ender7x77

I was just wondering if anyone could confirm my anwsers for 2 questions. 1)Explain the fluorescence of the chlorophyll bands. Did the spinach leaf fluoresce? If not, why not? The spinach leaf fluoresced because a molecule’s electron reached an excited state, resulting from the absorption of a photon by a pigment, and when this electron returned to its ground state, the resultant accompanying loss of energy is given off as another photon, fluorescence. The graph of the relationship between absorbance and wavelength illustrate this in the drastic drop in absorbance. As the graph suggests, this only occurs once which is why we only saw the fluorescence appear once on the chromatography paper, and thus, demonstrates how the drop in absorbance is an indication of fluorescence. 2) Using the structures in your textbook and the structures for carotene, neoxanthin, violaxanthin, and lutetin explain the differences in Rf values obtained. The structures all differ in a functional group, and thus differ in properties. These differences in structures are enough to affect the ability of the pigments to move up and down the chromatographic strip, which collectively contributes to the differences in Rf values obtained. Any help at all would be greatly appreciated. I dont expect people to do both, but really any help is helpful, as this is something I'm not really certain at all about. Thanks!

Thanks for responding and sorry for taking so long to respond as I have been working on 3 other assignments due this week. Hopefully, you will get the chance to look over it sometime as I am quite dubious in my endeavours. I know that the math oriented question is wrong as it should be 0.00344 mol/L. Anyways, thanks again.

Well, I've been doing Gr.12 U Chemistry and have been finding it difficult most likely because I do not have any of the prerequistes for the class. Anyways, I was wondering if anyone could verify any of my anwsers as I have been struggling with it...Here it is if anyone is interested: In cases of severe diabetes, a patient’s tissues cannot break down glucose, and, instead, the body breaks down fat for its energy. The fats are broken down in the liver and muscles, producing several compounds called “ketone bodies,” one of which is acetone. a. The acetone produced in this process is carried in the blood and urine. Explain why acetone is soluble in these aqueous solutions. Acetone is soluble in these aqueous solutions because they are polar molecules; thus, "like likes like" principle applies. It is an important solvent as a result of it having smaller chains making it have a higher solubility. b. When fats are the main source of energy production, there is an overproduction of ketone bodies, leading to a condition called ketosis. A patient with untreated diabetes may have a blood concentration of acetone of 20 mg/ 100 mL. Convert this concentration to mol/L. 20mg x 1 g x 58.09 g/mol = 1.18 mol 100mL = 0.1L -------1000 mg Therefore a patient with untreated diabetes may have a blood concentration of acetone of 1.18mol/0.1L. c. Acetone is volatile and is exhaled with the breath. Suggest a reason why, like untreated diabetic patients, people who are severely starved or dieting may have a smell of acetone on their breath – a diagnostic symptom of ketosis. Those that are severely starved or dieting may have diagnostic symptoms of ketosis as they would virtually be undergoing similar process as those with diabetes. Ketone bodies are burnt in order to give us energy. If we are not eating properly a body will think that we have an insufficiency and overproduce ketone bodies in order to compensate; thus, with this overproduction comes excess ketones which contribute to the smelling of acetone on their breath. d. Other ketone bodies lower blood pH, causing a condition called acidosis, which can lead to coma and death. Research the symptoms and effects of ketosis and acidosis and how these conditions may be avoided. Acidosis: As stated it is a change in pH which is an increased acidity of blood plasma. Since changes in pH are felt very dramatically as 0.4 over could potentially kill someone, it is helpful to understand the ways to prevent its deadly dosage. Symptoms of Acidosis include drowsiness, nausea, vomiting, and obviously acetone smelling breath. Ketosis: Symptoms - Nausea, vomiting, breath odor, sweet-smelling fruity acetone breath (since acetone is a small chain ketone), breathing difficulty, rapid pulse, rapid breathing, abdominal pain (usually in children), drowsiness, confusion coma. ANY HELP at all would be very appreciated. thanks.

How would I determine that the force exerted by pushing off a wall would equal the force required to stop me ( i know it wouldn't exaclty equal but i figure it be close with there being no gravity). I'm trying to prove this in order to make-up a science fiction based game for the creativity component of the assigment. So, far I have determined that the velocity would obviously be constant and i have been trying to play around with magnitudes and impulses but I cannot figure out how I would calculate the force necessary to push myself off the wall. Anyways, any help would be very appreciated.

Hmmm... if there is no gravational potential energy then is it safe to assume that there would be no kinetic energy. Also, on account of there being no gravity is it safe to also assume that we would be weightless such seen in space. I understand that space has gravity but as a result of the gravational fields they somewhow produce weightlessness and constant free failing.

Thanks yourdad...is there anything I should consider? This is a big assignment and I cant think of things to do?

So, how would i make calculations to prove that?

thanks....do you have any suggestions?

