Homework Help

Hi, I'm new here, but I really needed an answer to my question. I wasn't exactly sure where to put this, but since it's homework I decided to put it here. On the 10th, I started growing a Bread Mold Colony. I took four samples of bread, poured a small amount of water over each, placed them in separate plastic bags, then placed one on my counter in the kitchen where I usually keep bread, another in a window, one in the freezer, and one in the fridge. For reference this is Whole Wheat bread. My dilemma is that an unidentifiable substance has grown on the bread I placed in the window. None of my other bread had this problem. It is growing out of the top and over th…

Ok I'm not sure if this is alright, but I was hoping I might be able to have a little bit of help finding some items for a chemistry class. The only one I need help with right now is: 1) A ternary compound that contains a halogen

Let me begin by introducing myself, Well, I will refer to myself as Burbuat. I have, for the past 4 days, tried to identify an unknown substance provided for me by my teacher. We have 8 days to identify this unknown substance, but I am afraid I will not be able to correctly identify this unknown substance without proper assistance. We have run some basic tests to try to hint at what the substance may be, but I will need your help in narrowing it down. We have done a flame test, and the flame burned at an orange/yellow flame, although my group swears they see a tiny hint of purple now and then, but I believe that is just paranoia sinking in form our approaching de…

I need to learn how to classify an animal on sight for my biology class, and am goin to start learning all the phylum, any good ideas on how to memeoroze them all?

Final is coming up, and I'm going over all my homework. I'm trying to understand this part, though, and i'm not sure I get it. Question: Two non interacting particles of mass m each are inside a cubical box of side a and rigid walls (potential 0 inside and infinity outside). a) Write the states for the lowest 3 values of the energy if the particles are distinguishable. What is the degeneracy of each level? So, this is an infinite square well in three dimentions, with two particles: Energy eigenstates are represented with: [math]E_n=\frac{\hbar^2 \pi^2}{2ma^2}(n_{x_1}^2+n_{y_1}^2+n_{z_1}^2 + n_{x_2}^2+n_{y_2}^2+n_{z_2}^2 )[/math] In an infinite square we…

Hey everyone, OK i am a bit stuck. I am doing some excercises on graphs and here is this table that contains data to plot a graph to determine the activation energy T/K---------------------------- [math] 10^{13} k / cm^3 molecule^{-1} s^{-1} [/math] 300----------------------------1.04 350----------------------------1.87 400----------------------------3.04 450----------------------------4.60 500----------------------------6.58 I have constructed an arrhenius plot( ln(k) vs 1/T) from this data using excel. I am getting a slope of -1379. using ln(k) =ln(A)-Ea/R *(1/T) so slope = -Ea/R and Ea = -slope*R this means that Ea is [math] (1…

hi guys, sorry to hastle everyone. I have a big assignment due tomorrow, and have had no luck at all with 2 of the questions. I really need solutions ASAP, and hate to ask, but im stuck and i am desperate for the solutions in order to pass the subject. If anybody can help me out, I will happily donate to this site quite generously!! (i must apologise if i am breaking any rules) here they are: 1. Verify the Gauss Divergence Theorem: ∫∫∫∇ ⋅F dxdydz= ∫∫ F .nˆ dA , where the closed surface S is the sphere x^2 + y^2 + z^2 = 9 and the vector field F = xz^2i + x^2 y j + y^2 z k . 2. Consider a surface S which is that portion of the plane 2x + 2y + z = …

Hi can someone help me on answering the past exam question that i have attached Thanks

The VP of Hg is given by the expression: ln(P/torr)= 7060.7 K/T + 17.85 -At normal BP of Mercury, 629.88 K, the density of the liquid is 12.7 g/mL and the density of the vapor is 3.82 g/L. Find the molar enthalpy (kJ/mol) for vaporization at this temperature. State any "assumptions" made. ---- I tried using Clausius-Clapeyron relation but I dont know what to do with the given relation. I also do not know what to do with the densities. I have been stuck on this problems for hours. Any pointers will be greatly appreciated. Thank you

hi everybody, actually I need your help because I have an examination in writing description coposition in english , and what I want of you is to correct me because it's your mother language here is the composition As long as I live , I will never forget the high-school experience , because I had suffered a lot of its pressure. It is unbelieveable how this experience had affected my life , I had to wake up very early in the morning to revise any thing before going to school and when I return I had to study very hard in order to achieve my abition. Now , after graduating from the high-school I had reaped the benefits of my hard work and I got great marks i…

The geometric sum to infinity of a series with a ratio of r, and started with a, is calculated to be: G(infinity) = a/(1-r) But I am thinking of: Each term in a series could be represented by: a(0) = a; a(n) = ar^n, so why can't we integrate a(n) with respective to dn, giving us (ar^n)/(ln®), but obviously this is the the expected answer. I'm interested in what makes such a difference. Thanks.

So, I was given an unknown chemical that I was to identify. Along with that chemical, I was given an NMR and a series of 7 tests to complete to identify this unknown chemical. I have all the results now, but I have been trying to figure out what this chemical is, but I can't. I know that it is either a ketone, aldehyde, alkene, or an alcohol due to a series of solubility tests. 1) My IR that I took showed a strong O-H and a strong C=O stretch. 2) The 2,4-DNP test produced a yellow precipitate (no conjugation 3) It reacted with CrO3 to produce a brown product (either a primary or secondary alcohol) 4) When mixed with Bromine, there was a color change to orange (doub…

Hi So, I have a project for school and I'd appreciate some help? thanks. When will iron nails rust more rapidly? Four options are: 1. Distilled water 2. adhydrous calcium chloride 3. Boilled distilled water and olive oil 4. distilled water and oxygen Please help with this it's for a school project! THANKS.

