Homework Help

In 1996, the Nobel Prize in Chemistry was awarded to scientists who discovered a molecule in the form of a soccer ball, called fullerene (C60). Besides this substance, graphite and diamond are also made of carbon. The densities of these substances, not necessarily in the order presented, are: 3,5; 1,7 and 2,3 g/cm³. Based on the average distances between carbon atoms, choose the appropriate density and calculate the mass, in grams, of a sphere of 2 cm diameter fullerene. Data: Mean distance between carbon atoms in nanometers (10^9 m) diamond ...................... 0,178 fullerene .................... 0,226 graphite ..................... 0,207 Sphere Volume V = (4πr³) / …

Hi all. Doing a project for work. I want to mix hydrogen gas (among other gases) in a closed loop system of mineral oil. If I buy a 1 cubic ft bottle of hydrogen, the ppm should be irrelevant because it's all hydrogen right (theoretically)? It would be 1 million ppm?? Finally, if I mix 1 cu. ft. (roughly 28.3L) of hydrogen with 5L of oil, how do I find the new ppm of hydrogen? Would it be: (1000000 *28.3 + 0* 5)/ 33.3? Or does mixing a gas and liquid require a different calculation for ppm? My goal is to get roughly 200-250 ppm in the mixture of 5L, so I don't think I need that much hydrogen.

I really can't think of anything to investigate. I prefer something that doesn't involve plants as a lot can go wrong with plants.

Hi, I need a help on the calculation for my dilution and after that the conversion into Log value. See below what I have done and pleased correct me if I'm wrong. I really appreciate your help. Formula: (sample size)+(diluent) = (total solution) then.. (sample size) / (total solution)= (original sample dilution) then one serial dilution of 1/10... (original sample dilution) x (diluent + 1ml concentration) = (Dilution Factor) then one serial dilution of 1/10 again... (Dilution Factor) x (diluent + 1ml concentration) = (Total Dilution Factor) For example: 11g + 99ml =110ml 11g / 110ml = 0.1 or 1:10 t…

Can you solve this problem's 2nd part? send me your solution if it's possible.

Are bezene, toulene etc. Are common names? If so, what are thier iupac names?

We have long wire with constant charge density that is put inside a grounded metal housing with a shape of cylindrical section (a ≤ r ≤ b and 0 ≤ ϕ ≤ α). We need to find potential inside the box. Relevant equations are: Δf=-(μ/ε0)*∂^2(r), where μ is linear charge density [As/m], ε0 is Vacuum permittivity, f is the potential (Δ is laplace operator) and ∂^2(r) is two-dimensional delta function. f (a ≤ r ≤ b and 0 ≤ ϕ ≤ α) = 0. Green's function for ΔG =∂^2(r-r0),two dimensions and no boundary conditions: G(r,r0)=(1/2*pi)*ln|r-r0| I am trying to solve the problem with green's function since it seems that solving this problem with separation of vari…

I am an undergrad student who is in a class a little outside of my wheelhouse - Public Safety RESEARCH and Technology. I'm a great writer and analyst. I'm not so good at research, I mean primary research. I'm trying to work up a hypothesis on the effects of climate change on emergency planning or emergency preparedness or emergency mitigation efforts. Or,hell, even how one of the latter three relates to the first. I really don't know. Once I have the hypothesis, I'll be able to do any necessary additional research, but I'm having a total mental meltdown and block trying to design a research question. I don't know if anyone can help with this or if this is too high of an a…

I am trying to solve this chemistry problem about a voltaic cell: the standard electromotive force of MnO4-, H3O+/ Mn2+ is 1.51V and the rest of the problem is in the picture. The problem asks to find the total electromotive force at 25 °C and to write the reactions occurring in the anode and in the cathode. I know I have to use Nernst equation but I can't figure out how to use the information given about the pH and the ionization constant of the compounds in the anode and in the cathode. Could you please give me a hint? Thanks in advance!

Plant A is supplied with : Nomal Carbon dioxide and Water, laballed with radioactive oxygen atoms Plant B is supplied with: Carbon dioxide,labelled with radioactive oxygen atoms and Normal Water Which photosynthetic product of Plant A will contain radioactivity and which photosynthetic product of Plant B Will contain Radioactivity? Predict with reasons.

I really need help on the articulation landmarks of the thoracic vertebrae. I feel pretty good about T2-T8. I'm a little unsure about T9 but mostly need help with T1, T11 & T12. Please help!

