Homework Help

I wish to find how how many grams of CO2 are needed to enrich a room to 1500ppm. I've tried to work it out but cannot figure it out completely. The dimensions of the room are 2.9m*1.9m*0.9m which equals 4.959m cubed rounded off to 5 cubic meters. Then to find how many cubic meters of CO2 are needed this is multiplied by 0.0015 5*0.0015 = 0.0075 cubic meters of CO2 needed. At a temperature of 25C and pressure of 100kPa 1 mole of a gas will occupy 24.79L. 1 mole of CO2 has a mass of 44 grams. .0075 (cubic meters) = 7.5 liters 24.79L/7.5L = 3.3053 grams of CO2 needed? This cannot be correct and I must have gone wrong somewhere could someone help pu…

Hello everyone! I am new to this list but I would like to share a digital library project-AMSER- with all of you. AMSER (the Applied Math and Science Education Repository) is a portal of educational resources and services built specifically for use by those in Community and Technical Colleges but free for anyone to use (and has quite a bit within appropriate for secondary and post-secondary levels). AMSER is a non-profit organization based at the University of Wisconsin-Madison and is funded by the National Science Foundation (NSF) as part of the National Science Digital Library (NSDL). We are a fairly new project, and are constantly adding new resources to our libr…

A couple of questions on my HW.... 1. Is it possible for an open and a closed organ pipe of the same length to produce notes of the same frequency? and 2. There is this problem in which I have to determine the size of an organ pipe and whether or not it is closed. It has 3 natural frequencies. How do I figure it out (My physics book is hardly understandable, and since I'm in an AP class we never really went over it in any depth...)???

Hi i am doing my resistance coursework (gcse) and i am stuck on finding a workplace and how they test for resistance in their products. i wondered if anyone could help!!!!! Please reply asap thanks

Can anyone please help me on these chem equilibrium questions. I just want to make sure if they are correct or not. 1. A chemical system in equilibrium will a. form more products if the the temperature is increased b. have a specific ratio of product to reactant concentrations c. not have any precipitates d. represent a spontaneous chemical process is the answer b? i think it makes the most since. i know it is definitely not C or D. and i think A. depends on whether it is an exothermic or endothermic reaction. __________________________________________ 2. A reaction has a very large equilibrium constant of 3.3x10^13. Which statement is NOT true about …

What format do you use in behavioral primatology? I'm guessing it's either APA or CSE, but I'm not sure. I want to submit a paper on guenon behavior to this: http://www.jshs.org/guidelines.html, but I'm not sure what format to use.

It's not really homework, since this is what I do for a living, but if you are willing to spend 5 minutes, please visit my online visual cognition laboratory: http://vacognition.wjh.harvard.edu/participate.html I put up new experiments fairly regularly, so if you feel like being particularly helpful -- or if you just find it interesting -- you can bookmark the page or join the mailing list. I have a Google Groups mailing list I use *ONLY* to announce new experiments or results from old experiments. You won't get spammed, I promise. Thank you all very much, Joshua Hartshorne Visual Cognition Laboratory Harvard University

Right, so I've got this Thermo assignment, and the question I'm having problems with looks like this: I can work out all the conditions in both compartments before the heating, using PV=nRT. There are two things I'm having problems with, however. Firstly, to find the conditions AFTER the heating, I get 3 unknowns and 2 equations, which is obviously a problem. What I have so far is this: PA = PB, since I'm assuming energy was added to the system slowly enough such that we can take the process to be reversible. Using the ideal gas equation for both compartments, we get nATA/VA = nBTB/VB and we also know that VA + VB = Vtot The unknowns …

The sum of the first 20 terms of a geometric series is 10 and the sum of the first 30 terms is 91, find the sum of the first 10 terms. Um please help me because I am stuck. Immediate help needed!

I want to some explanation about the effect of Axit sulfuric ( solid and hot ) and Au,Pt. Why there aren't any effects of them.

