.10 Vapor Pressue @ 20 C (Chloroform): 159 For benzene: 56.5

2 Mar 2010, 6:17 pm | click here for answers

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Check frequently asked questions about Benzene