chemstudent

Write balanced equations showing how HBr and SO2 are consumed in a gas trap containing NaOH.

17 years ago

The question asks to determine the IUPAC name of a compound based on a diagram. I would choose the name: (Z)-5-ethyl-2,4,6-trimethyl-2,4-octadiene However, this doesn't match any of the given choices. They are: a. (Z,Z)-5-Ethyl-2,4,6-trimethyloctadiene b....

17 years ago

Which mechanism can better account for the product mixture obtained from the dehydration of cis and trans 4-methyl-cyclohexanol: E1, E2, or a combination of the two?

17 years ago

Show the mechanism that illustrates the following reaction. 1-methyl-1-methanol-cyclopentane + acid -> 1-methyl-cyclohexene So, there is an elimination reaction, *AND* the carbon ring grows from a five carbon ring to a six carbon ring. (I hope my IUPAC na...

17 years ago

isopentyl alcohol is reacted with acetic acid to make isopentyl acetate through Fischer esterification. Sulfuric acid is used to assist the reaction. After the reaction, the solution is washed with sodium bicarbonate. What reactions take place during this...

17 years ago

I'm working with a reaction of the form: A + B -> C Problem: IF the equilibrium constant is 4.2 and an equimolar mixture of A + B are reacted, verify that there will be an equilibrium yield of 67%. Here is my attempt thus far. 4.2 = [C] / ([A]*[B]) x = st...

17 years ago

Why is rubbing alcohol poisonous? Some rubbing alcohols are made from isopropyl alcohol which you clearly can't drink, but most rubbing alcohol is made from ethanol and water which are the same ingredients in alcoholic beverages. I hear that rubbing alcoh...

17 years ago

Solid NaI is slowly added to a solution that is .010M in Cu+ and .010M in Ag+... a.) which compound will precipitate first b.) calculate [Ag+] when CuI just begins to precipitate c.)what % of Ag+ remains in solution.

17 years ago

A quantitative amino acid analysis reveals that bovine serum albumin (BSA) contains 0.58% tryptophan (Mr 204) by weight. A) Calculate the minimum molecular weight of BSA (i.e. assume there is only one Trp residue per protein molecule) B) Gel filtration of...

17 years ago

What is the difference between acyl, acetyl, and enoyl?

16 years ago

A sample of 1.00 mol H2O(g) is condensed isothermally and reversibly to liquid water at 100°C. The standard enthalpy of vaporization of water at 100°C is 40.656 kJ mol−1. Find w, q, ∆U, and ∆H for this process. ------------- I can solve for ∆H: n * standa...

16 years ago

A sample of an ideal gas consists of 2 moles, pressure = 1 atm, volume = 0.5 liters Find the temperature pV=nRT T = p*V/(n*R) T = 1 atm * 0.5 liters / (2 moles * .08206 L atm K^-1 * mol^-1) T = 3.04 K Did I do that problem correctly? That temperature seem...

16 years ago

The general formula for moment of inertia is: I = Sigma mi * ri^2 (mi is mass of atom, ri is distance to axis of rotation) In a diatomic molecule, the moment of inertia is I = ma*mb(ma+mb) * R^2 (R is distance between atoms, ma and mb are masses of two at...

16 years ago

Calculate the entropy change in the surroundings when 1.00 mol N2O4(g) is formed from 2.00 mol NO2(g) under standard conditions at 298 K. I get +192 J/K. The book says -192 J/K. Here is my work, where am I going wrong? Standard Enthalpy of NO2(g) = 33.18...

16 years ago

I love this jiskha service so far. It's been extremely helpful, however I was wondering if there were pay services that offered a little more. Sometimes I don't get answers to homework problems I'm stuck on. I think it's harder to get help on some college...

16 years ago

What is the temperature of a two-level system of energy separation equivalent to 300 cm^−1 when the population of the upper state is one-half that of the lower state? What does this "energy separation equivalent to 300 cm^−1" mean? I can get this far: n1...

