Homework Help

If we have 3-Heptanone and 2-Heptanone, what value would we get for 3-Heptanone? Also is the C=O group in the 2-Heptanone structure is replaced by the C=S group or the C=Se group. What dipol moment values would you expect for the resulting structure. I'm not sure how to answer this

Can someone please tell me why do aircrafts have pressurized cabins? Has it got something to do with the difference between the low atmospheric pressure outside the aircrafts (since they fly at very high altitudes) & the pressure inside the aircraft? Also if the same force is applied for the same time to a car & a loaded truck, which of the two will pick up greater speed & why? Thanks, Ron

So I'm stuck. I don't know what to do if I don't have the formula for the copper chloride... The table of information just makes it more confusing, because I don't know if i should average the values out or what...it all seems so ambiguous to me. Help please.

Im unsure what im supposed to do. Please dont just be blunt im actually lost here.. I need direction. 25. The following reaction represents the decompostion of water: 2 H2O ---> 2H2 + O2 How many molecules of hydrogen are produced from the decompostion of 12.2 g of water into its elements? (4 marks) 26. Determine the mass of carbon monoxide that is produced when 45.6 g of methane, CH4, react with 73.2g of oxygen gas, O2. The products are carbon monoxide, CO, and water vapour H2O. (7 marks)

sorry I put it on the wrong forum before if you have any two gases in different containers that are same size at the same pressure and temperature, what is true about the moles of each gas i got it how do I delete a topic anyway?

Alright so I did have all of the equations written quite nicely before but I clicked back and all that time spent typing the equation with the correct subscripts and all, but I realize I don't not really need all the information to understand this step. Basically I am doing a titration lab but I am having problem with dilution: It seems they want me to dilute it twice before titration, Solution X than use Solution X for Solution Y. Solution Y is what will be used for titration. Borax: 3.115x10-3 mol Dilute into a 100ml (0.1L) flask which will become known as Solution X: 3.115x10-2 M Borax Now this following part is where the confusion lyes, I don't know if it…

I just started intoductory astronomy and I have difficulty understanding this problem. Any help would be appreciated For a place at a latitude of 55 degrees, determine how high above the horizon the sun is at noon on 1) The Vernal Equinox 2) The summer solstice 3) Winter solstice

Determine the number of moles of N atoms in a sample of C_7 H_5 (NO_2)_3 that has the same number of O atoms as 13.4 g C_6H_12 O_6. My first attempt 13.4 g C_6H_12 O_6(1mol C_6H_12 O_6/180.15768g C_6H_12 O_6)(6 mol O/1 mol C)=0.4462757291 mol O... since the values are equal I figured that the N would be the same; wrong! (I know the masses of C_6H_12 O_6 are slightly different) After some time I came up with 13.4 g C_6H_12 O_6(1 mol C_6H_12 O_6/180.1566g)(6 mol O/ C_6H_12 O_6)(6.022*10^23 atm/1 mol O)(3 mol N/6.022*10^23 atm)=1.33|8839672~1.34mol N... That however did not give the right results... Relating the number of atoms seemed strange to me but it seemed…

Okay it gives the structure for alanine: ------CH3 H2N -- C -- COOH -------H Then it says: Give the systematic name for alanine. I don't know how to name amino acids, so can someone tell me how to? Thanks.

A conical pendulum consists of a bob of mass 0.3kg attached to a firm string of length 0.67m. The bob rotates in a circle of radius 0.36m, vertically below the point of suspension. Calculate: i) the linear speed of the bob ii) the period of rotation of the bob iii) the tension in the string Please help!!!

If the sidereal period of the moon was 29.0 days(I know usually its 27.32 days), what would be its synodic period? In doing this problem I have considered how far around the sun the Earth/Moon will have travelled in 29.0 days but then I am stuck Any Help would be appreciated

Hello my fellow scientists, I'm a chemistry freshamn student and my Physics Prof. told us that we had to cover the part of all classic physics with an essay... presonally I don't think that's a good idea, I dislike essays, I'd prefer to solve a bunch of problems rather than doing this, but ehhh. So yea, from the several things I have to research I have problems explaining what do classic physics study (explaining kinetics, dynamics and statics) I can´t find that in any book, they all start with newtons amazing laws . Ohhh and can anyone tell me what are fluid dynamics, molecular dynamics in proteins and energy analysis in physical-chemical systems?? I'd be really grateful…

I am not sure if I call the topic 'linear regression' is right, actually it is about 'least square analysis' in constructing a best-fit line, but when I googles the phase 'linear regression' some relevant information pops out. So assuming now we have a set of data, y values correspond to x values; plotting it in y vs. x manner it appears to form a straight line, but now we want the best-fit line. The method is to select an m value and a c value, by y = mx + c, to minimize di = sum[(actual y)-(computed y)]^2, I can do this step. What I got difficulty is to find the standard deviation of m and c. Sy^2 = di/(n-2); In a lecture I heard about: Sm^2 = (Sy^2)(n/D) …

Hi all, In one of my biochemistry courses, we went over the cdc (cell division cycle) mutant screen using conditional mutants (temperature sensitive). Yeast cells were exposed to ultraviolet light (to cause DNA mutations). Next, they were plated and incubated at 25 degrees, then replica plated and incubated at 37 degrees. The temperature sensitive clones were isolated and examined for cdc mutants. I am a little confused about the conditional mutants in general so my questions are... 1. What is the purpose of incorporating conditional mutants in an experiment? (I guess my question really is, how do they know the temperature sensitive clones contain cdc mutants…

