Homework Help

Suppose now we have two acids A. 10 cm3 of 1M sulphuric acid B. 10 cm3 of 1M hydrochloric acid I just want to ask how should I calculate in order to know which acid has a higher concentration of H+

I was just wondering if anyone knows the formula to convert an absorbence reading from a spectrometer reading to the amount of protein in micrograms.

Hi Does anyone know why finding the sizes and locations of restriction enzyme sites is useful? And also why finding the sequence of an intron would be useful? Or else a really good, clear site with the information would be awsome. Thanks!

Hey everyone, I am in Chemistry 11 and we've just started learning about ion concentration and titration. I'm not sure if I did this correctly but I need help with this one question: "What is the concentration of each ion in the solution formed when 94.5 g of nickel (III) sulphate is dissolved into 850.0 mL of water?" For the equation I came up with: Ni2(SO4)3 + 6H20 → 2Ni + 6OH + 6H + 3SO4 Is this this correct? Then I assume you take 94.5/.85L to get the molar concentration and you use the concentration and use stoichiometry to find the concentration for each of the ions? Thank you in advance!

We cannot pass beyond body to a further kind, as we passed from length to surface, and from surface to body. For if we could, it would cease to be true that body is complete magnitude. We could pass beyond it only in virtue of a defect in it and that which is complete cannot be defective, since it extends in every direction. Now bodies which are classed as parts of the whole are each complete according to our formula, since each possesses every dimension. But each is determined relatively to that part which is next to it by contact, for which reason each of them is in a sense many bodies. But the whole of which they are parts must necessarily be complete, and mus…

1) Let u and v be nonzero vectors in a vector space V. show that u and v are linearly dependent if and only if there is a scalar k such that v = ku. Equivalently, u and v are linearly independent if and only if neither vector is a multiple of the other. 2) Let S = {v1, v2, ..., vk} be a set of vectors in a vector space V. Prove that S is linearly dependent if and only if one of the vectors in S is a linear combination of all the other vectors in S. For these two questions, I know I have to prove them in both directions because of "if and only of". However, how to approach this problem? what Thms or definition should I use to prove them? 3) Let S = {v1, v2, ...…

Let T be the set of all matrics of the form AB - BA, where A and B are nxn matrics. Show that span T is not Mnn. 1) does "span T is not Mnn" mean that Mnn does not span T? Thanks

Hi, I need some help on this type of question. How would I calculate this ? If the absorbance at 540 nm of a sample of blood diluted 201 times in Drabkin's solution is 0.511 and that of a 0.572 g/L haemoglobin in Drabkin's solution is 0.325, what is the haemoglobin concentration of the blood sample in g/L? (the answer should be to one decimal place) I tried to work this out twice using the hb concentration formula which is absorbance of test*concentration of ref. prep. *dilution of blood/absorbance of ref. prep. but the answers I got was incorrect, and I cant tell where i am going wrong so can someone please have a look at this. Thanks

Can anyone point me to where I can find what role adenine plays in coenzymes like nicotinamide adenine dinucleotide (NAD) and flavin adenine dinucleotide (FAD)??

i am supposed to find the roots of quadratic equations but they never showed how to do it without a graphing calculator and i can't figure out how to get any of the online ones to tell me the vertex or the roots.

Hi everyone, This is about Mean cell volume of blood. So basically, to calculate MCV of blood you need to divide haematocrit with red cell count, then the answer I get would be in litres. Now I need to convert Litres to fL (femtolitres) i know that there are 10^15 fL in 1 Litre, so how would I work this out? I have problem with the 10^15 part, thats what is confusing me. Similarly how would I convert grams to pg (pictogrammes) ? there are 10^12 pg in 1 g. I have tried looking on the internet but there are only converting calculators and no explanation whatsoever. please someone help out

now i'm using apostol calculus book user, the problem says that given n*n matrix A with real entries such that A^2=-I I=UNIT MATRIX THEN PROVE THAT det A = 1 i know that (det A)^2=1 so, det A = +1 or -1 but i cannot prove that why -1 is not how can we prove this thing without using cayley-hamiltion Th. ;because it's proof is either complicated i think this problem may not using cayley hamiltion Th. please solve this problem~

Determine whether the given vector A in 2x2 matrix belongs to span{A1, A2, A3}, where A1 = [1 -1 0 3] A2 = [1 1 0 2] A3 = [2 2 -1 1] A = [5 1 -1 9]. Since A1, A2, A3 are not a nx1 matrices, I cannot put this into reduced echelon form? Therefore, what can I do to solve this problem? …

Hi, I've been looking at material all day and am still confused about multiple testing. For the assignment, we're given a paper where three groups (2 experimental, 1 control), are put on controlled diets, have have biomarkers and memory assessed after 3 months. The question is why it was appropriate for the authors to no correct for multiple testing. They performed post-hoc t-tests for differences before and after the intervention. Most of the documents I've been able to find say that multiple testing correction is used when you're comparing a massive number of metrics and need to make your significance more stringent to keep out false positive results, but those a…

Hello! Im in 9nth grade and my school is very very strict to science faris. They want us to like create things that will help the future or like that, and they don't realize it's very very tough. So what im asking for is a viable theme (not reserch, you have to take action in the process) except for cosmetgic and things like that, because they can give allergies. Examples our professor gave us was to: invent a new soda, or to cover a super new and cool thing like molecular cooking (we can't use that one, already taken) Please help me! Im in a hurry and please dont say like pollution or volcanos and stuff. Sorry for the english, not american Thank you Dani.