As I have just finished my final examination in this school year, this is also another question I got the answer incorrect, according to the model answer. The question is about the substitution reaction of methane and bromine in 1,1,1-trichloroethane solution. It is a simple one, how many organic products could be obtained from this reaction in maximum? As I know, it is a reversible reaction, that is, for instance, methane could react with bromine to form chloromethane and hydrogen bromine, and vice versa. Hence I think if I consider methane also as a product would not be incorrect, and as a consequence, I got the answer five, namely, chloromethane, dichloromethane, …

This's one of my exam question, the model answer said that noble gases could be obtained from the fractional distillation of liquid air, while I doubt if this statement is correct, though may be due to my misconception. During the fractional distillation of liquid air, after purification of incoming air, the air mainly contain noble gases, nitrogen and oxygen, while the purified air is continuously compressed and expanded, made to a temperature of about 200 'C, which noble gases are not liquefied yet; later the liquid air (containing N2 and O2 only now) is heated and nitrogen and oxygen are obtained at different position of the fractionating column. What I have in…

In my English class, we had to color code the United States by lynchings during the 1882-1968 time period (300+ lynchings=blue, 299-200=green, etc. However, there is a category classified as "less than 100 lynchings or the number of blacks lynched is equal to or less than the number of whites lynched". There also is a separate category for the states with "zero lynchings". Some in my English class say that zero and the former category should be combined, based on the fact that zero is less than 100 and 0 is equal to zero. I am of the opinion, however, that since zero is the absence of a value and you cannot realistically measure non-values of a tangible thing, zero has it…

Hello, maybe some one can tell me some think about Africa? I have some info about it but need more...

hi, i need some help defining pH=-log10([H+]/M), and use the relation upH=|dpH/d[H+]|u H+. i dont seem to find this in textbooks. it will be great if somebody helped out.

My teacher said blue litmus paper stays blue in acids. I checked wikipedia and it said that blue litmus paper changes red in acids. I don't know what to believe Oh and can the blue litmus paper read bases or can it only read acids?

i need some serious help with my 10 page paper..if you are interested in helping please email me at cikaspasoje@yahoo.com...I'm willing to negotiate the price for help, whatever it may be.

I am doing A' level physics, and for one of my courseworks, I am doing a presentation on nylon; its history, properties and uses. I am currently at the research stage, so any pointers would be much appreciated. If you know of any good websites, books, journals, articles or any other pieces of information, which would be of use, then please tell me. Thank you in advance.

Hey guys, i need to make a roller coaster and describe the physics behind it. Anyone no a good program that describes the physics for me and is easy to use. Thank you, zane

As part of a larger problem I need to find the definite integral from -4 to 0 of the function sqrt(16-x^2). I know that I'm overlooking something simple here because I've done harder problems without this much difficulty. I've tried to solve it by substitution by letting u= 16-x^2 then du=-2xdx -1/2du=xdx and from there I don't know how to manipulate the function to substitute the -1/2du. I think that simplifying the function is probably the way to go, but I don't see how to go about it. Thanks in advance.

Hi, first of all I am in grade 11 math so probably for you it will seem kinda easy unlike for me (well, when you know how to solve something it's always easy). Here. This is the most I could simplify it to. Solve for x: 5x^3+6x^2+2x > 9. And please show the steps.

Question: A daredevil decides to jump a canyon. Its walls are equally high and 10 meters apart. He takes off by driving a motorcycle up a short ramp sloped at an angle of 15 degrees. What minimum speed must he have in order to clear the canyon? I've been picking at this one for an hour. I'm sure it's simple.. I realize that The horizontal distance is 10 meters..and acceleration for the x-component is 0. And that the acceleration for the y-component is 9.8 m/s^2. I'm not asking for the answer.. I just need help getting started. I appreciate the help.

I need the molecular formula of oxide of arsenic when it is in its gaseous state and I need to show how I got there. Please help.

Sulfuric acid (H2SO4) is a strong acid, which dissociates when dissolved in water according to the following equation: H2SO4 (aq) → 2H+ (aq) + SO42-(aq) A 0.21 g sample of sulfuric acid is dissolved completely in sufficient water to make 0.25 litre of final solution. Calculate the hydrogen ion concentration (in mol l−1) in this solution. Give your answer in scientific notation to an appropriate number of significant figures. Remember to show the successive steps in the calculation, and to explain your reasoning. What is the pH of the sulfuric acid solution (to the nearest whole number)?

i am in a 9th grade collage prep experimental lab class and i am being taught from a book that is about 30 years out dated and that is not an issue obviously with my fellow classmates because they get it just fine , but for me it is difficult , we so far have studied about measuring volume and mass accuratly and also about characteristic properties such as boiling point, melting point, freezing point, density , and solubility and my exam is in two days and i looked at some of the tested i got c's on and i got alot wrong so i am freaking out.