We are conducting an experiment in biology class, where we let Cannabidiol (CBD) react with Liver Enzymes (CYP2C19) (And NADH, which is needed as an energy source for the reaction). First we prepare different samples (with different concentrations of CBD and one without any CBD) and put them in a water bath incubator. We then measure the amount of NADH that has reacted via UV Spectroscopy at 340nm. Like that we determine how fast different concentrations of CBD have reacted (a small extinction = a fast reaction). Further should be noted, that the CBD was added in a solution of Ethanol and the Liver Enzymes were obtained by centrifuging cow liver 8so there is also Al…

Hi, I don't know what I am doing wrong. This is from a control systems textbook: Where am I mistaken?

Hello scientific enthusiasts! I have recently been studying the ultrastructure of the cell particularly with endoplasmic reticuli. I understand that this classification of organelles is divided into the soft and rough groups which have their respective functions of cell detoxification, lipid synthesis and so forth. But according to several comparison charts in biology books and online resource websites endoplasmic reticuli are stating as being rarely absent in eukaryotic cells. However, the part about them being rarely absent is not explained. Therefore, I would be much obliged if someone could explain to me under what circumstances these organelles are absent from eukary…

Can you explain me the image formation in case of a person with a lens of power above +4D?

For demonstration purposes, (to float things on) I am bringing two tubs of water to my presentation - one with the salinity of normal water, and one with that of the Dead Sea. From my understanding, since the dead sea is 34.2% salt, if I mixed 684g of salt with 2kg of distilled water, would that accurately represent the water in the Dead Sea?

Hello, kindly please answer this question ASAP. Q. Most important source for reducing equivalents for fatty acids synthesis in the liver is,A. GlycogenesisB. GlycolysisC. HMP shunt D. TCA cycle”

This is a Year 3-4 topic which I came across recently. Please refer to the attached diagram. I feel that there are two possible answers to this Question. Care to comment?

Hi everyone, I am in the process of doing my science fair and I have almost finished, when I stumbled upon a big question relating to my subject. I am doing an experimental project with the subject "How your immune system uses it's memory to fight the flu", majority of my information including the experiment coming from here; https://www.sciencebuddies.org/science-fair-projects/project-ideas/HumBio_p036/human-biology-health/immune-system-memory#procedure I have a question about the experiment, in short for the experiment we doing consists of putting some magnetic tape tied up with a plastic cover and put it in a jar filled with iron fillings and salt. (th…

Hello! I have a question and I have no idea of the answer. Could you help? A negative RNA enveloped virus, extremely pathogenic for humans, has recently been discovered. Its pathogenicity is caused by a total inhibition of the type I interferon response by two viral proteins: the capsid protein and the RNA dependent RNA polymerase. On the other hand, the adaptive response is quite competent. Which of the following vaccine strategies (attenuated viruses, DNA, recombinant proteins, viral pseudo particles, retro or lentiviral vectors) would be the most appropriate to protect the population against this virus and which would be as dangerous as the virus itself and w…

Hello, I would like to ask for a clarification regarding a passage of my anatomy textbook: I am currently studying the left ventricle of the heart and the mitral valve. The book is Gray's Anatomy but it is a translated version (I'm not from an English-speaking country), so I re-translated it back to English. My doubt is: what are the anterior and posterior coronary fascicles (fascicula)? Could you please explain that to me or link me a picture that shows them? "The mitral valve ring is stronger near the inner border of the fibrous trigones, from which the anterior and posterior coronary fascicles originate, partially surrounding the valve's orifice at the level of th…

When we add NaCl to water, it dissociates into sodium and chloride ions. Why the sodium cation not joined with the lone pair of electrons on oxygen, whereas in case of HCl, hydrogen joins with those lone pairs of electrons?

In the problem found at https://dmoj.ca/problem/ccc14s4 I heard from a friend that I am suppose to use a difference array to solve the problem but I can't seem to figure out how to solve this problem. Could anyone give me some advice? Please keep it simple since I am only a high school student preparing for the national infomatics Olympiad. A solution is python is found at http://mmhs.ca/ccc/2014/2014s4zihaozhang2.txt but I can't understand it. The problem: Canadian Computing Competition: 2014 Stage 1, Senior #4 You are laying N rectangular pieces of grey-tinted glass to make a stained glass window. Each piece of glass adds an integer value "tint-factor". W…

What is the difference b/w a simple concave or convex lens and a focal lens?

if we shift all double bonds of benzene to one side, what will be the effect on the its stability?