Homework Help

ok so we have to explain some results from an experiment where beetroot discs are placed into different concentrations of oxygen. Here they are: concentration of o2 2.7 12.2 20.8 Relative absorbtion of -K+ 22 96 100 I don't really understand this and would appreciate some help!!! Thank you for your time.

Sorry if this has been asked before, we've got a lab tomorrow, we have to take some different hydrate compounds and heat them up with a bunsen burner. We are supposed to figure out a way to know if all the water has been driven off, I just can't think of anything...besides until the compounds start burning, and that isn't good Is there a trick with temperature? I'm very puzzled Thanks in advanced for some hints Edit: So I've thought up heating it slowly, and by looking around on the net, keep weighing it till it stays at that constant weight...I think that's it. Might be a better way though.

Latly i havent been able to find anything that is current with science and i as hoping somone had an idea of what current events have been going on in science plus im in 9th grade so dont come up with anything too complicated ok.

I am currently doing an essay on this topic. However I have came to a problem. I can't seem to find any info on which part of acetaminophen that reacts and performs the analgesic function. Is it possible to give me few hints on this? (It has a chemical formula of C8H9NO2) Also, a lot of sources indicate the lack of reaction of COX-1 and COX-2 to acetaminophen. And some suggest COX-3 is the key. Since it is first made known to public in 2002, not a lot of info can be found. Can anyone point me to the right direction for searching for its info?

Can some1 plz tell me that apart from m = Q x e.c.e = density x V, is there another way of finding the thickness of the layer of copper that is deposited on the cathode during electrolysis? (when u already know the density of Cu, the surface area of the anode, voltmeter and ammeter readings at a particular time and Q). By the way, i am in grade 12 in QLD, Australia so plz dont tell me something complex learnt from uni. thanx (oh...if u think there isn't or if u know for sure there isn't then can u plz tell me)

"Assess the effects of sunspot activity on the Earth's power grid and satellite communication." That is something along the lines of what I need. All I need are some webpages that may answer the above statement. If you may know a good site that includes this information please put it down for me! That is all I need!! Much Appreciated..!

Hey All - new poster here and would gladly appreciate a push in the right direction for my Global Environment class...I'll set up the problem and show you the work I have done so far... Question: Imagine a hypothetical population with three assumptions: 1) Males and females are in the same abundance in all age classes beginning in year 0 2) Newborn males produced @ the same rate as newborn females by mothers of all ages 3) Males and females have same per capita survival rate in all of the different age classes After knowing this I am supposed to find out how many males of each age are present in the population starting @ age 2... Ok what I have done …

I have been brainstorming ideas for a design of an "egg catcher". This is not the traditional "egg dropper" but instead, i need to build a device that will catch an egg in freefall and bring it to a stop without breaking it. The restrictions are only that it is not more than 1 meter tall, and that it does not weigh more than 40kg. The raw egg is going to be dropped from 30 feet approx. I though that using air as a cushion would be best, so i think what i might try is to get a leaf blower and stand it up-right. Then i will affix a mesh bag or something to the end of it so that the egg will fall into the bag and the air will slow its decent gradually (maybe even s…

Which organelles do mesophyll cells have more than root cells of a plant? Do Onions have chloroplasts?

In class, Ive we've all been given mini-debate topics about various UN topics. Mine was about the Rights of The Child conference. I have also been given the affirmative position thereby standing behind the US adopting and ratifying the convention. The problem is that I dont have too great of an arguement for the US to adopt it. I have a feeling that my opposition will be arguing that it is anti-family. http://www.unhchr.ch/html/menu3/b/k2crc.htm That is the actual conference. Any help is appreciated!

--------- Sorry for the thread, just found an amazing website with lots of info. Sorry again.

yes, yes, i know...the question seems really dumb, i don't even know what branch of science it is. but i can't change my science project any more....please...... i've been searching the internet for hours, i cant find anything....so, do words affect our sense of taste? Like, if you give someone 2 cookies(exactly the same) and say that one of the cookies are better, will it make them think that way?

Hey, in our physics class, we're using lasers for an application of trigonometry. Anyways, today we were supposed to find out the height of a tower at our school. I thought we would be using lasers to figure it out, but we won't. To do it, I believe you need a side and an angle. My friend says to use a straw and look through it as a telescope to aim it at the top of the tower while you're close to the ground, then measure the angle. Then measure the distance you are from the tower and that should be enough to figure out the height. This method would give a relatively accurate measurement since the tower is pretty tall. But is there some other way to do i…

Does anyone know of any good websites to learn physics( or any other science for that matter) on their own?

