Homework Help

What happens when you add more sodium ions (Na+) to an isolated nerve? Do you change the action potential? What happens when you add an abundance of potassium (K+) ions? Any help would be appreciated Thanks in advance A

Does anyone has any ideas for my essay? I want want some topic about biology and it is arguable. Thanks you!!

please help me correct my mistakes if i have any how does an observation abut an object differ frm an inference abut that object? when u observe an object, you do not touch it, all you are doing is studying it. When you interfere with the object you are being physical. 21.how are unicellular and multicellular organisms alike?how are they different? they both have basic unit of life. unicellular organism are like bacterias and such and Multicellular is like us. 24.how can a graph of data be more informative than a table of the same data? With a it is very easy to see the data, and much more organized. 25.what is a cell culture?how can a cell cultur…

I need to do an assignment in where I need to research on a Living Environment Biologist. I've searched for hours on google but I havent been able to prevail. I was wondering if anybody could atleast help or just tell me a living environment biologist. I've tried very hard to find one, but I just cant... any help would be greatly appreciated. Thanks

Hi all, I'm giving my niece a hand on her homework but it's been taking me ages to find the answer to this question... "Where can you find the longest food chain? Why?" If anybody here knows a link where I could surf, I would be ecstatic! Thanks a bunch!

I was just wondering if anyone knows where i can find a design for a working wind powered vehicle. Its for a middle school/elementary level science project and as of yet, haven't being able to find a design. Thanks for any help!!

The drawing shows an equilateral triangle, each side of which has a length of 3.77 cm. Point charges are fixed to each corner, as shown. The 4.00 C charge experiences a net force due to the charges qA and qB. This net force points vertically downward and has a magnitude of 524 N. Determine the magnitude and algebraic sign of the two charges. Im trying to solve. Please help me. Thanks.

Hello all, Hope someone can help with this simple problem I'm having rearranging this equation to put X in terms of Y: Y = 2X / (1-4X) Answer given is X = Y / (2+4Y) but I can't see why, can anyone help me out with the intermediate steps? Many thanks!!

The half-life of gold-198 is 2.7 days. After _______ days, 1/4 of the original amount of gold-198 will remain.

Elements in Compound/Masses of Elements X and Y---------------X=0.4g... Y=4.2 g Y and Z---------------Y=1.4 g, Z=1.0g X and Y---------------X=2.0g... Y=7.0 g a. What are the assumptions in solving this problem? b. What are the relative masses of X,Y, and Z? c. What are the chemical formulas of the three compounds? d. If you decompose 21g of compound XY, how much of each element is present? for A, I think compound YZ contains twice as much element Y than compound XY. Also, compound XY contains 5 times more element X than compound XY for B, Do I just have to add the masses? for C, I don't know how to do this one. for D, I'm thinking I have to solve C to sol…

Because of the pressure inside a popcorn kernel, water does not vaporize at 100C. Instead, it stays liquid until its temperature is about 175 C, at which point the kernel ruptures and the superheated water turns into steam. How much energy is needed to pop 95 grams of corn if 15 percent of a kernel's mass is water? Assume that the latent heat of vaporization for water at 175C is 0.90 times its value at 100C and that the kernels have an initial temperature of 175C. The part in bold is what I don't understand.

What does Iso- and Neo- mean in terms of naming organic compound. can you give some examples. thank

Hi again, I am writing a Chemistry report once again and I need some assistance from you. I am having trouble on answering some of the questions. Questions: 1) Why is acetylation of the amine group useful in organic synthesis? 2) Explain why the amine group and its acetylated derivative are ortho/para directors. 3) Aniline cannot be nitrated directly with the usual nitrating mixture of the nitric acid/sulphuric acid because considerable charring takes place. Write equations to show how you might prepare p-nitroaniline from aniline. I have searched around 'Google' but couldn't find anything. Thanks for your help. Dc Nilbog Problems solved. Tha…

hey guys, my mums just gotten into uni, and we're having some difficulty find credible sources for one of her Essays. Any help would be greatly appreciated. The question is: what is meant by the term 'Modernity and what are the main features said to characterize 'the great transformation giving rise to modernity?' All sources need to be referenced thats another factor as to why we're having some issues..as most pages Google returns are not. We've had a look on recommended uni pages, but they are turning up limited results. They're not user-friendly...and even I'm having some difficulty finding results. So I logged onto here cause I know you guys are awesom…

Just been doing some work on acids and bases. I know that when you react an acid with a metal oxide you get a salt and water being produced. But a question I have asks for the equation when you mix lead sulfide and hydrochloric acid. Will you get lead cloride (the salt) and hydrogen sulfide produced? PbS(s) + 2HCl(aq) -----> PbCl2(s) + H2S(g)

Which of the following can you conclude about a particle labeled ? Check all that apply. A. It has one electron. B. It has one proton. C. It is a beta particle. D. It has one neutron. E. It has one nucleon. F. It is an alpha particle. G. It has no neutrons.

what is the alternate method of two point and three point test cross in bacteria?

Hi all, Iv been having real difficulty in finding information on the following question: Q) What are the mechanisms for surviving extreme temperatures in animals, plants and microorganisms. Does anyone know any websites where i can find information on this and any suggestions or answers to the question will be appreciated. THANKS...

I dont really know where to post this so I decided here coz I need help.. Hi, i'm doing my investigative project at school. I have read that the Ancient Romans used urine to clean their clothes so I came up with this idea; to make a laundry detergent with urine as a main component. My problem is how would I make one? I prefer having powdered detergent but liquid detergent might work too. But my problem is what would I mix with the urine to make a detergent..? That's all.. Thank you for those who would help.

Please tell me how to derive bayes rule for the following: if f(x) is from standard normal {N(0,1)} and g(x) from normal distribution with mean m and variance s^2. also want to know how to find the bayes error

I have an equation 13.8 = 5 lg 1000r / 10 + r. I know this can be written as lg r = -0.2r + 0.76 but I cannot figure out how this is achieved. It's been forever since I've done any maths and honestly I seem to have forgotten a lot about what I learned at school Could someone do a step by step demonstration of how to get from the first equation to the second so I would understand where the 'result' comes from. Thank you!

Hi there, i've just registered with these forums, so this is my first post. I thought this would be a great place to aid me on my scientific career, so firstly I just wanna say Hi. Secondly, well, the main point of this post is because I am stuck on an Organic Question; questions that I need to answer in a laboratory report write-up. Here are the methods that were executed during the experiment: [size="3"][font="Arial"][b]PREPARATION OF AN ALKYL HALIDE (N-BUTYL BROMIDE)[/b][/font] [/size] >This preparation involves the conversion of an alcohol (1-butanol) to a haloalkane (1-bromobutane). [font="Arial"]Equation for this experiment:[/font] …

A simple reminder to all: this is the "Homework Help" forum, not the "Homework Answers" forum. We will not do your work for you, only point you in the right direction. Posts that do give you the answers may be deleted. This site is for helping you learn more about science, not for helping you cheat on your science homework.

Hi, i have been needing some help in Genetics. More to do with the processes if mitosis and meiosis. I have these 2 questions which i am unable to find answers for. Please help me. The questions are as follow: Explain why mitosis would not be able to produce functional sperm or egg cells Discuss how meiosis produces this variation and why this is important. Thanks:D

What is missing in the following nuclear equation? A. alpha particle B. beta particle C. gamma particle D. proton