Friday
July 25, 2014

Posts by Trixie


Total # Posts: 130

finance
Chip’s Home Brew Whiskey management forecasts that if the firm sells each bottle of Snake-Bite for $20, then the demand for the product will be 15,000 bottles per year, whereas sales will be 91 percent as high if the price is raised 11 percent. Chip’s variable cost p...

finance
5.Capital Co. has a capital structure, based on current market values, that consists of 21 percent debt, 9 percent preferred stock, and 70 percent common stock. If the returns required by investors are 10 percent, 12 percent, and 17 percent for the debt, preferred stock, and c...

math
use substitution to solve this linear system: 8x + y = -458 -5x + 3y = 221

math
no idea . please help!

math
Model this situation w/ a linear system: Melissa borrowed $10, 000 for her university tuition. She borrowed part of the money at an annual interest rate of 2.4 % and the rest of the money at an annual rate of 4.5 %. Her total annual interest payment is $ 250.50 a.) a + b = 10 ...

math
Sales clerk at an appliance store have a chance of 2 payment: Plan A: $580 every 2 weeks plus 4.2 % commission on all sales Plan B: $880 every 2 weeks plus 1.2 % commission on all sales a) Write a linear system to model this situation b) Graph the linear system in part a c) Us...

math
will it work if i write : they have the same slope and are identical. Both have the slope of 2/5?

math
Explain what happens when you try to solve this linear equation using an elimination strategy. What does this tell you about the graphs of these equations? -8x + 20y = -40 24x - 60y = 120

math
Model this situation w/ a linear system: Melissa borrowed $10, 000 for her university tuition. She borrowed part of the money at an annual interest rate of 2.4 % and the rest of the money at an annual rate of 4.5 %. Her total annual interest payment is $ 250.50

math
please get back asap

math
is the answer 3x -2y -17= 0?

math
write an equation in general form for the line that passes through A(3,-4) and B(11, 8)

math
Create a linear system to model this situation. Then use substitution to solve the linear system to solve the problem. - Bobbie has been saving dimes & quarters to buy a new toy. She has a total of 28 dimes and quarters, with a value of $4.30. How many of each type of coin doe...

math
cashew nuts sell for $21.00/kg. Brazil nuts sell for $15.00/k. A distributor sold a total of 120 kg of nuts and Brazil nuts for $2244. What mass of each type of nut was sold?

algebra 2
How do you find the points of intersection, if any, of the equations: x^2 + y^2 = 5 x - y = 1

us history
how was president Woodrow Wilson truly a progressive president?

world history
i don't get the question because at the time in which they developed, the US didn't even exist.

world history
the question is: Why is England and France developing into nations important to us? i need websites where i can get information on this please

Chemistry
I figured out the first one...still struggling with the 2nd...

Chemistry
Q1. The blood volume in a cancer patient was measured by injecting 5.0 mL of Na2SO4(aq) labeled with 35S (t1/2 = 87.4 d). The activity of the sample was 300 µCi. After 22 min, 12.9 mL of blood was withdrawn from the man and the activity of that sample was found to be 0.7...

Chemistry
I also posted the above well before Dr. Bob had answered one of my other questions...

Chemistry
I wasn't talking about DrBob being rude...that would be bobpursely...DrBob has been nothing but helpful while I have used this site as a resource.

