Homework Help

I'm confused about how to write the electron config for transition metal ions. From what I understand, I would strip away all the highest s-orbital electrons. If the resulting charge is more than the stated ionic charge, then I add the missing electrons onto the d or f orbitals... is this correct? So Ni+ would be [Ar]3d^9? What if the element has an f orbital too, such as Ce? How would I write the charge for the ion for Ce+? Thanks!

All I need is to run a certain section of my code (that loops forever) for a certain amount of time, about 10 seconds. The obvious problem is when it gets to that section, it loops forever and doesn't move on. Is there a function that will allow me to run a given chunk for a given amount of time? Thanks

Hi all, I'd greatly appreciate some assistance with my unknown identification. I've attached my spectra to this post. So far, I know that the molecular weight is 151 and that there is a benzene ring (indicated by peak in mass spectra at 77). I also think that there is a carboxylic acid present since there were peaks at 1698 and 3147 cm-1 in the IR. I've also made some other notes on the spectra, but I'm not entirely certain if they are accurate or not. I believe the formula should be C8H9NO2, but I'm having trouble fitting the pieces together and drawing the actual structure. Any help you could offer would be amazing! Thanks in advance! Scanned_20141126-0011.…

I'm supposed to balance the following equation: [latex] HCl + As2O3 + NaNO3 + H2O -> NO + H3AsO4 + NaCl [/latex] Anyways, I got stuck stuck here... [latex] HCl + As2O3 + NaNO3 + 3H2O -> NO + 2H3AsO4 + NaCl [/latex] No matter what I do I couldn't get H and O to balance out at the same time! When I balance O, the H is out of balance, and when I balance H, O is out of balance! Augh! How do I do this? Ok, I have solved it to here... [latex] 2HCl + As2O3 + 2NaNO3 + 2H2O -> 2NO + 2H3AsO4 + 2NaCl [/latex] There are 11 O on the right and 10 O on the left. ... Now what?

If anyone could give me some guidance in answering these questions that would be amazing. Obviously the answers in the screenshots are incorrect. Thank you thank you!

I have a problem and I have the answer and the method in the book but when in put it in the calculator or excel or google I get the wrong answer The problem is An average family f four uses roughly 1200 liters of water per day. One liter =1000cm3 How much depth would a lake lose per year if it uniformly covered an area of 50 square km and supplied a local town with a population of 40000 people? Consider only population uses and neglegt evaporation and so on So I started my calculation and according to the book I did them right but my answer is not right. 40000 people(1200 L/d/4 people)(365 days/1 yr)(1000cm3 /1 L)(1km/10^5 cm) My calculation= 43 800 00…

I understand how pressure is a function of temperature, but not how temperature a function of pressure. My notes have: initial volume / initial temperature = final volume / final temperature. This seems to mean that adding pressure increases temperature. But how does pressure increase the average kinetic energy of the air molecules? I can understand how increasing the average kinetic energy of air molecules increases the pressure on the walls of the container. But vice versa doesn't make sense to me.

How do you evaluate the first and the second moment for 1,2,3 dimensions? I attached a picture with the equation.

I'm doing a dissertation (BA philosophy) about the impact of technology on a person's psychology- in which i have raised the humoral theory as a sort of metaphor for technology's effect on the latent part of our minds. Since i know that it is not scientifically valid- can anyone enlighten me on any current science terms that relates to our body's chemistry (like too much serotonin etc.)? Even just a particular term that i can research into, so i can offer some current science.

Hi Guys, I am pleased to join this forum to learn something from experienced guys and thanks in advance for helping me to understand physics. I am trying to design a Ferris wheel with maximum SPEED and maximum PASSENGER capacity. I want to know formula to calculate MOTOR POWER IN KW to rotate that Ferris wheel. Here are general specs of the wheel. Diameter: 106 Meter Radius: 53 Wheel total weight: 1000 Ton Exclude Wheel standing structure: 30% Rotating Wheel weight: 700 ton (Everything including spindle, hub, bearing, spoke cables, rim, cabin, riders weight, etc) Minutes Per Round: 10 (1 round completed in 10 minutes) Round Per Minute: 0.10 Wheel Speed: .55 meter per …

I keep getting n = 3 for the origin, but the answer is n = 6... what am I doing wrong? Question: Given that the wave number of a line in the Paschen series of hydrogen is 9140 cm^-1, what is the origin of the electron (what energy state?) My method: wave number = 1/(wavelength) = 9140 cm^-1 = 91.4 m^-1 lowest state for Paschen series is n = 3, so n-final = 3 Since this is emission... E = (2.1799 x 10^-18)(1/(n-final)^2 - 1/(n-initial)^2) (plank's constant) * (speed of light) * (1/(wavelength)) = (2.1799 x 10^-18)(1/(3)^2 - 1/(initial state)^2) Solving for n-initial... n-initial =3. I know this is wrong, but I don't know what I did wrong.…

