Homework Help

Hi, I really don't understand this lab and I need help with it:( 1. Add 10 drops of 0.050mol/L hydrochloric acid to a 100 ml beaker. 2.Transfer a small amount of indicator to the acid sol'n by placing one drop of phenolphthalein sol'n on a watch glass. Touch the drop with the glass rod. 3.Place the beaker on the white sheet of paper. 4. Add the saturated sol'n of calcium hydroxide, drop by drop, to the hydrochloric acid sol'n until the sol'n turns a permanent pale pink. 5. Record the # of drops of CA(OH)2 added. 6. Conduct 3 trials so that an average can be taken. I) Determine the average # of drops of CA(OH)2 sol'n that you needed to neutrali…

Hi All, If I am trying to separate 2 products (dimethyl formamide and triethylamine) from a solvent in a distillation column, would the reaction be reducing or oxidising? Also how can this be any different from any other enviroment? Does it not have to be both oxidising and reducing? Thanks

I'm doing a heat project in school and your supposed to use household items to wrap around a water bottle and when the day comes my teacher is gonna put boil water and see if it can work and hes gonna time how long it can go. the items im using is some ultra cloth tin foil and a large Bristol board to put around it and im wondering if that will work and if i can get Styrofoam like which kind do i use the plastic cup one of the ones to keep something like a TV from breaking?

I'm doing research on Circadian Rythyms. I'm working on a theory that involves genetic manipulation. I don't know enough to ask the right question so please feel free to help me rephrase. Basically I'd like to know if you can affect genetic switches and turn them on and off over generations by, lets say, surgically altering the body. For example. Lets pretend that the earlobe produces testosterone, which of course it doesn't. But what if it did and lets say that a tribal group figured out that if they lopped off the earlobe members of the tribe exhibited different behavior. This might become a religious custom and over many generations I am interested in kn…

This exercise is from chapter 5 of A Book Of Abstract Algebra. I've been studying this book by reading, so this is not homework. Please help. Here is my attempt: If C' is a subgroup, [math](abx)^{2}=(xab)^{2}[/math] and [math](a^{-1}x)^{2}=(xa^{-1})^{2}[/math] for every [math]a[/math] and [math]b[/math] in [math]C'[/math]. It is obvious that [math]Z(G)[/math] is included in [math]C'[/math]. If we have a group [math]K=\{a,b \in K: a=a^{-1}, ab \neq ba \}[/math], then [math]Z(K)=\emptyset[/math] even though [math](ab)^{2}=(ba)^{2}[/math] for every element in [math]K[/math]. Thus [math]C'[/math] is not necessarily Abelian.

I have a very simple question: What is the efficiency of natural gas? Please help me; I need the answer for this for a school project. Thanks!

My professor offered us an extra credit question. He said it would be difficult and might not even be worth doing...any help with this question would be great! Here it is... Why does the cell synthesize dUTP in order to synthesize TTP when dUTP can be incorporated into and damage DNA? Here are some points to consider: 1. There is an alternate pathway in which dCDP is converted to dCMP then dUMP then TTP in which case dUTP could be avoided 2. Why isn't there a similar pathway for dUDP to dUMP to TTP? 3.Synthesis of dUTP may be needed by the cell. In what way? 4. What is the function of dUTPase and what does that provide beyond reducing the concentration o…

Limestone is a form of calcuim carbonate which is slightley soluble in water producing dissolved calcuim and bicarbonate ions, would you expect the water to be hard or soft?What would you expect to occur to the concentration of calcuim, magnesium and sodiaum ions in hard water when water is artificailly softened by passing through an ion- exchange filter? any help would be appreciated.

my question is located here link removed but no one will help me and i need an answer for tmr thank you

Hi I'm a little puzzled with the following scenario: Two parents 1 & 2 of genotypes (Aa) and (aa) are crossed to producedan F1. Sequencing and assembly is carried out on the genomic dna from two poolsof 1 & 2 progeny. Bioinformatic approaches will establish allelic variants uniquelyassociated with the dominant A allele. Earlier alignment of the parents sequenced genomic DNA to a reference sequence identified polymorphisms between A and a. What I don't understand is why in the scenario above is the identification of polymorphisms only in the dominant A allele. Why is it even necessary to cross to produce F1 progeny (we have already attem…

Hello, A Question says Assign a proper manufacturing process for nuts and bolts Can I say die forging then threading or die casting then threading How are they mass produced ? and is there tiny lathes to thread nuts ?

Hey guys, based on the picture above, the answer given by my teacher :- [math] 22 = \frac{285 + \frac{t-12}{2} * 30}{t} [/math] [math] 22t = 285 + 15t - 180 [/math] [math] 7t = 105 [/math] [math] t = 15 [/math] but for my answer:- [math] 22 = \frac{180 + \frac{t-9}{2} * 40}{t} [/math] [math] 22 = 180 + 20t - 180 [/math] [math] 2t = 0 [/math] ??!