Chemistry
One last question...even though no one seems to be willing to help me out without being rude. The blood volume in a cancer patient was measured by injecting 5.0 mL of Na2SO4(aq) labeled with 35S (t1/2 = 87.4 d). The activity of the sample was 300 µCi. After 22 min, 12.9 ...

chemistry
Could you please just explain what I am doing wrong so that I can know how to approach these problems? I appreciate the advice and am well aware I need to go to bed...but I have to get these finished and my professor is out of town attending a memorial service and unable to an...

chemistry
Sleep is a bit of a luxury.....unfortunately I'm one of those students that doesn't have an option of taking a lighter load or working less....luckily I graduate in a few weeks. In the meantime I need to finish these problems so that I can go to bed....but they are due...

chemistry
Another attempt I made gave me relatively "reasonable" answers...but still doing something wrong. I converted the minutes to days and used that in the rate to find k via k= rate/N ; N being 3.25E18 atoms. this calculated k to be .00145. I plugged this into N'=Ne^...

chemistry
Oh and when I try to put this into my calculator I get 0... sorry if I am not catching on fast enough for some....I worked graveyard last night and Haven't slept in over 35 hours...

chemistry
A radioactive sample contains 3.25 1018 atoms of a nuclide that decays at a rate of 3.4 1013 disintegrations per 26 min. (a) What percentage of the nuclide will have decayed after 159 d? % (b) How many atoms of the nuclide will remain in the sample? atoms (c) What is the half-...

Chemistry
A sample of pure cobalt-60 has an activity of 8 µCi. (t1/2 cobalt-60 = 5.26 a) (a) How many atoms of cobalt-60 are present in the sample? atoms (b) What is the mass in grams of the sample? g The way I approached part a was to first convert the microCi into Bq (for a valu...

Chemistry
A certain Geiger counter is known to respond to only 1 of every 1000 radiation events from a sample. Calculate the activity of each radioactive source in curies, given the following data. 580 clicks in 104 s My text barely attempts to explain how to do this problem, and there ...

Chemistry
A certain Geiger counter is known to respond to only 1 of every 1000 radiation events from a sample. Calculate the activity of each radioactive source in curies, given the following data. My text barely attempts to explain how to do this problem, and there is no example. I am ...

Chemistry
no problem :)

Chemistry
Think of the equations you have learned and which variables you have been given. It helps to keep a list of them in front of you so you can quickly figure it out. Then just plug in. If you have P, V, mass, and T....you're going to use PV=nRT...just solve for P PV=nRT is an...

Chemistry
Nevermind...I realized that the problem I was using as an example called for 1 g of the reactant used....this didn't....so I have my correct answer now. Thanks! Still stumped on my earlier question though...

Chemistry
How much energy is emitted in each α decay of plutonium-234? (234Pu, 234.0433mu; 230U, 230.0339mu; 4He = 4.0026 mu). I tried finding the difference in mass first: (230.0339 + 4.0026) - (234.0433) = -.0068 mu I then converted from amu to kg by multiplying by 1.6605E-27. Th...

Chemistry
Hmm...I don't know. My webassign is telling me it's not a neutron. Thanks

Chemistry
Oh i just realized how you typed the equation has the product flipped. so it's 1,1,H + 1,1P --> 2,1H + ? order is A,Z,X where A is mass and X is the particle or element

Chemistry
neutron was my first answer...i am using +1 e^0 to be a positron though, not electron.

Chemistry
I know they need to balance out on both sides. I am just confused because I am pretty sure it should be 0,+1, e ...e being X. Webassign is telling me this is wrong but if that's true I don't understand why and need that explained....

Chemistry
for A, Z, and X I'm typing it in the form A,Z,X (or X as a particle) since I obviously can't do sub or superscript... 1,1,H + 1,1,p --> 2.1,H + ? I thought initially the missing particle at the end would be either 0,-1,e or 0,1,e (beta emission/decay) but apparently...

Chemistry
How can you tell if [ MnCl6]4- or [ Mn(CN)6 ] 4- has the longer wavelength of light? and then how do you figure out how many unpaired electrons each has?

Chemistry
Is Zn+2 diamagnetic or paramagnetic? I am a little confused on how to figure this out and I'm finding inconsistent answers when I tried to look this up. Thanks!

Chemistry
How can you tell if [ MnCl6]4- or [ Mn(CN)6 ] 4- has the longer wavelength of light? and then how do you figure out how many unpaired electrons each has?

