Homework Help

Someone had one of these in Science class today. Everyone was interested so the teacher assigned extra credit for anyone who could tell her how it works. Has anyone seen this technology before? The only link I could find is below. Thanks! http://www.youtube.com/watch?v=5hamvMFwKgo

How do the conditions for nitration of methyl benzoate differ from those for the nitration of benzene? what is the mechanism nitration of methyl benzoate to form methyl 3-nitrobenzoate? Thanks.

Hi all, I have a question on an assignment that requires me to draw a structure for a transition-metal carbonyl complex [Fe2(CO8]2- (I'm new to this forum and cannot see where to apply super/subscript). To work out the structure, I first need to apply the eighteen electron rule. I have worked out that Fe is in the oxidation state +1 and thus each Fe ion contributes 7 electrons. There are 8 carbonyl ligands supplying a total of 16 electrons, that's eight each to each Fe ion - a total of 15 electrons. I know that the metal can be bonded to itself in these complexes but it there is an Fe-Fe bond then that would only supply one additional electron, taking my total to 16…

Ok so I'm trying to understand ACLs (Access Control Lists) and I just somehow can't get it. Especially the part about the wildcards. any help???

Hi, well i have been writing at the chemistry section as well as the experiment sections but i have not recieved a single reply. Now this is really frustrating( i am sorry but i need to express my feeling here, but i have exams in a fortnight and i only sit on the internet just to check whether there are any replies to my problem!). Well, i think its better to digest my anger and try on this section because i was told to get quick replies this is the best place. MY QUESTION: " How do you prepare a solution of any substance if given to prepare X mol dm-3 solution. For example, if we are given hydrogen peroxide, then how will we prepare a 1.00 mol dm-3 solution of i…

Hey i was wondering whether there are mentors on this website? I would like to become one!!! Also who knows easy instructions for making a generator? :confused: :confused: Alo im super cool!!!!!!! :cool: ;) ;) :D :D :D

Dear Readers.......... for the detection of sulfide bearing minerals, which is the best used survey. here is some infomation.......... the dyke of sulfied mineral is tilted about 45 degree and the host rock is granite. there is difference in density is higher in Dyke, susceptibility is 100 times higher in dyke & resistivity is 30 times higher in host rock. Ascol

Is it possible to orient a current carrying loop of wire in a unifrom magnetic field so that the loop will not tend to rotate? I say no because the field of the loop always points in the same direction....but it doesnt sound right?! Give me some feedback please!

I took my final about a week ago, and I was curious about the answer to one of the questions. I haven't been able to ask my professor about it (since I'm no longer in that class), so I figured I'd try here. Consider the following balanced equation. The reaction is endothermic as written. BaSO4(s) + H(+)(aq) in equilibrium with Ba(2+)(aq) + HSO4(-)(aq) (I was going to use the LaTeX, but when I looked at the guide all the appeared were errors, sorry). Which of the following effects will favor a shift to the right side? (A) Decrease temperature (B) Decrease pH © Add a soluble barium salt (D) Increase the pressure in the container (E) Add more BaSO4 (s) …

this is the practice final, and I don't understand all the answers... please help me understand. Thanks Answer choice A. But why does the phenyl group react three times? Does it have anything to do with the aqueous acid attacking the carbonyl oxygen? To me, it looks like they all have aromatic character, except for E, but the answer is given as D. I don't really understand how equilibriums work with amino acids, which have multiple pKas. The answer is given as E. Answer is B. But why wouldn't the acid react with the carbonyl oxygen? I though that would be more reactive than the double bond, and would be protonated over it. …

Hi all, does anybody know if there is a good site on the internet that can provide me with information regarding the analysis of paper chromatograms? I have taken some samples during a lab class and now have to do a small assignment based on them. I'm not really sure on how to analyze them properly. Any help would be greatly appreciated

Hi there, I need to find a positive test for a tertiary alcohol; specifically 2-methylpropan-2-ol. I am aware of oxidising alcohols with an oxidising agent to distinguish between them but this is not a positive test for tertiary alcohols. Any nudge in the right direction would be much appreciated.

