Homework Help

Hi, My question is: if you were to make a solubility table, how would you make one. Im in grade 11 Chemistry. I was thinking, dissolve every element/compound into water and see if they are aqeuous. Then we can tell which metals/compounds are insoluble or soluble with each other. For Ex. Magnesium and Hydroxide, Mg(OH)2 Magnesium is insoluble with Hydroxide. How do we assume that because Hydroxide does not dissolve in water, it is insoluble with magnesium. please explain in simple terms >_< ty!

I did a DNA extraction of a fruit where I basically blended it, add enzymes to destroy membrane and then after I did that we had to put it into hot water. What does this water do?

1.(a) Define reduction (Give three different definitions) 1.(b) Define oxidation (Give three different definitions) 15. A dry cell has a limited life. Describe two possible reasons why this may be. For question 1, I believe I know two definitions for both terms: Oxidation is a loss of electrons in a redox reaction; Reduction is a gain of electrons in a redox reaction; Oxidation is the addition of oxygen to a substance; Reduction is the removal of oxygen from a substance. If those are right, I'm confused about the third. Thank you in advance.

Two pieces of wood, both one meter long, are attached with a hinge; the angle formed by the two pieces of wood is termed theta. When theta is pi over two radians a string is stretched attached to the ends of both sticks such that its length is exactly square root of two. A block is used to hold the pieces of wood such that theta remains constant at ninety degrees then the apparatus is hung from the ceiling such that when the block is released the pieces of wood will close together and the string will fall in a perfect arc. The block is removed. As the pieces of wood fall together we imagine the line AB completes the triangle formed by the two sticks and the line CD extend…

One of the questions on my homework assignment is to explain why when radioactively tagged acetyl CoA is injected into a mouse, it partially presents itself within the mouse's glycogen stores. Since acetyl CoA is not involved in glycogen synthesis at all (at least as far as I can see) how is this possible? Any help is GREATLY appreciated.

Hello, everyone! I am analyzing the molecule ethyl acrylate right now and having a little trouble because I've, unfourtunately, fallen behind in my organic chemistry course at the moment. I'm having a little trouble understanding this whole thing, so any help is appreaciated. Firstly, what sp3 chirality centres are there on the molecule? I don't really get this one, but is it the carbon double bonded to an oxygen an sp3 chiral carbon, with an R configuration? Are there any other chirality centres that I missed? Lastly, are any parts of the molecule conformationally mobile and what is the most stable conformation of ethyl acrylate? Unfourtunately, this par…

Hi, i thought id be able to do this without any difficulty but i got a bit confused with a couple.. Can anyone tell me if this is right? or do you think the secretory vesicle and lysosome are maybe the wrong wat round, and maybe the golgi body and SER are the wrong way round? here is the link to the image http://img14.imageshack.us/i/cellil.jpg/ Any help would be greatly appreciated! Thanks

lim f(x+h)-f(x) / h = -1 / (x-2)^2 h-> 0 -1 / (x-2)^2 = -1 I don't know what im doing help??

I have a few momentum based problems for basic physics that I'm drawing a complete blank on... 1. A fully dressed person is at rest in the middle of a pond on perfectly frictionless ice and must get to shore. How can this be accomplished? (it wants the answer in terms of conservation of momentum) 2. The previous problem answered in terms of Newtons 3rd law. and 3. A railroad diesel engine weighs four times as much as a freight car. If the diesel engine coasts at 5 km/h into a freight car that is initially at rest, how fast do the two coast after they couple together? I've gotten this far: mass of diesel engine = 4 x mass of freight car. Momentum of diesel engine …

I get that the energy from the electrons that as passed through the ETC pump protons across channel proteins which creates a proton gradient and it goes through the ATP synthase through diffusion which is constantly spinning. Where does the ATP come from. I think it's because im not sure what a proton gradient is which is preventing me from fully understanding. I also don't get how it's spinning affects it and where potential energy comes in... help?

I have to write a 2000 word essay due tom on this question. It is for a Uni foundation unit and the topic is completely unrelated to my study course (yes I do think that it is pointless). I have learned the basic of quantum physics but really do not want to have to get into detail. I have done the intro and am up to 1000 words. Can anyone point me in the right direction? Any ideas will help a lot as I will elaborate on them. Philosophical concepts are ok as well. The question: Why should all university students, and not just those studying physics, understand the ideas associated with quantum mechanics? Cheers Merged post follows: Consecutive posts mergedh…

Please help me guide my son and his thinking...I am not a math or science person... I hope it's okay if I type the questions and his way of answering it... Cindy made tea. She started with 300g of water at 20C. She transferred 18,000 calories to the water. What was the final temperature of the water. Well, first of all, my answer is....there aren't calories in water! But as I said before I know nothing. My son's work was....multiplying 300 into 18,000, which gave him 54 degrees. Is that right??? This is my first thread so if I didn't something wrong...sorry!!!! mom...

I did a lab on it using the equation: Co(H20)6^2+ + 4Cl- <=> CoCl4^2- + 6H2O pink^ blue^ When acetone was added to the H2O it consumed some H2O so i expected it to shift right to add more H2O and fix the equilibrium thus turning blue! but only half turned blue (top half, the bottom remained pink) Why? I really don't know where to start except to say acetone is less dense.