Chemistry
Trying to name this compound and figure out its oxidation state [ CoBr2(NH3)3(H2O) ]+ I came up with triammineaquadibromocobalt(II) ion with a +3 oxidation state...but not sure if this is right... similarily for [Fe(ox)(Cl)4]3- I came up with tetrachlorooxalatoferrate(IV) ion ...

Chemistry
Which one of the following combinations of reagents will result in a spontaneous reaction? A) Al(s) + CuCl2(aq) B) Al(s) + CaCl2(aq) C) Zn(s) + CaCl2(aq) D) Cu(s) + ZnCl2(aq) I know the answer is A, but what I don't know is why, or how to figure this out. Thanks!

Chemistry
You know it's second order so your rate=k[NO2]^2 All you do is like you said, find moles, use that to find molarity (convert mL to L) and then plug the concentration into the equation. You're given the k. Same thing with part B, just changing the concentration :)

Chemistry
All you have to do is find the concentration of OH- and solve for pH (pOH= -log [OH-] nad then 14-pOH=ph [OH-} = Ksp/[M+}

Chemistry
NVM i was using the pKA instead of pH....i had it right afterall...guess it's jsut time for bed....

Chemistry
I figured out the correct new pH for each respective part, but apparently the initial pH i found for the buffer solution is incorrect. I just need help in figuring that so I can calculate the change. I initially thought the buffer pH was 7.38. Thanks!

Chemistry
for part a I tried using the HH equation, found moles of NaOH and used that for [base] and moles Na2HPO4 as [acid]...i used pKa 7.21...that was incorrect. For part b I used a similar method...plugging in HNO3 as the [acid] and Na2HPO4 moles as [base] the other pka values for H...

Chemistry
A buffer solution of volume 100.0 mL is 0.150 M Na2HPO4(aq) and 0.100 M KH2PO4(aq). Refer to table 1. (a) What are the pH and the pH change resulting from the addition of 80.0 mL of 0.0500 M NaOH(aq) to the buffer solution? pH pH change (include negative sign if appropriate) (...

Chemistry
I'm confused how I would use the Ka equation in the HH equation??? I thought HH was just pH=pka + log([base]/[acid]) ...

Chemistry
Calculate the pH of the solution that results from mixing the following reagents. Refer to table 1. mix 0.189 L of 0.019 M (CH3)2NH(aq) with 0.327 L of 0.011 M (CH3)2NH2Cl(aq) I tried using the Henderson-Hasselbach equation by finding the pKa but it didn't work....I am sti...

Chemistry
Nevermind I got it...I just mixed up my variables a little. thanks!

Chemistry
I am pretty stuck...not sure if I used the Henderson-Hasselbach the right way and I'm a little confused on how to set up the Ka expression...

Chemistry
I am trying to use pH=pKa + log(acid/base) to see where that gets me...I'm attempting to find the [base] using the given pH and pKa of 8.69 (for HBrO)...then use the concentration to find the new pH...

Chemistry
The pH of 0.50 M HBrO(aq) is 4.50. Calculate the change in pH when 6.50 g of sodium hypobromite is added to 110. mL of the solution. Ignore any change in volume. Ka of HBrO is 2E-9 I found the amount of moles used for each (.0547 mol NaBrO, and .055 mol HBrO soln) I'm not ...

Chemistry
1x10-2 mol of MgSO4 (Ksp = 9) is added to 1 L of water. Will 1x10-5 mol of CaSO4 (Ksp = 10-6) completely dissolve in the solution? I think the answer is yes...because the Q will be less than Ksp of 10^-6?? Which of the following salts would you expect to result in the greatest...

Chemistry (or Physio/Biochem)
Asthma affects about seven percent of the population. During an asthma attack smooth muscle cells in the bronchi constrict, the airways become inflamed and swollen, and breathing becomes difficult. What effect might an asthma attack have on blood pH? A. pH goes down B. pH goes...