Hi! I have a question about probablility. I don't know what the name of this type of statistics is, but here goes: John has three exams coming up, one in Math, one in Physics and one in Biology. He thinks his chances of passing are 0.8 for Math, 0.7 for Physics and 0.3 for Biology. His result on each exam is independent of the others. a) What is the probablility that he passes at least two of the exams? b ) Given that he has passed two of the exams, what is the probability that he has passed the exam in Math. I would love some help with this, either in the form of a direction to online pages that has examples of this kind of problems with solutions, or if y…

I received a text message from a friend who is a teacher in grade school and was not sure how to answer it other than to say I really can't do anything about it. Anyway, I thought I'd post it here and then link the thread to the person who sent me text message. Here it is. Any input would be appreciated. How do you interpret the theme "Kids of the new decades moving beyond science clubbing continuum"? Please provide example. What is a good slogan for this theme?

We are to find the annual growth rate of a fish from 2003-2007. The measurements are taken in March and September of the same year. This is throwing me off in determining the growth rate. In general if it just said the year and then the measurement (without the two different months), I'd subtract the first year measurement from the final year measurement and divide by 4. However, when two months are involved, this doesn't seem to work. This also leads me to believe that you need to account for 5 years instead of 4. Any advice on how to go about it? March 03 : 2cm Sept. 03: 4.5cm March 04: 4.7 Sept. 04: 6.6 March 05: 7.0 Sept 05: 9.2 March 06: 9.3 Sept…

Hi i need to know how I would plot this graph on a log-linear graph paper? (data is below) and how do i found out the gradient ? (Y=mx + c) :S Time (h) 0 24 48 72 96 120 144 168 192 Cell conc (cell/mL) 8.0 X 104 1.0 X 105 1.3 X 105 2.6 X 105 4.5 X 105 9.6 X 105 1.89 X 106 3.10 X 106 3.84 X 106 Thanks in advance

When I checked my edline and discovered that I had a 'D' in Trigonometry, I wasn't too flustered by the fact that I was doing poorly, but I was flustered most by the fact that I had no idea why I was pressing 'sin', or 'cos', or 'tan'... I know what they mean. I know their reciprocals. But, I don't know when to use them, and always have to look at previous problems, looking for patterns. I probably could memorize the patterns, but would that really be learning trigonometry? I still wouldn't know why I was pressing the function buttons. So, I decided to delve deep into the roots of the subject because History is a subject that I get A's in. I learned about Hipparchus, and …

So here is a question I am struggling with: "There is only one unique coordinate system in which vector components can be added. True or False?" I believe this is false, as I think you could create numerous different coordinate systems, and all you would have to do is make sure you watch what signs you assign to each vector. However, I am really not very comfortable with this.

I am using the equation for constant acceleration to find velocity. v^2=v(initial)^2+2a(x-x(initial)) Dropping a rock from 4 meters to the ground. Initial velocity is 0, a=9.8, and displacement is -4. So v^2=2(9.8)(-4), and it SHOULD equal=-8.85m/s (I know this is the correct answer, I already got it right on my homework). The velocity should be negative. But obviously my above answer is impossible because you can't take the square root of a negative. When using these constant acceleration equations I make the sign in the above equation negative if it is going upward, and positive if it is going downward. Do I apply the negative sign after I solve, to…

This reagent is able to convert aryl halide to Ar-MgX through formation of free radical of Ar., but I wonder why this could be done, as there should be resonance over seven atoms, but it becomes over six atoms after the reaction. I am not sure if the 3p orbital of Mg could participate in resonance. I also wonder if the Grignard reagent could be used for the same purpose with phenol or aniline, or those which more significant delocalization of pi electrons. Thanks very much.

So in my bio class we had our first lab as a microscopy lab. Since I am a transfer student, they want me to take freshman bio even though I got a 5 on AP exam which exempt me from freshman bio at my other institution. I state that because I went in all cocky to this lab since I have used microscopes many times before this in my other classes such as Invertebrate Zoology. In that we had a microscopy lab, but we never dealt with a stage micrometer for some odd reason. When this was foreign to me, I felt stressed and embarrassed for myself and the instructor (he was going nuts trying to explain things to people about it) . So, since I am new to it, I want to know if these ca…

Hello everyone! This isnt exactly homework but I wanted to try out the sum on my own so I felt right posting this here. In the figure in attachment there are three masses m1 , m2 , m3 all of which are unequal. Then what must be the relation between the masses to keep m3 stationary? (neglect friction and string and pulleys are massless) So my attempt was that for it to remain stationary (mass on both sides should be equal)m3 = m2 + m1. But thats not what the answer is. So can anyone give me a hint? sum.bmp

My routine practice is, after preparing the molten medium, I flame the neck of the bottle before removing the lid, then I pour the medium into plates with the plate-lid partially open, and I pour plates stack by stack. However, I am taking a lab course now, and the lab manual tells me to pour one plate each time, and open the lid completely while pouring in medium. In this case, one additional step comes in, that is, after pouring all the medium, the medium poured in the plate is flamed before letting them set. The tutor asked for two reasons to account for that. Because the lid is completely removed and plates are poured one by one, the whole process is performed rathe…