Ya, I've come to know this but I think the task at hand is hypothetical. So, hypothetically what would people do to sustain life without gravity. What changes should be made? Sports? Walking? Flying? Its just to consider the possibilites without getting too technical... So, in no gravity am I able to pick up a truck or is there some sort of friction present. I know if I were to push it friction would be in play but to actually lift there would be no force holding it down.. What would happen to Force Normal?

Hmmm...the rotating habitat idea seems interesting only the math involved to demonstrate how this would balance everything seems too limiting in that this is a big assignment which i don't think would produce enough work to give me the mark I'm striving for. Also, I wouldn't really know how to show it. I know centripetal force is mv^2/r that is about it. Why would everything not be in slow motion? I'm basing my predictions off Astronauts so I have no idea why this happens. Side thought - does earth have gravity because the world is spinning? Gypsy Cake, I figured there be some medical problems associated with no gravity, which i'm hoping to overcome with spring systems. thanks. PS - it is a strange assingment! It is like turning back on everything you were taught.

So, I'm in Gr. 12 University Physics with no prerequistes and I'm finding some difficulty with an assignment relating to gravity. I need to do well in this class as I have been offered a scholarship but missing the Gr.11 U Physics has made doing well in this class extremely difficult. Anyways, the assignment requires that I consider a society where gravity does not exist. I have to figure out what would be the resultant and I need to know how I can compensate for it in order to sustain life. Here is what I got/questions: -I figure that without gravity there is a possibility of bones decalcifying as a result of there being no weight bearing exercises. So, I thought that setting up spring systems such as the bow flex could possibly defer it. Is there any way I can express this in terms of physics? - How would there be air resistance without gravity? If true, then if I jump I would never land as there is no opposing force; thus, Newtons First Law applies. - Is it true that everything would be slow motion? If so, why in terms of physics would that be? Would a bullet be slower? I don't think it would change the momentum because momentum is a result of mass and velocity; thus the bullet would produce the same injuires. If no, then would everything be like free falling? If jumped up and then push off on say a ceiling would the force required to land be too overwhelming, potentially life threatening. Anyways, I don't expect anyone to do calculations. All I am asking for is confirmation on some of my predictions and pointing in the right direction so i can make calculations. Thanks.

Ya, I figured that much just forgot to include it because class was about to begin. The problem is that i have to make calculations in order to make a scale, but I do not know how to approach doing it. Also, I took the class without any prerequisites so my understanding of things is a bit rough. thanks.

So, I have to create a question in relation to vector components and figured before I go to do the tedious work in which my teacher has asked of us (anwsering the question using a scale vector diagram, algebraic method, and component vectors), I thought I would ask if the question is capable of being anwsered. The requirements of the question involve it being non-co-linear, no right angles, and determining a change in acceleration.... So, this is what I produced: Othello went to an abandoned soccer pitch one evening to hit some golf balls. The soccer pitch is 300 yards in length with houses on its receiving end. Bob, unconcerned with the possibility of striking a house, hits a golf ball at an initial velocity of 148m/h [North] and an angle of 45 Degree’s, which inevitably hits a house, producing a velocity of 46m/h [East] after ricocheting of a house at an angle of 120 degrees. Determine the average acceleration of the golf ball over the interval, assuming that air resistance is negligible. Is this attemptable or incoherent? And if so, would it be very difficult to do the calculations?

Thanks for the quick response. My initial thought was that since the ball never loses energy that it will start at 10m/s, then as it hits the time axis will become 0m/s, and then as it is descending it will be -10m/s, raising back again to zero to the impact, and then upwards to 10m/s. Is this a right way to look at it or am I completely wrong to make such speculations?

A ball is thrown vertically upwards. It rises, falls back down, strikes the floor and bounces back up hwere it is caught at the same position of that it was originally released. Assume that no energy is lost when the ball hits the floor. If anyone can help the aforementioned is to be graphed, but by no means am I asking you to do it for me. The problem is that the graph has to have a scale. Now, I figure a velocity time graph would start above the time axis, to come in contact with the time axis, to go below the time axis, to return back to the time axis, and then would end above the time axis. I am also given the initial speed (10m/s), where it is released (2m above the ground), and the acceleration is assumed to be 10m/s^2 [down]. If anyone can point in the right direction in order to make a scale for this graph...it would be greatly appreciated. thanks.

Thanks bob... My teacher did it on the board for the class and you were right about it being an hydrolysis reaction. This is what it is KOH -(H2O)> K + OH The only thing i need is the net of it, which I cant see it changing. Thanks for your help.

Hmmm...well, I made some corrections. I stayed with the first one because it is the only thing that makes sense to me until I conference with my teacher, but if you look at the net of it, it seems somewhat correct (now, that I know how to do the net). Here is what I got for the two: Distilled water and Potassium Hydroxide Ionic Equation: H2O(l) + 2KOH(s) → 2H20(l) + K20(s) Full Ionic Equation: 2H+ + O2- + 2K+ + 2OH- → 2H20+ 2K+ + O2- Net Ionic Equation: 2H+ + 2OH- → 2H20 Thermochemical : H2O(l) + 2KOH(s) → 2H20 + K20+Heat,ΔH=(±)# Hydrochloric Acid and Potassium Hydroxide Ionic Equation: HCl(aq)+ KOH(aq) → H2O(l) + KCl(s) Full Ionic Equation: H+ + Cl- + K+ + OH- → H2O-(l) + K+ + Cl- Net Ionic Equation:H+(aq) + OH-(aq) → H2O-(l) Thermochemical: HCl(l) + KOH(s) → H2O + KCl + Heat, ΔH=(±)# I hope this is right...

