Homework Help

Gravity makes things move, does it have energy?

This is from a practice test my teacher gave me. Which would be a better solvent for I2? C6H6 or CH3OH and why?

I have to find interesting things about bromine, but I can't find anything that really captures my attention besides it's a liquid at room temperature. Do you know anything that you find interesting about it?

I have to do a project in Pre-calculus on careers that use math. I was wondering if someone here has an interesting job that deals with math? I have to have an interview.plz help me! thanks

1) What is being done to stop this? 2) Why do plants that live longer tend to move slower up? 3) Why don't the plants just adapt to the temperature change and stay where they are?

Hi, as you can probably tell with one of those handy post counts (or the like), I am new here. Be nice. =) I am also a high school student (senior year :[ ) so forgive my ignorance regarding anything you say. Erm. I just have a quick question; I've performed an experiment to test for starch and sugar with amylase, starch, and glucose solution. And theory says there must be starch somewhere (it is starch solution. How can there not be starch? Unless there was a problem with starch, but I'll get to that later). I use iodine, and there is no starch. For any of my trials. And I really think the starch was fine, because I put amylase with the starch and it gave…

I'm working with density, and the question asks to figure net mass. I'm not sure how I'm supposed to do that. Am I supposed to take the mass of the empty graduated cylinder and subtract that from the amount of mass in the graduated cylinder when filled with something? For example, the beginning mass is 25.419 and the ending mass is 34.210, therefore, the net mass would be 34.210 - 25.419 = 8.791. Is that the correct way to figure net mass?

Hey again guys, My second physics course also deals a lot with some math I haven't really dealt with before. This time, though, it's a bit more practical question rather than the 'principle'. I actually understand the principle, but the question doesn't work for me - I think I got confused somewhere, and the book's not much help. My professor is writing ineligible script on the board and in the hw assignments, apparently he forgot that there are non-Americans in the course (I'm nto the only one) who have trouble reading script. Damnit. In any case, here's the problem (hopefully I translated the script right, took me a while): So, I know this is a question…

Hi, I'm in a master's program in Biochemistry, and been out of school for a while, however when I was an undergraduate had the same dilema. Could anyone explain or refer me to a resource about the glycolytic pathway. I'm googled many of them however, doesn't state how you actually get from one to the other, just gives a flow, how about how does it occur, where did the electrons go, and how did glucose 6 phosphate go to a 5 ring structure? What happened? Is is sig far as knowing going from a ketone to a ketose? Please help.

Hi Members: My name is Sharon and I am just new to this forum. I have an important presentation in my school regarding the "Industrial production of vitamin D and Erythromycin: I searched the internet to find some information on this, but I could not succede. I would be very happy if anyone of you can tell me either a source or send me some detailed material on this topic. The Question is: What is the procedure involved in the production of 1. Vitamin D and 2. Erythromycin on the industrial scale? If you guys have any material relating to this, please email me to: sharon.micb@gmail.com Thank you. Regards, Sharon

I had the following question in a maths exam the other day [math]xy = 10[/math] and [math]x^2 + y^2 = 61[/math] HOW DO I DO THIS, IT'S DRIVING ME MAD BECAUSE I CAN'T FIGURE IT OUT! I tried just the primitive guess and check method, but IT DIDN'T WORK! can you please give me some help?

I would like to ask about which of these compounds hydrolyse at the fastest and slowest rate? 1.Acid chloride 2.Amide 3.Anhydride 4.Ester I'm not sure if its ester or anhydride hydrolyses at slowest rate. Thanks

What mass of chromium metal can be produced in 1.00 h by the electrolysis of K2Cr2O7 solution using a current of 15.0 A? I know the answer is 4.85 g but how do you get that?

I searched for a similar thread, but couldn't find anything. I have my first exam (in 14 years ) which covers physics i.e kinematics to basic QM and practically everything in between...so a lot to go over. This course consisted of 7 books roughly 250 pages each. I've worked out a revision strategy, such as going over chapter summaries and refreshing my memory on information, which I've forgotten or had trouble with. Setting aside a day each week to practice the math, as well as collating the main principles. I'm also going to answer as many questions from each category for practice, which are on a DVD I get with the course, as well as tackling a specimen exam pape…

discuss effect on the c.m.c of: -length of the hydrocarbon chain; -the addition of the inorganic electrolyte to the solution of an ionic surfactant

I am a year 10 student. This is not acctually homework, but I want to know how to do logaritims and matrix mathematics. can someone try and explain this to me?

can anyone give a way to find the difference of a fish bone (in content and such) in contrast to other bones(like chicken, pork, etc.)?

Hello, This is the first time I have posted to these forums. It looks like an organized community, so I thought I might ask a question about something I cannot figure out. We did a lab in my chemistry class a few days ago, and it was about physical and chemical changes of matter. I am trying to figure out what was left in a dish after we evaporated some chemicals. The process to get to this point was: 1. We placed 3mL of HCl and a piece of foil into a test tube, and then quickly put our thumb over the opening to contain the pressure and speed up the process. After our thumbs could not hold the pressure, we quickly took our thumbs off and held a flaming wooden stic…

Math and word processor for note taking and homework, know any? I've been using word 2007 for few weeks now, and its very annoying, VERY! By the way, it's important to me that it has easy accessible word editing features too

1. when placed in H2O, a sodium pellet catches on fire as hydrogen gas is liberated and sodium hydroxide forms. i put chemical change 2. evaporation i put physical change 3.pancakes cooking on a griddle i put physical change 4. A tire is inflated with air i put physical 5. luster i put chemical property 6. odor i put physical property please help

How does a porous pot work in an electrochemical cell?

how to check differentiablity of |log|x|| im not able to solve its limits.

1. A iron tyre of diameter 50cm at 15 celcius is to be shrunk on to a wheel of diameter 50.35cm. to what temperature must the tyre be heated so that it will slip over the wheel with a readial gap of o.5mm? (Linear expansivity of iron is 0.000012/k) 2. The difference in length between a brass and an iron rod is 14cm at 10 celcius what must be the length of the iron for this difference to remain at 14 cm when both rods are heated at 100 celcius? (linear expansivity of brass = 0.000019/k, Linear expansivity of iron= 0.000012/k )

if x=a([math]\phi[/math]+sin[math]\theta[/math]), y=a(1+cos[math]\theta[/math]). what is d2y/dx2? the answer come out to be -a/y(sq.). im not getting it!

Currently, I am working on a homework assignment involving an iguana and the acceleration of it's tongue to catch prey. For some reason, though, my teacher did not go over some parts of it, and neither does the book, and I cannot find the definition for "the magnitude of acceleration". I know of course that acceleration is V/s, but fail to see exactly what "the magnitude" means. Can you please help? Please and thank you.