Chemistry
100 mL of each of the following solutions is mixed; which one of the mixed solutions is a buffer? A) 1.0 M NH3(aq) + 0.6 M KOH(aq) B) 1.0 M NH4Cl(aq) + 1.0 M KOH(aq) C) 1.0 M NH3(aq) + 0.4 M HCl(aq) D) 1.0 M NH4Cl(aq) + 0.4 M HCl(aq) E) 1.0 M NH3(aq) + 1.0 M HCl(aq) I am unsur...

Chemistry
Which of the following systems could act as a buffer? A. HCl/Cl- B. NaOH/OH- C. HSO4-/SO4-2 D. H3O+/OH- E. All of the above my guess is C because A and B are too strong, but I am unsure of D. Can someone explain how to think thru this?

Chemistry
Given the equilibrium rxn CF4(g) + 2H2O(l) ⇔ CO2(g) + 4HF(g) ΔH < 0 if pressure is increased by adding argon gas to the equilibrium, I know it doesn't decrease the amount of HF. But if a random gas is added for any equilibrium rxn, will it always cause an inc...

Chemistry
If a weak acid is say only 5% ionized at equilibrium, then the ionization rxn would be reactant favored, correct? I am a little on the fence about understanding this if anyone could better explain why this would be? I am assuming because it is not completely ionized, the amoun...

Chemistry
I see how there are the numbers of particles in solution, I am a little confused on how that relates to these properties. My text is pretty brief over this section.

Chemistry
I am confused about why this is the answer to a practice problem I was given. (answer is c). Could someone explain why/why not for each answer? 2) Solution A is made from 1 L of water and 0.1 moles of Na(CH3COO), and Solution B is made from 1 L of water and 0.1 moles of Na2(SO...

world history ancient greece
i need to do an outline of how to organize things for my research report on the Ancient Olympics. How cna i divide up my report?

Chemistry
Right...I am confused on the solving for x part. Before when I have used this I have always been given ka or kb in order to solve for x. This time I'm not--so I don't know how to set up my equation to find x. Once I have x I know how to do everything else

Chemistry
Calculate the initial molarity of KNH2 and the molarities of K+, NH3, OH-, and H3O+ in an aqueous solution that contains 0.75 g of KNH2 in 0.255 L of solution. You may ignore the reaction of NH3 with water. I already found the initial molarity, but I am not sure how to find ea...

Chemistry
Calculate the initial molarity of KNH2 and the molarities of K+, NH3, OH-, and H3O+ in an aqueous solution that contains 0.75 g of KNH2 in 0.255 L of solution. You may ignore the reaction of NH3 with water. I already found the initial molarity, but I am not sure how to find ea...

Chemistry
Well I'm not actually making it in a lab...I just don't fully understand the concept of this

Chemistry
In a .1M aq. soln of NaCN, how would you determine the major species (other than water)? And how would you determine the pH (not exact pH, I just want to know how to know if it is acidic ie. <7, etc). Thanks in advance

Physical Chemistry
I figured out what I was doing...I ended up using the Van't Hoff Equation and the enthalpies of formation to solve for K at 100 C. This stuff is so time consuming...

Physical Chemistry
Calculate the equilibrium constant at 25°C and at 100.°C for each of the following reactions, using data available in Appendix 2A. Remember that the organic molecules are in a separate section behind the organic molecules in Appendix 2A. (a) HgO(s) Hg(l) + O2(g) at 25&...

Chemistry Question!!
When 1.00 g of gaseous I2 is heated to 1000. K in a 1.00 L sealed container, the resulting equilibrium mixture contains 0.830 g of I2. Calculate Kc for the dissociation equilibrium below. I2 <--> 2 I What I did was converted the initial I2 into moles then molarity since...

