Homework Help

1)For which of the following reversible reactions Kp may be equal to 0.5 atm and how? a)PCl5 ---------------> PCl3 + Cl2 b)N2 + 3H2 ---------> 2NH3 c)2NO2 ---------------------> N2O4 2)A 1 litre container contains 2 moles of PCl5 initially. If at equilibrium Kc is found to be 1 the degree of dissociation for PCl5 is ? I am getting the answer as 1 but in the book its given as 1/2

(1-x^2)^(1/2) -------------- (4-x^2)^(1/2) One minus x squared divided by 4 minus x squared all under a square root sign. My teacher says the domain is (-inf,-2) union [-1,1] union (2,inf) Is it necessary to include the [-1,1]? Wouldn't it be obvious that function is valid at that point? I have a tough time deciding when to include those terms How do I know when to include the infinity and such?

1. The problem statement: A - something that is a known possibility C - correct conditions conducive to produce A T - many trillion years in which B proceeds 2. My question: Is it true that with the above factors the probability of "A" is "1", or very close to 1? 3. The attempt at a solution: This is what I believe Professor Steven Hawkins said about a meteor or comet striking Earth.

The aminoacid glycine is often used as the main ingredient of a buffer in biochemical experiments. The amino group of glycine, which has a pKa of 9.6, can exist either in the protonated form ( -NH3+) or as the free base (-NH2), because of the reversible equilibrium R-NH3+ Û R-NH2 + H+ a) In what pH range can glycine be used as an effective buffer due to its amino group B) In a 0.1 M solution of glycine at pH 9.0, what percentage of glycine has it’s amino group in the NH3+ form? c) How much of 5 M NaOH must be added to 1 L of 0.1 M glycine at pH 9.0 to bring its pH to exactly 10.0? d) When 99% of the glycine is in its –NH3+ form…

A man used a hydrogen-filled balloon to fly from Paris 25km into the French side. What’s the mass density of hydrogen relative to air at the same temperature/pressure? What mass of payload can be lifted by 10kg of hydrogen, neglect the mass of the balloon?

1)The torque of the weight of any body about any vertical axis is 0. Is it always true? 2)A sphere rolls on a horizontal surface. Is there any point of the sphere which has a vertical velocity? 3) When several forces acts on a particle we take the torque of the resultant force. Is this result valid for the force acting on different particles of a body in such a way that their lines of action intersect at a common point ? 4)In pure rolling angular velocity is independent of the distance r from the axis of rotation. Why ?

My teacher hasn't explained much, and I'm not sure how to get the answer to these problems. If a projectile is fired straight up at a speed of 30 m/s, the total time to return to its starting point is about___. Supposedly the answer is 6 seconds, but I don't see how. Wouldn't I divide 30 m/s by the acceleration of gravity to get about 3 seconds? Also, I don't understand the answer to this one: The vertical height attained by a basketball player who achieves a hang time of a full one second is about___. and the answer is supposedly 1.2 meters. I tried to substitute the values into the equation [math] d= \frac {1}{2}gt^{2}[/math], where g is approx. [math]…

How to calculate the motion of ions in a magnetic field ?

First, I'm new to statistics, so I only know the very basics like the SD, mean, mode .etc. I've conducted an experiment so that I have two sets of data in hand, I want to know if the difference observed in the experiment set and the control set is significant or not. If I have the sample size, mean and SD of each group, could I calculate the confidence level. Someone suggested T-test and p-value, I surfed the internet for info, but I just cannot grasp the idea clear, so could someone explain them to me? Any help would be appreciate a lot, thanks.

Tell how to check whether a linked list is circular.

MY KIDS WANT TO KNOW IF YOU CAN MAKE POTASSIUM CHLORIDE WITH SALT?? AND HOW??

I have some limit problems and I'm not sure how to do it. I already have the answers so I'm not asking for answers but the "how to". lim (1/x)-(1/3) ----------- x--->3 (x-3) lim (t+4)^(1/2)-2 t-->0 ----------- t I always end up getting 0/0 on all the fractions. I'm not sure what to do for these. Thanks!

What would be the observed movements? for a motile bacterium and a non-motile bacterium using the hanging drop technique?

There are two flasks connected by a stopcock. One flask is 2.00 L and is filled with H2 gas at 360 torr. The other is 1.00 L and contains n2 gas at an unknown pressure. When the stopcock is released, the final pressure, at 3.00 L, is 320 torr. How would I go about to find the unknown pressure of N2? I know it's rather simple, but I cannot for the life of me figure this out, no matter how much I read my old notes or my book (Zumdahl/Zumdahl). EDIT: So I tried some different problems and I think I've finally found the solution. I got 240 torr as my answer and am fairly sure it's correct.