Thanks for the help so far. I'm not trying to disagree with you, but there has to be some sort equation for it. Also, can you confirm whether or not my second attempt was correct. I'm not grasping this one, but perhaps I'll understand better on this one.

So, what am I to write then for the ionic equation?...I'm sensing that you are reluctant to tell me.

Can I not just flip this then? I apologize for my inanity, but the whole concept of this is evidently above me. Why can't KOH and H2O be my reactants? I specifically added the KOH to the H2O, which produced gas; thus supporting for what I know as a chemical properity.

So, if that is not the product then what is it when mixing distilled water and potassium hydroxide? And judging my your lack of a comment regarding the second equation, I am assuming it was correct.

So, I'm in grade 12 chemistry and I am not sure how to do chemical equations. This may seem strange to some, but it is due to not having any prerequisites in chemistry as I have decided I wanted to take it after discovering my affinity for science through Biology. With that said, I am at a great disadvantage and the course is looking very bleak at the moment. Anyways, I understand how to balance equations, but it is obtaining the equation that is difficult for me. Once, I am able to create one I should be able to do everything else. Anyways, here's what I got: Distilled water and Potassium Hydroxide Ionic Equation: H2O(l) + 2KOH(s) → 2H20 + K20 Full Ionic Equation: 2H+ + O2- + 2K+ + 2OH- → 2H+ + O2- + 2K+ + O2- Net Ionic: 2OH- → O2- Thermochemical: H2O(l) + 2KOH(s) → 2H20 + K20 +Heat, ΔH= (±) # Hydrochloric Acid and Potassium Hydroxide Ionic Equation: HCl(l) + KOH(s) → H2O + KCl Full Ionic Equation: H+ + Cl- + K+ + OH- → 2H+ + O2- + K+ + Cl- Net Ionic: OH- → O2- Thermochemical: HCl(l) + KOH(s) → H2O + KCl + Heat, ΔH= (±) # The first one I think is completely wrong, but I thought I'd post it anyways. If anyone could point out my mistakes I would greatly appreciate, and most likely learn from my errors. Thanks.

So, since I cannot seem to explain the setup of the question I thought I'd just show you it so you can visually interpret it. I do not expect you to graph it, but I'm hoping it gives you a better idea of what I'm trying to say.. Data Measured and Recorded Bu NASA (verify important law of phyiscs) _____________________________________________________________ | Mass (Kg) | 1..0 | 5.0 | 10.0 | 15.0 | | Force (N) | Distance (m) | | 9.800 | 6.380 x 10^6 | 1.427 x 10^7 | 2.017 x 10^7 | 2.417 x 10^7 | | 2.450 | 1.276 x 10^7 | 2.853 x 10^7 | 4.035 x 10^7 | 4.942 x 10^7 | | 1.089 | 1.914 x 10^7 | 4.279 x 10^7 | 6.053 x 10^7 | 7.413 x 10^7 | | 0.612 | 2.552 x 10^7 | 5.706 x 10^7 | 8.070 x 10^7 | 9.884 x 10^7 | Now, with this set of data I'm hoping you can visualize how each proportionality may come about. I did the first graph based on Force versus Distance when the mass was 1 kg, which eventually gave me: [math] F \propto \frac {1} {\Delta d^2} [/math] I then, to find my constant, I substituted points from my graph into my equation, which I found k to be 3.989 x 10^14. So... [math] F \propto \frac {3.989 X 10^{14}} {\Delta d^2} [/math] On my second graph I did Mass versus Distance, which generated: [math] M \propto \Delta d^2 [/math] Repeating the same steps as Force versus Distance graph, I found k and placed it into my equation: M = (2.455x10^{-14})xΔd^2. Eventaully, we are asked to combine the two proportionalities so that we create one statement that relates all the variables. The problem is when I'm doing this the different constances confuses me... I know I have to set both in terms of Δd, but I'm not sure after that. I think I got Δd = [k(m)/F]^(1/2). Anyways, that is all I know and I'm stuck.. I understand this a lot throw on you, but I'd really appreciate it. Thanks. PS- The problem is the relationship between the masss of an object, the distance from the centre of the earth and the force of gravity experienced by the object.

I stated the formulas I created for each different graph other than that there is no others because he just give us points and told us to graph...eventually, patterns emerged.

I must have the wrong theory then. We had to do graphs, which showed the proportionality. From one of these graphs which was relationg to Mass and Distance, I discovered that Mass was directly proportional to (Delta Distance)^2. I, then had to combine the two proportionalities that I had acquired and try to relate all variables.