Hey all. I was assigned a biology project about a month ago, and I came up with this. I wanted to see how salt would impact the growth of lima bean plants. My independent variable was the salinity, and I used four different salinity levels; fresh water, brackish water, saline water, and brine. The problem is, in the three weeks since I've planted it, nothing has grown. I was very careful with the measurements, and I watered the plants each day and everything. Now I have a project due on Wednesday and I don't know what to do. The question is, can regular terrestrial plants (like the lima beans) grow if watered by brackish, saline water, and brine? I figured they wouldn…

I am having trouble with a probability problem: On average, how many rolls of a pair of dice will it take until the sum of the two dice is four? That is, I roll two dice. If the sum of the dice is not 4, I will roll again until it is 4. How many rolls should it take on average? I know that there are two possible ways to get a sum of four: either one of the dice is a 1 and the other is 3, or both of them are 2. There are 19 combinations of dice that do not results in a sum of 4, so the probability of getting a sum of 4 is 2/19. Now how do I figure out the expected number of rolls it will take to get a sum of 4? This problem is not even for a statistic…

what are the characteristics of enzymes that follow michaelis-menton kinetics?

i wana ask that why cant we drink hard water,though normal water n hard water have same chemical properties??

I need help in design algoritem that check for a given Graph if a minimal spanning tree exist without a specific edge. Mean that for the original graph you find a minimal spannig tree and that spanning tree not include the edge and it is minimal spanning tree of the graph that do include the edge. The algorithm must run in O(|V| + |E|) when V - vertics and E - edge Thank for any help!

Is the HO radical a solid or a gas? In particular when it reacts with NO2 to make acid rain? Thanks )

I am awful at this stuff and i have a few question if anyone can help that would be great 1.A 20.00 g slug of Fe heated to 95.0°C was placed into 100.00g of water at 25°C. The specific heat of the Fe is 0.108cal/g°C. The specific heat of water is 1.00cal/g°C. What is the final temperature of the Fe? 2. A bottle of H2SO4 stock solution is 95% H2SO4 (w/v). Its density is 1.84g/ml. Find its molarity. How many millileters of the stock solution must be diluted to make 2.0L of 0.50-M H2SO4 solution? 3. For the following : H2 (g) ------>. 2H (g) ?H° = +436kj/mol Br2 (g) -------> 2Br (g) ?H° =+ 192.5 kj/mol H2 (g) + Br2 (g) -------> 2HBr (g) ?H° = - 72.4kj/mol Ca…

Hi, I am stuck on this question and would really appreciate some pointers on how to solve it, The specific heat capacity of the lava is 1600 J kg^-1 oC^1. when all the erupted lava cools from the eruption temperature of 1050 degrees Celsius to 15 degrees celsius, the heat released is 2 x 10 ^15 J. I need to calculate a value for the total mass of lava that erupted. Many thanks for any advice

From the equation: HCl + H20 --> H3O+ + Cl- How much H30+ is needed to create a 2.2 decrease in pH for a 50 000L volume of water currently at pH 9.7???

hi guyz am new here! am an incoming third year and i wanted to ask you as early as now coz our school has no net. am from palawan (philippine, too far). what chemistry investigatory project can you suggest for me? guyz i need your reply as soon as possible 'coz i might be going home tomorrow or the next day., thanks a lot.

Is it t-dependent or t-independent and why? I say t-dependent and cited the definition. Not sure that is right, though. TIA

What up, I really need some help on this, I'm trying not to fail - I need to fill in blanks....( [ ] = means I filled it in ) The element called [ chromium ] has an atomic number of 24. Its symbol is [ Cr ] . When an atom of this element has a mass number of 52, the atom contains _________ protons and ___________ neutrons. The most common ion charge of this element is [ 3+ ] . How do I know how many protons and neutrons it has? I looked at periodic table and it doesn't say how many Much appreciated.

how do you solve this for u, thanks u[sinh(cu)]^2 = k where c and k are just constants.