"Draw an example of a functional group found in an enzyme that would act as a base. What part of the enzyme contains that functional group? Explain how/why it acts as a base?"-----Any help on this topic would be greatly appreciated!!!

The question is to find to integral of 1/(x(sqrt(x+4))) I tried substitution with x equals 4(tan(x))^2 but not succeed, could anyone help?

"A 100mL solution containing 1M sodium acetate was made. The pH was than adjusted to 5.5. A similar solution containing NaCl was also made and treated similarly. Then 1mL of 1M NaOH was added to both solutions. Qualitatively (no numbers/calculations are necessary) explain what if any difference in the change in pH occurs between the two solutions. If the pH changes in the two solutions are different, explain why. For both solutions, explain (draw) what is happening to all of the chemical entities (e.g molecules) in the solution with the NaOH?"----Any help would be great!!

"The major non-covalent forces related to the formation of protein structures are H-Bonds, ionic interactions(electrostatic interactions), and hydrophobic interactions(which are caused by things like Van der waals forces). Give (draw) examples of how the dipeptide (L-Asn-L-Leu) could participate in each one of those types of interactions with functional groups frequently found in proteins? Make it clear exactly what atom/group is interacting with what other atom/groups. Explain the interaction you have drawn and why they fit one of the three categories given? " --I know this is a mouthful but any help would be greatly appreciated!!

Hello all, I'm in organometallic chem right now, and this question is on our new problem set: The rxn of IrCl3 with EtOH produces trans-Ir(PPh3)2(CO)Cl aka Vaska's copmlex along with 2HCL and CH4. When isotopically labeled ethanol is used (CH3CH2OH), the carbonyl ligand is fully enriched in 13-C. Provide a mechanism. Do not worry about the degree of solvation or PPh3 coordination at each step. IrCl3 + 2 PPh3 ---Ethanol---> Vaska's Complex I talked to my professor this afternoon, and he was somewhat helpful, but I'm still having problems. He said to remember that the starting Ir complex dissociates in polar solvent, so there would be constant lig…

Hey guys, Homework question: Two exotic particles of spins 1 and 3/2 form a bound state. a) What are the possible values of the total spin of the bound state? -- So, I know that: [math]s_{1}=3/2[/math] [math]s_{2}=1[/math] [math]S = (s_{1}+s_{2}) , (s_{1}+s_{2}-1) ... |s_{1}-s_{2}| = 5/2, 3/2, 1/2 [/math] Also, 'm', is defined according to what I've read as: m=-s, -s+1,... +s So in this case, m would be: [math]m_{1} = -3/2, -1/2, 1/2, 3/2[/math] [math]m_{2} = -1, 0, 1[/math] Which is where I am getting stuck. My m1 and m2 have different number of components. When I compose the possible states, how does this work out?? [mat…

Okay, so...this is the third time I have seen a question of this exact form, and have gotten it right both times. This time, I got it wrong, and am completely stumped as to why! Any help is greatly appreciated. A voltaic cell consists of an Au/Au3+ electrode (E° = 1.50 V) and a Cu/Cu2+ electrode (E° = 0.34 V). Calculate [Au3+] if [Cu2+] = 1.20 M and Ecell = 1.13 V at 25°C What is the correct answer? Less negative is 1.50, reduced, .34 flipped to -.34. Overall E^o is 1.16 1.13=1.16-(.05916/6)log(1.20/x) -.03=-.00986log(1.2/x) 3.042=log(1.2/x) -2.963=logx 10^-2.963=.001

Hey. I am doing my School Research Project on 'How does temperature alter the rate at which bananas rot. I have the hypothesis that the more hot the temperature, the quicker it will rot, but i need to show research and why this happens etc but i cant find anything. Will someone please help me. Thankyou!

Sorry for my bad English, I'm Romanian... So, I've got a homework where im supposed to define a moment along the inner contour of a ring like plate. -see 1st picture- The problem is that I could find a program that allows me to do that... Ansys only lets me define the moment in the Cartesian Coordinate System, not the Cylindrical one, and thus the moment doesn't deform the plate like in the picture, but in a different way -see picture 3-. I had to build the 2nd ring in order to define the moment vector direction along Z, because originally the program would only accept a direction that is the same with the axis of the hole and made the moment act like it were sp…

I am trying to understand what the effects of a voltage difference would have in the method of electrostatic charge spray painting..

For my lab, I have to figure out the number of water molecules that are present in K3Fe(C2O4)3 nH20 for every iron atom with the percentage of oxalate. I found my percentage which is 43.36%. I'm having trouble of where to start. Please Help PS- Let me know if you need any extra information

Hi there, would someone be able to tell me if this is right or almost right or really not right?! The scenario being explaining the transfers and conversions of energy of a diver. from walking up the steps to standing at the top of platform to jumping into pool and to start swimming. So i have - CHEMICAL -INTERNAL & KINETIC - POTENTIAL & GRAVITATIONAL (transfered from body to steps then once reached the top of steps) POTENTIAL & GRAVITATIONAL - CHEMICAL - KINETIC & GRAVITATIONAL - SOUND&HEAT ( From board to a dive into the pool and on entrance to the pool) CHEMICAL - KINETIC& HEAT & SOUND (whilst swimming) Than…