Hello at this problem the car is moving around the circle with constant speed , and it is asking for d^2R/dt^2 for the radar And d^2(theta)/dt^2 for the radar at the instance the speed of car is vertical downwards as shown the speed equals 120 km/hour And the radius of the circle is 450 so I said a® = (d^2R/dt^2) - R (omega^2) but the only acceleration is the central which equals (v^2/ Radius) and in the same direction so we can get d^2R/dt^2 . and when I try to get the (alpha)(d^2 theta / d t^2) a (theta) = R*(alpha) + 2 (omega)* (dR/dt) and a(theta) equals zero and here …

24)What colors are reflected from a red and green sweater?What colors are absorbed? 25)An archerfish spits waterdrop's to knock down insects that are close to the water.Suppose the fish aimed in the direction in which it sees the insect.Explain why the waterdrop would miss the target. 26)Ellen owns a pair of polarizing sunglasses with round lenses.One lens popped out,and she put it back into place.What can she do to check whether or not the polarized lenses are lined up properly? 27)The bulb in a flashlight is placed in front of a curved,shiny surface.How does this produce a narrow beam of light.<br class="Apple-interchange-newline">

I am stuck at solving for the y-intercept of y= x+cosx. Can anyone show me how to solve for the y intercept? I figured out that cosx=-x for x+cosx=0, but I don't know how to compute the value of x such that cosx=-x.

I undertook a practical experiment where a back titration was used to determine the amount of nitrogen in fertiliser.My titres are 3.9, 3.7 and 4.2 So I know this reaction occurred: NH4+ + OH- ---> NH3 +H2O I then boiled the solution to expel the Ammonia which means the excess OH- ions were titrated against 0.1 M HCl. I think? NaOH- +HCl ---> NaCl +H2O Is this equation correct? If so are the following calculations correct too? n (HCl)= 0.1 x 0.0039 n(HCl)=0.0039 If this calculation is correct, what do I have to do next?

hello everybody I am writing a program in java that draws a square fractal recursively. The program starts by drawing a rectangle in the center of the window (1/4 of the window). Then I need to draw 4 smaller rectangles attached to the corners of the first rectangle. Then I need to draw 3 smaller rectangles attached to the corners to the corners of the previous rectangle and so on. Each one of the succeeding rectangles is half the width and height or the preceding rectangle. The output should be like the picture at the end of the post I am new to computer science so please help even with a pseudo code that can explain the steps and calculations to draw th…

Hello, Can I please know how to solve problems such as Question 4 here http://www.flickr.com/photos/76599498@N07/6877696868/ And Question 2 here http://www.flickr.com/photos/76599498@N07/6877697132/ I am at the first year at the faculty of Engineering , unfortunately I don't know a resource from which I can get answers .. Can any body tell me a free website or book on the internet for solved _simple_ examples on this subject ?? Thanks the height in question 4 is 100 mm

I have been given a graph to sketch. The original graph was: T= 20-4cos(pi(x-1)/12) I think I understand how to graph this , but later on they change it to this: T= 20-loge(x) 4cos(pi(x-1)/12) What type of graph is that? I don't even know if it exists, as I can't find anything in the textbook. I know it must follow the same shape as a log graph would because it asks you to do this after sketching the second graph: If the cycle starts at midnight Sunday, what day(s) will the temperature of the pool be more than 24.5 degrees celcius? (Just days not times) So could someone please tell me how to graph it? I have a "Texas Instruments Ti-nspire CAS" if that hel…

I was wondering if anyone knows how to solve/approach this problem. A group of people from my class have been working on it and we all come to different conclusions. Thanks in advance for your responses. An E. coli F- strain has the following genotype: S-U-R-I-E-C-. Three different Hfr strains, all carrying S+U+R+I+E+ and C+ markers and all having lambda phages integrated at the same specific site in their chromosomes are mated with the F strain in separate matings. The interrupted-mating results are given below. The numbers indicate time (in minutes) when different donor markers appeared in F- cells after conjugation began. Assume that the E. coli map con…

Hi, So basically there are 3 parts to this one question: 1a) Suppose an attacker tries to find out your password with an on-line attack by repeatedly trying to log onto your account with guessed passwords. Further suppose that the system logon is set up in such a way that no more than consecutive unsuccessful logon can be attempted within a period of 10 minutes (before the account would be temporarily disabled and the system administrator notified). Hence, an attacker can try at most 2 password guessing logon attempts every 10 minutes. Suppose your password consists of 6 (case sensitive) alphanumeric characters randomly chosen. How long it would take, on the…

Hey everyone- This is basically just a curiosity question. We ran a column and an SDS page for protein separation. We separated Ferratin, BSA, and Cyt C (they eluted in that order). Here is a pic of my annotated SDS page: (the last 4 wells on the right are unknowns, so that is why they are out of order) Also, the scale is arbitrary, 0=start, 100=finish Does anyone know what the wells marked (21) could be? They appear to be 180ish kDa according to the ladder. However, ferratin subunits are 20kda, BSA is 66kda, and cyt c is 12kda. Any ideas? They appeared to have eluted at the same time as BSA. Thanks!

OK guys, so I'm doing some work on a movie and please bare in mind it's fictional (hey,it's the movies!). But I need a character to smoke an oxygen cigarette(please don't ask why). Now, I'm talking about one of those metallic contraptions, I'm talking about something that actually looks like a real cigarette and unless you pulled it apart and examined it's "anatomy" you wouldn't know the difference. So I've come up with this idea that the cigarette is comprised of briquetted sodium chlorate and the cigarette paper is lined with thermal insulation. Would this theoretically work? If not, why? And do you have any suggestions on how to devise an oxygen cigarette that might no…

Could someone help me , how to simplify this expression not c xor (not b or c) Please help me

hello, im paul j. im studying cellular and molecular physiology (graduate degree). i chose my thesis about the anticancer effect of micromeria barbata. the study havent been done here in my area and theres a a local species of the same family called micromeria libanotica. im starting to pannic because i need references in order to finish my bibliography. i cant get access to recent articles related to my topic. all i ask if someone could just send me some articles. it will be the biggest help i could ever ask for and i cant be more thankful for any kind of assistance.