Attached is the question and the result I have got so far. I have used cylindrical coordinates to get so far (my equation is clearly marked in the attachment). However, I am having trouble converting it to Cartesian coordinates. r would give Pythagoras's theorem which is not like the function I'm supposed to prove. I would be so grateful for some pointers. For starters is my function even remotely close? Many thanks

I thought I was doing this right until I saw the answer in the back of the book.... is it a typo, or am I doing something wrong? Question: Assuming that the smallest measurable wavelength in an experiment is 0.10 femtometers, what is the maximum mass of an object traveling at 100 m/s for which the de Broglie wavelength is observable? My method: equation: wavelength = (plank's constant) / (momentum) wavelength = (plank's constant) / (mv) 0.10 * 10^-15 m = (6.626 x 10^-34) / (m * (100)) Solving from m... I got 6.6 * 10^-20 kg? But in the back of the book, it says 6.6 * 10^-29 kg? Did I do something wrong? Or did someone typed 9 instead of 0?

A blend was made from types of tea, X and Y, so that the mixure contains 20% of type X. If the quantity of X is doubled, find the percentage of type X in the new blend, given that; (i) the same quantity of Y was used; (ii) the total quantity of the mixure was unaltered. How can I tackle this?

Hello, I have a question whose answer I need in order to check the veritability of my results. If you introduce in container A-1, some water, some gram-negative bacteria, and some Lysozime, after which you incubate it... will the water get cloudy or will it remain clear? If in container A-2 you put water, the same gram-negative bacteria, and some buffer solution (ph 7) will it remain clear or become hazy? If in container B-1 and B-2 you do the same things, but with gram-positive bacteria, what will the outcome be in their cases? Practically I need to figure out which will be hazier than which and which will be clearer than which o,,,o Could anyone please …

Hello, Can somebody help me... A mass m is attached vertically to 2 springs, one spring at the ceiling K1 and the other one on the floor K2. What is the normal mode angular frequency for vertical motion? I found sqrt(5*k/m) but it don't seem good... Thanks.

I have an unknown sample of iron II I have the mass and I have done the titration with KMnO4. I mixed the sample with 100 mL of distilled water and then used 25 mL of that and addes 30 mL of distilled water, 30 mL of 3 M H2SO4 and 2 mL of 85% H3PO4. I need to find the balanced equation of the titration but I just can't seem to figure it out I understand that I first need to find the limiting reactant, but this is the one part of the entire report that I am having problems with and I just cant figure it out. Can somebody please point me in the right direction here? The mass of the iron is 2,2068 g if that matters

I checked the electronegativities of the intermolecular forces, and the difference between fluorine and hydrogen is 1.8, much higher than oxygen and hydrogen which is 1.2. So there must be another reason other than hydrogen bonding why H2O has such a higher boiling point than HF, which is only 19.5c. Also, why isn't HF called hydrogen monoflouride?

1) The vertex A if a square ABCD is at the point (6, -4 ) . The diagnol BD has equation 2y-x=6, and the vertex B is nearer to the origin than D. a)calculate the coordinates of the centre of the square. b)calculate the coordinates of B and C. 2) Calculate the coordinates of the centre of the circle that pass through (0,2) , (4,8) and the origin O. I attempted 1a and 2 and got random answers... which were not on the answers page. I couldn't do b. pls can someone show me the actual working as i can figure the answer on the answers page anyways i need to know how to work these out - they're hard :/

I'm discussing intrinsic bacterial resistance for a class discussion and wanted some input. For intrinsic resistance, I gave the example of Pseudomonas aeruginosa. Is it correct? The pumps aren't acquired in this bacteria, but are intrinsic, right? Please someone help. Thanks

I have some questions on real solution.. Question 1: First statement: Correct (fact) 2nd statement: Unsure (False? because of azeotropic mixture at its azeotropic composition boils at a constant temperature?) 3rd: True (fact) 4th: Unsure?? (False? because of azeotrpic mixture?) 5th: True (I think so?) Thanks

I try and do my problems by myself as opposed to running to this forum but once again I have simply come across something that has me stumped. This will be the third time I've posted here this semester. Hopefully I'll get better by the end of the year otherwise final exams are going to be shaky. I have been asked to calculate the rate of the reaction of deuteron fusing with a proton. My units don't seem to add up as I have a kg^-1 extra at the end. I also know that the rate is wrong because the next question asks to prove that the mean lifetime of deuteron in this reaction is one second. When I divid the number of deuterons by the rate of the reaction and it is way o…

A retailer has an account for N200.00 from a manufacturer who give two months' credit but only after a cash discount of 5% for prompt payment. The retailer borrows N200.00 from his bank at 9% per annum for two months and pays promptly to secure the cash discount. How much does he gain by this transaction? How do I solve this? I could not solve this because I don't fully understand the problem especially the first sentence.

Hi, I just want to ask if doubling dilutions are the same as serial dilutions ? I have tried researching them but I have got more confused! Thanks in advance

hello , i am learning about forces . there is a digraph in the text book showing the friction on the wheels of a bicycle . i want to ask why the back wheel with the petas and the front wheel has a diffeernt direction of friction ?? thank you