Physical Chemistry
When 1.00 g of gaseous I2 is heated to 1000. K in a 1.00 L sealed container, the resulting equilibrium mixture contains 0.830 g of I2. Calculate Kc for the dissociation equilibrium below. I2 <--> 2 I What I did was converted the initial I2 into moles then molarity since ...

Science
I've heard this one before: "A meteor is a flash of light made by a falling meteorite"

Chemistry
nevermind--after 50 hours of pulling my hair out I finally arrived at the answer :)

Chemistry
And when solving for molality do I need to use the formula dT=Kf*molality? Or do I find it independently of this equation?

Chemistry
I am confused by the 1% by mass part...I don't understand what it really even means or if I am multiplying something by 1% or what? I did eventually realize I had to multiply by 3--I have never seen a problem like that before so I was slow to catch on. Thanks for your help

Chemistry
A 1.00% by mass MgSO4(aq) solution has a freezing point of -0.192°C. Water has a kf of 1.86 (K·kg)/mol. (a) Estimate the van't Hoff i factor from the data. (b) Determine the total molality of all solute species. I can probably figure out the second part of the q...

Chemistry
I still need help with this problem... Calculate the concentration of the solution the molality of hydroxide ions in a solution prepared from 9.16 g of barium hydroxide dissolved in 179 g of water I do not know how to approach this...I keep doing something wrong.

Physical Chemistry
the answer for a was actually incorrect

Physical Chemistry
Got it. for A i was using molar mass for FeCl3 instead of water..oops. I solved C...but I am still confused with the second question of anyone can help me out... Thanks!

Physical Chemistry
Calculate the concentrations of each of the following solutions. (a) the molality of chloride ions in an aqueous solution of iron(III) chloride for which xFeCl3 is 0.0195 (b) the molality of hydroxide ions in a solution prepared from 9.16 g of barium hydroxide dissolved in 179...

Physical Chemistry
Just want to double check...so for KCl, because it is endothermic, my q should then be negative?

Physical Chemistry
Ok, thanks for your help

Physical Chemistry
no I didn't get that, but I was adding both 18g of the salt and 190 g of water for the m used in the equation. I'm still a little confused with the signs...I thought if it is releasing heat then q would be negative? I did manage to get the same value for q I just had i...

Physical Chemistry
Determine the temperature change when 18.0 g of the following salt is dissolved in 190. g of water. The specific heat capacity of water is 4.184 J·K-1g-1. The enthalpies of solution in the table are applicable. Do not take the added mass of the salt into account when ca...

Math
I mean x is greater than or equal to, not less than. sorry.

Math
Solve the inequality: 2x-1 / 3x-2 < 1 [the < is actually less than or equal to] I got one of the answers, x is less than or equal to 1, but there's another. How do you find that answer? Thanks

american lit. [[10th grade]]
i need to write an essay about how holden caulfield from the catcher in the rye is fascinated with childhood and innocence. what can i include as examples for that?

english/ literature/ essay
oh thank you very much! :)

english/ literature/ essay
any other reasons? i had that reason well something like it...

english/ literature/ essay
hi i need help with this.. what is the importance of recognizing cultural differences as a young person in today's global society?

algebra review!
it says write the equation of the vertical line that passes through the point (7,-3). what do i need to start it off? find the equation for the line with undefined slope and passing through the point (-1,-2). what do i need to start that off? what equation do i use to find the...

algebra review
find the y-intercept of a line that passes through (2,1) and has a slope of -5. i forgot what equation i have to use to find this out. can someone give me which equation i have to use? or all the equations that deal with slopes please

science- bio
how can traits on a particular chromosome be determined? how can these traits determine the characteristics of an organism? what could happen if a base is out of order?

not sure wat subject
i need two examples of situations where you would think help/charity should be given but it didnt happen as you thought

history/science
hi. i would like to know if someone can send me websites other than wikipedia that might be able to help me find out stories of how the earth and the things on earth were made...

Reading
oh ok...thank you very much

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