Hi to all =] I have been trying to solve the following problem: For propanoic acid: delta T = delta (melting temperature) = 0.0193 K m = molality = 0.01 mol/kg Kk = cryoscopic constant = 1.86 K kg / mol density = 1.00 g/ml I need to calculate the dissociation constant. (the correct answer is 1.42 * 10^-5 mol/l) [form: Izbrana poglavja iz biokemije 1; A. Bavec et al.] ----- So the way i tried to solve it is write this equation: CH3-CH2-COOH <-> CH3-CH2-COO^- + H^+ I also know this equation: delta T = Kk * m or: delta T = Kk * m * i > where i is the van't Hoff f…

2. Steam enters the turbine as 100% saturated vapour at pressure of 6 MPa, and saturated liquid enters the pump at a pressure of 0.01 MPa. The net power output of the cycle is 50 MW. Determine (i) The thermal efficiency (ii) The mass flow rate of the system (iii) The rate of heat transfer into the boiler (iv) The mass flow rate of the cooling water from the condenser (in kg/s) The cooling water enters at 20 °C and exits at 40 °C. Please any one help me in this problem...how can i get workdone from power... because every time i get workdone from enthalpy its unit would be KJ/KG.. so how can i get transfer to the workdone..???

I have a science project due for a physical science class. We have to take a household item and break 10 ingredients in the item down to their molecular level. We get extra points if we don't have to enlist the professor for help. I'm seeking clarification on the terminology of breaking down an ingredient to its molecular level. I'll use sodium silicate as an example. Would breaking sodium silicate down to its molecular level look like: Na2Si03 If not, could someone help me with breaking down sodium silicate to its molecular level so I can have a place to start?

For our assignment, we have to design a system that will draw water from a source, calculate it's quality, treat it and then distribute it. I'm not really sure where to start or what to do and would really appreciate guidance on what to do.

Hi to all. I'm trying to solve this genetic problem but there no is way I can do it, so I hope anyone can help me (sorry for my bad English): "We expose 109 yeast cells (in exponential growing) to a 10 minutes pulse of nucleotides labeled with phosphorus-32 in the alpha phosphate, with an specific activity of 80 Ci/mol (ci = curium = 2,22x1012 dpm). After the pulse, we purify all the DNA, which has become radiactive with an activity of 55000 dpm. Using this information, calculate the DNA synthesis rate of each yeast cells in nucleotides / second" Thanks you!

I have the stats on a well in a rural area and need to devise a way to make the fluoride level safe to drink. Assume I had to treat 1000 L per day and I wanted to get the fluoride concentration down to 1-2mg/L, how would I do that or show some calculations? the details of the well im focusing on are: pH=7.9 TDS= 975 [F-]= 13.1 mg/L [CO3^2-]= 3.0 mg/L [Ca2+]= 5 mg/L I know I need to precipitate it but im not sure how to show calculations for it or what to use. Any help would be amazing.

Hi, I need to plot a graph with mean absorbance values against concentrations. Basically there would be 4 mean absorbance values on the y-axis and concentrations would be on x-axis. And then I need to use this information to determine the concentration of my protein (RFP) in unknown sample. I wanted to do this on excel but i dont know how to do this bit, and also on paper. Does anyone know how to do this ? Thanks

Hi I'm having trouble with this proof. I'm not sure if I did the first part right and how I should use the second part properly. I am following the hint in the book to use the Axiom of Replacement to prove step three below and follow through with Replacement and Union to finalize the proof. 1) Prove that the Cartesian Product of two sets is a set [math] A \times B = \left \{ \left \langle u, v \right \rangle \mid u \in A \land v \in B \right \} [/math] 2) Taking the Axiom of Replacement [math] \forall u \forall v \forall w \left ( \psi \left ( u, v \right ) \land \psi \left ( u, w \right ) \rightarrow v = w \right ) \rightarrow \forall z \exists y \f…

Ok, so I'm a bit stuck. Here's the problem: log(base9)(x-6) + log(base9)(x+2) = 1 Here's my work. At first i simply tried to solve by rooting: (x-6)(x+2) = 0 x = 6 or x = -2 But realized this would not work, as any rooting would result in having one of the logarithms above yield an invalid result (eg. log_9(0) ) I've tried another way (isolating x), but I'm stuck. (x-6)(x+2) = 0 x^2 + 2x - 6x - 12 = 0 x^2 -4x = 12 The only thing I can think of doing at this point is x - 2(x^(0.5)) = 12^(0.5) And that's kind of useless (i think). Any ideas?

1) Let x0 be a fixed vector in a vector space V. Show that the set W consisting of all scalar multiples cx0 of x0 is a subspace of V. What techniques should I use to prove this? 2a) Show that a line lo through the origin of R^n is a subspace of R^n. 2b) show that a line l in R^n not passing through the origin is not a subspace of R^n. What techniques and direction should I use to solve these problems? Thanks