Hi, In chemisty lab ,in the expirament of Oxidiation-Reduction titrations| : determination of Oxalate. the equestion is : why is the KMnO4 solution filtred ?? and why should it not be stored in rubber-stoppered bottle ?? Joumana

Do tissues (eg: leg muscle, heart, uterus) take up more oestradiol than blood? Or is it the other way round?

For my science fair project, I am going to be constructing a wind tunnel that measures lift. I was wondering if anyone had any ideas for a good wind tunnel and/or a good power source? I thought maybe for the wind tunnel I could use a drainage pipe but I'm not sure. Furthermore, I think the conventional household fan will not be powerful enough- a leafblower maybe? THANKS!!

I have recently enrolled on a Swedish massage course and as one of my assignments I have a question regarding the epidermis: Outline the changes to the epidermis caused by chemicals, medications and the environment generally. I have tried searching the net and reference books provided but have not been successful in finding the answer and wondered if anyone out there knew. Many thanks in advance Scoobysue

The question gave me the temperature and pressure of water vapor. I need to figure out the distance (in nanometers) between each molecule of gas assuming it is an ideal gas. It gives me the diameter of a water molecule (in nanometers). I figured out the density of the water vapor in molecules/liter. Now I'm stuck. I think I could figure out how much space the total amount of molecules takes up in nm^3 in one liter, and also the total space of one liter in nm^3, but I'm not sure if that is relevant. I just don't know how to proceed, this is a brain buster. I know the the number of molecules and volume, so I know it's possible to calculate, but I don't know wh…

Hey guys, I missed class the other day and we have hw that are going to be in the exam we have this week. I'm confused and stumped and I can't find info online. There's a strong possibility I'm overcomplicating stuff because I'm stressing myself out, but.. well.. that's why I'm trying to get help here. Naturally, I'm not looking for the solution alone, but since I missed the class, I''m not entirely sure I know if I'm doing it right. Also, the professor doesn't go by the book, so it makes things a lot harder. So, here's the first question I'm in trouble with: Find the electric ([math]E_0[/math]) (in V/cm) and magnetic (B) (in gauss) fields for 10 mjoule pul…

I was told that for an allosteric enzyme regulation to work, the enzyme in account should contain at least 2 subunits, but I can't understand why this is necessary. I think enzyme regulation is different from competitive inhibition as the former just stabilize the T state shifting the equilibrium but not directly competing for active site as in the latter case. And I think enzyme regulation is also different from non-competitive inhibition as non-competitive inhibition directly bind and inhibit the R state while the former just stabilize the T state, so it is in an equilibrium, an increase in substrate concentration could shift back the equilibrium. But this is not the …

Alright so this isn't exactly a homework question, but a strange thing I encountered in my course book : using visible movement as the defining characteristic of life is not enough. Movements over very small scales will be invisible to the naked eye – movements of molecules, for example. Is this invisible molecular movement necessary for life? If we ask this question to professional biologists, they will say yes. In fact, viruses do not show any molecular movement in them (until they infect some cell), and that is partly why there is a controversy about whether they are truly alive or not. Why are molecular movements needed for life? We have seen in earlier cl…

POSTED THIS IN THE WRONG FORUM. SORRY. I'm a klutz. REPOST. I did a lab and my results showed some inconsistencies. My concentration of 100 units/ml of catalase in H2O2 gave me a slower rated than the 80units/ml. I performed many tests so I don't understand where it could have gone wrong. Any ideas. The 100 units/ml concentration was obtained using 20mls of yeast and the 80 was obtained using 12mls of yeast with 3ml of distilled water. Any hypotheses? Is it because there is sufficient enzymes in both and by shear chance of the substrate getting into an enzyme the 80units/ml had better results?

The p-nitrophenolate ion absorbs lights at 405nm. A solution that is 74um in the p-nitrophenolate ion was diluted 1 in 2 with water.Absorbance of resulting solution at 405nm was .650. Calculate molar extinction coefficient of the p-nitrophenolate ion at 405nm. Your meant to assume water has no absorbance at 405 nm. How do you use the beer lambert law to predict the absorbance at 405nm of a solution that is 11.0mM in the p-nitrophenolate ion, how do you show absorbance has no units?

Hey guys, I'm working on a fourier transform and got stuck in a stage where I think I'm supposed to complete the square .. but.. I don't manage to do it. Here's what I have: [math]\int \exp{(\frac{-\alpha t^2}{\triangle t^2})} \exp{(-i\omega t)}=\int \exp{-(\frac{\alpha t^2}{\triangle t^2}+i\omega t)}[/math] And so from this point I want to complete the square so I can continue to solve. Here's how I started: [math]\frac{\alpha}{\triangle t^2}\left( t^2 + \frac{i\omega \triangle t^2}{\alpha}t \right) = \frac{\alpha}{\triangle t^2}\left( t^2 + \frac{i\omega \triangle t^2}{\alpha}t + (\frac{i\omega \triangle t}{2\alpha})^2 - (\frac{i\omega \triangle t}{2…

You know how varying pH levels can affect the reaction rate of enzymes. Why is this from a molecular standpoint. Do they ions from the enzyme get attracted to the acidic/basic environments and leave the enzyme?