Homework Help

1. (bunch of filler info about barium sulfate). Given the following starting compounds, write for each compound a balanced total ionic equation and a balanced net ionic equation to prepare BaSO4: Ba(OH)2, BaCl2, BaCO3. If the the rxn occurs in more than one step then write the rxn as a series of sequential reactions. Identify the type of each reaction. For this one do I just add some sort of soluble sulfate compound that reacts with the starter compound to produce an insoluble precipitate? I'm guessing the first one is some sort of acid. Would you add H2SO4 and get (for the molecular equations, I know how to do ionic equations thats not the problem): Ba(OH)2…

Hey, have this question which i just cant wrap my head around, any help would be appreciated. Formic Acid (HCOOH) - pKa = 3.8 is a weak acid that partially dissociates to form its conjugate base (HCOO-) and releases protons into aqueous solutions. Whats the pH of a solution in which (HCOOH) = .7M and (HCOO-) = .15M? Then, if the pH of sol. of Formic acid has been titrated to a final pH of 2.8, Whats the ratio of conjugate base : Weak acid? And suppose your given stock solutions of formic acid and sodium salt of the conjugate base : (HCOOH) = 3.OM and (HCOONa) = 1.5M, How would you make a .1 M buffer(total formic acid + sodium formate concentration), 100mL tot…

a.ln(x)-ln(6-x)=3 b.log base 2 of (x+5)=log base 2 of (x-5)+log base 6 of (36)+6^(log base 6 of 3) a.ln(x) - ln(6-x) = 3 ln(x/(6-x)) = 3 x/(6-x) = e³ I've gotten this far for part a but now I can't solve for x. log[base 2] ((x+5)/(x-5)) = 2 + 3 (x+5)/(x-5) = 2^5 Part b I've gotten this far. It says not to give a decimal approximation for any of the problems rather a fraction or an exact expression. Can someone show me how to solve for x in these two problems? Thanks!

Hi everyone, I'm new to the forum and have this question on biochemistry related to a homework assignment that I can't wrap my brain around. So I'm told that a mixture containing the following two polypeptides were subjected to an isoelectric focus gel electrophoresis. Two bands were observed. I need to identify which band belonfs to each peptide, and briefly explain why. The polypeptides: Thr-Ala-Asn-Phe-Glu Pro-Gly-Thr-Cys-Met I have a diagram which shows a band at around pH of 5-7 and another at pH of 9-11. I know this procedure utilizes the isoelectric point of a protein, but so far in my study of biochemistry (1 month into the semester), I've encountere…

I'm trying to write a Matlab (well.. octave) code to plot the tradjectory of a satellite in orbit. Unfortunately it just keeps drawing a diagonal line, but I can't for the life of me work out why it wont do any type of "proper" orbit. I think it's nearly there as if I "drop" the satelite (no tangental velocity) it does a sort of 1D elipse. I've attatched the file anyway (renamed .m to .txt as uploader didn't like) if somebody could have a look I would be very appreciative. I'm using the following to work out trajectories (given in question); [Math] r(t + \delta t) = 2r(t) - r(t-\delta t) + \delta t^2 * F(t)/m...............and....... \\ \\ v =…

While studying for the Michigan Mathematics Prize Competition, I came across this problem on an older exam: The value of [math] \frac{1}{2!}+\frac{2}{3!}+\frac{3}{4!}+...+\frac{2006}{2007!} [/math] is A) [math]0.9999[/math] B) [math]1[/math] C) [math]\frac{2006}{2007}[/math] D) [math]1-\frac{1}{2007!}[/math] E) [math]\frac{1}{2007!}[/math] When I went to evaluate the series I did the following: [math] \frac{1}{2}+\frac{1}{3}+\frac{1}{8}....[/math] So I know it cannot be found using the summation for a geometric or arithmetic sequence. However I was easily able to eliminate answer E. I was however able to write the sequence in summation notation: [mat…

e^x+e^-x=3 i tried xlne+-xlne=ln3 x(1)+-x(1) = ln3 x-x = ln3 but that doesn't work btw the answer is +- 0.96

1) i don't get the law of reflection! 2) Don't get the normal 3) Refraction... what do you mean bending to/from the normal? 4) How do i write a summary note for this quote 'Energy travels in waves (carried by carriers?)' so srry about bad english I am so noob at science plz help P.s. please provide some examples NOTE: Im trying to type up a summary for myself to study

Hi all, I'm a beginning ME student and I have a project that requires me to heat a liquid (around 16 ounces) to around 120-140 degrees F. My idea is to place an electrically heated coil powered by a dynamo. My question is: what kind of voltage would i need to supply with my dynamo to achieve this kind of temperature? Also, I researched some kinds of resistive wires that I could use and most said to use the same kind of wire that is used in appliances like toasters. Is there a better way to go about this? THANKS!