16 years ago

why is fe 2+ a better reducing agent then mn2+. ( I thought since mn2+ had a higher Eox it would be better)

15 years ago

Create a visual representation of ionic substances to connect the microscopic structure of ionic substances to each of the following macroscopic properties. a. solubility in polar compounds. b. Brittleness. Can I please get help, I am so confused! Thanks

4 years ago

Redox Titrations: a. write 2-3 sentences describing and identifying the type of chemical reaction that occurs when Fe2+ reacts with potassium permanganate (KMnO4) and specifying the type of solution for the reaction to occur. b. using a standard reduction...

4 years ago

If a solid is soft and white and melts at 75 celsius but does not conduct electricity in solution, which type of solid would it be classified as?

4 years ago

Write 2-3 sentences describing and identifying the type of chemical reaction that occurs when Fe2+ reacts with potassium permanganate (KMnO4) and specifying the type of solution required for the reaction to occur. b. using standard reduction potential tab...

4 years ago

thanks!

17 years ago

(I think my tabs broke that post. retrying...) The question asks to determine the IUPAC name of a compound based on a diagram. I would choose the name: (Z)-5-ethyl-2,4,6-trimethyl-2,4-octadiene However, this doesn't match any of the given choices. They ar...

17 years ago

I was hoping you could envision the molecule given my estimated IUPAC name of: (Z)-5-ethyl-2,4,6-trimethyl-2,4-octadiene

17 years ago

help? is this question poorly worded? Is there no clear answer? I transcribed from my assignment directly.

17 years ago

nevermind. figured it out.

17 years ago

If primary alcohol is oxidized once, you get an aldehyde group (if oxidized twice you would get a carboxylic acid) 2-ethyl-3-hydroxyhexanal If secondary alcohol is oxidized, you get a ketone: 1-hydroxy-2-ethylhexan-3-one If both oxidize, you have a ketone...

17 years ago

1-hexanal is redundant. In an aldehyde, the aldehyde carbon is always #1. After seeing DrBob's answer, I'd change the substituent orders in my answer to be alphabetic: 2-ethyl-3-hydroxyhexanal 2-ethyl-1-hydroxyhexan-3-one 2-ethyl-1-formylhexan-3-one

17 years ago

Perfect. Thanks!

17 years ago

Thanks so much. I thought I was missing something, but you are right. Either I'm misreading the problem or it can't be solved from the information provided. I'll turn that in. Thanks!

17 years ago

The problem I have with this is, that if I change the initial 1 concentration to something else, like 2 for example, then x/2 solves to a different yield % (71%). This leads me to believe that there is no constant yield percent for the given problem.

17 years ago

Each choice properly multiplies up to 1386, but D is the only choice that has all prime factors. 693, 231, and 33 aren't prime numbers since they can be factored further.

17 years ago

I'd say, the answer is the product of the first three prime numbers. 2*3*5=30

16 years ago

I already googled and read those exact pages before posting. Acyl and Acetyl look like the exact same thing yet they have completely different Wikipedia pages. I get the feeling that there is some difference that I am not seeing.

16 years ago

The iron will lose this much energy upon cooling to 100C: .45 J*g^-1*K^-1 * 50g * 52K = 1170 J The water will gain this much energy when heating to 100C 4.21 J*g^-1*K^-1 * 20g * 11K = 926.2 J The difference in those energies will be used to vaporize water...

16 years ago

GK, thank you so much. That was exactly what I was looking for!

16 years ago

Perfect. I do remember reading that before. Thanks so much for the help!

16 years ago

Those of you looking at this in the future don't forget the quadratic equation!!!

12 years ago

I need help, somebody understand this please!!

4 years ago

Yes it was a fill in the blank. That's why I am confused because there are so many ways to go.

4 years ago

I didn't see the answer you gave me yesterday?

4 years ago

Ok so how would I find the reduction potential for KMnO4?

4 years ago

also, for the net ionic equation, you write MnO4 but it should be KMnO4?

4 years ago