If 2 is the repeated equal root of a quadratic equation, Is that common to say that the equation has two postive roots?

I've got a test tomorrow. As I was working on some of the review problems, I came across two I couldn't answer: [math]\lim_{x \to 0} \frac{sin[(\pi/6)+\Delta{x}]-(1/2)}{\Delta{x}}[/math] [math]\lim_{x \to +0} \frac{csc(2x)}{x}[/math] Please help with an analytical proof. Oh, and how do I type the symbol for "all real numbers".

I Know This Is Stupid But I Dont Understand? Can Someone Please Give Me A Website That Could Teach Me How To Do This? Or Atleast Give Me Some Good Examples? I appriciate it alot. Thanks.

HI! I am new to this forums and this is my first post. Look, I have a homework problem that I hope you guys know how to figure it out. Here it is: Recently, Dr, Frank has suggested that EArth may be pelted by thousands of house-sized comets. When Frank first considered the idea of mini-comets falling to earh , he no doubt tried to make a quick calculation. Comets are like dirty snowballs that evaporate when they enter the atmosphere. Oceans have accumulated from these comets over the years. Use the following information to estimate what percent of Earth's oceans could be accounted for givena constant bombardment by comets over the last 4 million years: 1…

Hi. I'm new to the forums. Anyways, how are silicon wafers made? I searched the internet and can't find much information. Some are confusing me. I need to make a paragraph or two on the creation of how silicon wafers are made. So far, I have 2 paragraphs and in it I talked about distilling and purificating silicon dioxide. I don't know If that's enough. Each thing leads to something else from the websites I've read and I only need to to explain how silicon wafer are made. Some come from what I wrote so far which is the distilling and purificating silicon dioxide then all of a sudden x-ray visions come up. Any help please?

I was wondering of the characteristics that apply to all organic compounds. This is for a lab report. All i could get was the composition of carbon. Any help is appreciated

I was doing my thermo chem assignment, and I got completely stuck on this question, can anyone help please? "Calculate the second virial coefficient of methane at 300K and 400K from its Van der Waals constants given that a(CH4) = 2.283 L²·bar/mol² and b(CH4) = 0.04278 L/mol."

1. construct DFA's for the following language a, The set of binary strings beginning with 010 and ending with 100 b, the set of string over {0,1_ which do not contain 0110 as substring c, the set of strings over {a,b} such that the fifth symbol from the right is a d, the set of binary strings containing at least two 1's and most three 0's 2. for any language L let L1/3,* be the set of all first thirs of strings in L i.e, L1/3,* = {x | Ey : |y| = 2|X|,xy E L}. show that L is regular, then so is L1/3,*.

Living cells require energy for the activities of life. Energy is released in every cell by the process of Cellular Respiration. In this process glucose is oxidised to produce energy. Gases need to be exchanged between the cells undergoing Cellular Respiration and the environment. In most organisms these gases are oxygen and carbon dioxide. You are to compare the structures and processes involved in gas exchange in an Angiosperm, Insect, Fish, Amphibian and a mammal. - The purpose of gas exchange in these organisms - The structures involved for exchanging gases in each of the above organisms. - How gases are exchanged between the organisms and its environ…

Here is the question: Displacement for an object in metres, x, is given by the equation: x=1.5t^2 + 4t + 2 Find the average velocity from t=2 to t=4. Now, every single person in the class, including the teacher, did this method: t=2: 1.5(2)^2 + 4(2) + 2 = 16 t=4: 1.5(4)^2 + 4(4) + 4 = 42 (42-16)/(4-2) = 13 My method was this: t=2: 1.5(2)^2 + 4(2) + 2 = 16m over 2 seconds, or 8 m/s t=4: 1.5(4)^2 + 4(4) + 4 = 42m over 4 seconds, or 10.5 m/s Therefore, the average velocity from t=2 to t=4 would be: (8+10.5)/(2) or 9.25 m/s Essentially, the first method gives the average DISPLACEMENT from 2 to 4, whereas my method is giving the average VELOC…

Hi, Can anyone give me any links or informations about "Crystal Glazing". It has been almost 4 days since I tried to find the links via search engines. But not even one could satisfy the root of the topic. I'm a new member to this forum. Can anybody there from Ceramics field? If there are, then please I need your help. regards, Suresh