Hi, I have some summer physics work to do online and I've come across what I believe to me a mistake in the site where I do the problems. However, before I send the teacher an email I want to be sure I'm not making some simple mistake. The question in question is #2 at http://wps.prenhall.com/esm_giancoli_physicsppa_6/16/4351/1113975.cw/content/index.html. Note, the numbers involved in the problem change every time (except for the angle in #2 which is always 30 afaik). The equation I've found is: (V^2)/(2 * g (Sin(D) + u)) Where: V is the starting Velocity, g is the (positive) acceleration from Gravity, D is the angle in Degrees, and u is the kinetic friction …

Hi everyone, I basically want to know how you can determine an unknown from a calibration curve? this is not my homework or anything but i want to know for my own knowledge, i have tried researching on the internet but no good explanation, does anyone have a link to a site which explains this in a easy way ? Thanks

Hi all, how can you minimize errors in an experiment ? (factors effecting permeability of beetroot)? in relation to these things: tissue preparation, timing errors, reading of absorbance values any ideas

Hi all, I am studying for a physiology exam, and in my notes I have written that "the increased extracellular ionic concentration that osteoblasts form support nucleation and growth." I understand everything in this except for the nucleation part. I've been looking into it and I believe it has something to do with the formation of hydroxyapatite, but I have no idea how. If anyone has any insight on this it would be greatly appreciated. Thank you in advance.

Q: The central mechanical component in automobile engine is a piston-cylinder assembly, which allows the working fluid to function properly. Consider such an assembly with air as working fluid. The cross-sectional area of the piston is 0.1 m2. Initially the piston is at 1 bar and 25 C, 10 cm above the base of the cylinder. In this state, the spring exerts no force on the piston. The system is then reversibly heated to 100 C. As the spring is compressed (the spring is connected to the top of the piston), it exerts a force on the piston proportional to -kx, where k = 50000 N/m and x is the displacement from its uncompressed position. Air is assumed to behave as ideal gas. T…

Hey there I'm currently studying biology at university (1st year) and we have been given a scientific paper to summarise. What I need help with is finding out what 'mitochondrial and nuclear loci' are. Here's the abstract - If you could explain to me what they mean by these two terms and how they are being used in finding the genetic variation of fin whales that would be much appreciated. Thanks again.

I did an experiment recently (don't laugh) where I showed pigeons videos of another pigeon solving a problem. There were 6 groups of 4 birds each. The first group didn't see the video (control), the second group saw it once, the third twice etc. etc. etc. Now that I have this data, I have absolutely no idea what sort of analysis I can do with it...and I am not familiar with many tests either. Can anyone help me here?| My data table looks something like... Groups: 1 2 3 4 Pigeon 1 results Pigeon 2 results Pigeon 3 results Pigeon 4 results with each Pigeon 1-4 being a different pigeon in each group...if you understand what I'm saying haha

Hi, Just need a bit of help putting things into conjugate normal form(for those who have forgoten, here's an example: [math](x+y+z)(x+y'+z')(X'+y+z')[/math]) I can manage to put things into the disjunctive n.f. easily, but for some reason am unable to change it to Conj. n.f. Can I just use the duallity principle on the disj. n.f.? I think I can do it by adding things like z*z', but I only seem to be able to get it to the disj. n.f. Yes, I know you're probably sick of me now, asking all these questions and not putting anything else back in to the system, but there's nothing wrong with learning, nor with wanting to learn, is there?

I have got some class VIII homework questions which I am not able to answer. Can someone please help me out with them? 1. Which force is responsible for raising our body hair when we try to take off a terylene or polyster shirt in dry weather condition? 2. An object experiences a net non-zero force. Is it possible for the object to travel with a constant speed in a straight line? 3. When we throw a ball upwards, what happens to its speed while it is going up? Give reasons for your answer. Fill in the blanks: 1. To draw water from a well, we have to _______ at the rope. Please note that all questions are from the lesson "Force & Pressure". …

You are offered to finance a compressor , with a nominal interest at 8.2% compounded monthly. YOU PAY £590 PER MONTH FOR 134 MONTHS. Estimate the total amount of money to be paid . I would like some help in this ,i was m trying to do economics exams preparation .i would like can someone suggest me a solution or which site should be helpful. i would be very thankful, plz tell me if i m wrong what i did is i multiplied 11.2 yrs by 8.2 then multiplied £590. is that the correct way. Maqbool

My Dear fallows belongs to Pakistan and I have lots of Project source code of different natures projects, I want to sale these types of projects, any one can help me to sale out and purchase my projects source code.