Just wrote an essay on this topic just wondering what people thought? Only a rough copy but seeing of there may be any other ideas or evidence to suggest? -------------------------------------------------------------------------- Coherent Thought co·her·ent (kō hir′ənt, -her′-) adjective sticking together; having cohesion having coherence; logically connected; consistent; clearly articulated capable of logical, intelligible speech, thought, etc. Physics exhibiting coherence Many believe that what separates us from the rest of the animal kingdom is coherent thought, simply we got it and they ain’t! Yet without coherence in its basic form I fail to see…

For example 1 kg of water is heated from 5 degrees C to 100 degrees C to make steam. What's the total energy. I tried q = mc delta t and adding it with delta H = nH but I keep getting it wrong, can someone just show me how to do this one example so I can apply it to my questions.

my science teacher has asked us to come up with 4 common indicators and i havent got a clue, i know about red cabbage but what else??? plz help

How do you find this limit? I tried the sin x/x limit, L'Hopital Rule, Taylor Series, but it just kept giving me more sin x and x, so I couldn't get the limit. Can somebody give a clue?

For my bio class, we had to analyze a scientific article on an ant species in the Amazonian rain forest that poisons non-host plants. We were to follow a guideline in this mini book that we got, and the last question bothers me. To me, it is worded oddly. Maybe you could help? The main point(s) of view presented in this scientific article is (are)_____ Then under it it says, (The main question you are trying to answer here is: What is the author looking at, and how is s/he seeing it?) So, I took it quite literally, I guess, and responded the following:The main point of view presented in the scientific article is that the author is looking at a rather puzzling …

In a car engine, gasoline (represented by C8H18) does not burn completely, and some CO forms along with CO2 and H20. If 5.0% of the gasoline forms CO: A) What is the ratio of CO2 to CO molecules in the exhaust? B) What is the mass ratio of CO2 to CO? C) What percentage of the gasoline must form CO for the mass ratio of CO2 to CO to be exactly 1/1? I literally have no clue what to do with this problem. Can someone point me in the right direction? All I have is the unbalanced equation: C8H18+ O2 --> CO2+H20+CO

If anyone is able to help with these questions please let me know and able to explain how they got the answer as well!!! 3. Suppose you wish to rescan the image 8 by 10 in colour and you have two possible scanner settings; one to scan 8 bit colour and a second setting to scan 16 bit colour. 8 bit colour means that the image requires1 byte per pixel in each of the three colours of red, green, blue. 16 bit colour means that the image requires 2 bytes per pixel in each of the three colours of red, green, blue. 1. How many bytes are required to store the image in 8 bit and 16 bit colour respectively?. 2. If your USB flash memory key has 16 GB of storage space. How many …

I am trying to understand what how to use two's complement. If I have the number 128, I know that I can find the number by converting 128 to binary such as: 0000 0000 1000 0000 Then invert the digits like so: 1111 1111 0111 1111 Then add one to it like so: 1111 1111 1000 0000 which will give me -128 but what about if I want to find 2's complement of -128 would I still do it the same way as above which would give me the value of 128? I am new at this please help?

Q: What are the characteristics of a bacteria that is contagious?

For a warm up in my math class we were told to find the exact domain and exact range for the following function: [math]y=\frac{-1}{15\sqrt{36-x^{2}}}[/math] Find the domain of [math]\left(-6,6\right)[/math] easily. However the range was harder to find. I realized that the upper range is going to be: [math]\frac{-1}{15\sqrt{36-0^{2}}}=\frac{-1}{90}[/math]. It's the lowest value that I am struggling to find. I think it might be negative infinity because as x approaches 6 I will get -1 over 15 times the square root of a ridiculously small number, which will be a huge negative number. However I am not sure can anyone point me in the right direction.

I want to do a project based off of sciencebuddies.org/science-fair-projects/recommender_nav.php?GoTo=Genom_p003.shtml&isb=c2lkOjEsaWE6R2Vub20scDoyLHJpZDozMTYwNDEz&fave=no&from=TSW However, for science fair i need variables and graph. I want to compare if types of flu mutate at the same regions and make a pie chart of that. Here are the variables I have so far: Independent: type of flu Dependent: region of mutating protein Constant: type of BLAST program Is this correct? Thanks, ichigo6

Question: What are the gross # and net number of ATP in every one molecule of glucose?

Hi, does anyone know where to find nice study guides on the subject of macromolecules. I know I could Google, but I would prefer qualified webpages which I would need help finidng. Thanks!

Hello, I would like some assistance on how to use the NCBI website (ncbi.nlm.nih.gov) to identify an unknown sequence. I have a 1000 bp sequence & need to identify the gene it came from. Thanks.

Plese, I would like somebody who knows from immunology to answer for me the following questions with a T or F...Thank u. 1)Nucleated cells tend to be more resistant to complement-mediated lysis than red blood cells.(T) (F) 2)Enveloped viruses cannot be lysed by complement because their outer envelope is resistant to pore formation by the membrane attack complex.(T) (F) 3)C4-deficient individuals have difficulty eliminating immune complexes. (T) (F)

For example: 9y^2 - 6y - 9 - x = 0 What do you do in this case? Thanks!