Wednesday
October 1, 2014

Posts by Matt


Total # Posts: 1,821

chemistry
given: Ferrocene, Acetylferrocene, 1, 1' Diacetylferrocene What part of the ferrocene compound(s) is(are) responsible for creating a dipole moment What type of molecular orbitals does the cyclopentadienyl ligand use to bond with the iron ion? How many electron pairs does ...
April 23, 2008

german
Anyone mind spellchecking this small text? =) Helga, die früher in Hamburg wohnte, ist nach München umgezogen. Sie verliebte sich in Gerd, der seine Arbeit in der Hauptstadt der Bayern hat. Hier hat er eine moderne Wohnung, die sie jetzt mit einander wohnen in. In ...
April 21, 2008

Chemistry
Pt is functioning as a cathode - D shows that Pt is cathode and Fe as anode. I don't understand why H+ and water are in the reaction so my answers 1)D 2)B
April 18, 2008

Chemistry
no, there's Fe in D for the first question..Fe(s)+8H+(aq)+MnO4–(aq)+Pt2+(aq)==> Mn2+(aq)+4H2O(l)+Fe2+(aq)+Pt(s)
April 18, 2008

Chemistry
#1, Fe(s) is on the left, so it's anode; Pt(s) is on the right, it's a cathode...so the rxn should be D. #2: B because Fe is gaining electrons, making it a reduction=cathode.
April 18, 2008

Chemistry
For the following electrochemical cell: Fe(s)/Fe2+(aq)//MnO4–(aq), Mn2+(aq)/ Pt(s) Which letter corresponds to the correct balanced chemical equation in an acidic solution? A. 2Mn2+(aq) + 8H2O(l) + 5Fe2+ ==> (aq)5Fe(s) + 16H+(aq) + 2MnO4–(aq) B. 5Fe(s) + 16H+(aq...
April 18, 2008

chem
Which reaction has been chosen as the 'standard' against which every other reaction is measured? A. Li+ + e– --> Li B. F2 + 2e– --> 2F– C. 2H+ + 2e– --> H2 D. O2 + 4H+ + 4e– ==> 2H2O E. H2 + 2e– ==> 2H
April 18, 2008

Chemistry
For the following balanced equation: 2 Ag+ (aq) + Cu(s)--> Cu2+ (aq) + 2 Ag(s) Which letter corresponds to the correct cell notation at standard state conditions? A. Cu(s)/Cu2+(aq)//Ag+(aq)/Ag(s) B. Cu2+(aq)/ Cu(s)// Ag(s)/ Ag+(aq) C. Ag+(aq)/ Cu2+(aq)// Cu(s)/ Ag(s) D. 2Ag...
April 18, 2008

chemistry
For the following balanced equation: 2 Ag+ (aq) + Cu(s) Cu2+ (aq) + 2 Ag(s) Which letter corresponds to the correct cell notation at standard state conditions? A. Cu(s) Cu2+(aq) Ag+(aq) Ag(s) B. Cu2+(aq) Cu(s) Ag(s) Ag+(aq) C. Ag+(aq) Cu2+(aq) Cu(s) Ag(s) D. 2Ag+(aq) Cu2+(aq...
April 18, 2008

math
Find the absolute extrema of the function f(x,y)=x+y-2xy on the region x^2+y^2<=1
April 15, 2008

Math
What happened after Chief Short Cake died?
April 14, 2008

Math
What happened when the Crossword Puzzle Champion died?
April 14, 2008

Math
In Music, What Does "Allegro" Mean?
April 14, 2008

english
How do I explain the answer please?
April 14, 2008

english
First, it seems clear that even if there are occasional small dips in the consumption of petroleum, the general trend shows no sign of a real permanent decrease. Second, petroleum reserves are not being discovered as fast as petroleum is currently being consumed. From these ...
April 14, 2008

english
Thanks
April 14, 2008

english
Relax. The kid’s been delivering the paper for, how long? Three, four years maybe? And not once has she missed us. The paper will be here, just wait and see. She’s just been delayed for some reason. a) true beyond a reasonable doubt b) probably true c) possibly true ...
April 14, 2008

english
You're a star!!
April 14, 2008

english
Michael Jackson has had more plastic surgery than anybody else in California. You can bet he’s had more than anybody in Connecticut! a) true beyond a reasonable doubt b) probably true c) possibly true or possibly false The answer is (C) possibly true or possibly false &#...
April 14, 2008

english
. Since the graduates of Harvard, Yale, Princeton, and other Ivy League schools generally score higher on the Graduate Record Examination than students from Central State, it follows that the Ivy League schools do more toward educating their students than Central State does. a...
April 14, 2008

english
Thank you
April 14, 2008

english
In three of the last four presidential races, the winner of the Iowa Republican primary has not captured the Republican nomination. Therefore, the winner of the next Iowa Republican primary will not capture the Republican nomination. a) true beyond a reasonable doubt b) ...
April 14, 2008

english
Thank you
April 14, 2008

english
You expect to get forty miles to the gallon in that? Why, that old wreck has a monster V8; besides, it’s fifty years old and needs an overhaul. a) true beyond a reasonable doubt b) probably true c) Possibly true or possibly false The answer is (C) possibly true or ...
April 14, 2008

English
Thanks
April 14, 2008

maths permutation & combination - answer pls check
Your password for a given website is made up of three letters followed by four numbers. Find the number of possible passwords if there are no restrictions on what three letters and what four numbers can be used. Pls check if my answer is correct 26C3*10C4 =26!/(26-3)!3! . 10...
April 13, 2008

maths permutation and combination
Thanks
April 13, 2008

maths permutation and combination - answer pls check
Pls check if my answer is correct 26C3*10C4 =26!/(26-3)!3! . 10!/(10-4)!4! = 26*25*24*23!/23!*6 . 10*9*8*7*6!/6!*4*3*2*1 =15600/6 * 5040/24 =2600*210 =546000
April 13, 2008

maths permutation and combination
Your password for a given website is made up of three letters followed by four numbers. Find the number of possible passwords if there are no restrictions on what three letters and what four numbers can be used.
April 13, 2008

critical thinking
thanks for the correction
April 13, 2008

critical thinking
n 1976 a powerful earthquake hit the city of Tangshan, China. Scientists had failed to predict the earthquake. If people had paid attention to the unusual animal behavior that preceded the earthquake, however, they would have known it was coming. Animals can often sense an ...
April 13, 2008

critical thinking
In 1976 a powerful earthquake hit the city of Tangshan, China. Scientists had failed to predict the earthquake. If people had paid attention to the unusual animal behavior that preceded the earthquake, however, they would have known it was coming. Animals can often sense an ...
April 13, 2008

Chemistry
Liquid Chromatography lab: Why is it important that the solvent level not drop below the upper level of the stationary phase once the stationary phase is packed in the column. is it because if the stationary phase dries out, then the mixture will be permanently absorbed
April 13, 2008

math riddle ALGEBRA WITH PIZZAZZ
He burned his lips on the exhuast pipe
April 6, 2008

biology
Hey can you help me out with these questions? What is the separation of homologous chromosomes during Anaphase I of meiosis called? What is the animal secretion serving as communication between members if the same species? Thanks?
April 5, 2008

math
The question is; identify the center and the radius of the circle in this equation. 3x^2 - √ 3x + 3y^2 - y + 1/12 = 0 I ended up getting C:(√ 3/6, 1/6) and R: √ 3/6
April 4, 2008

Math
I am thinking about going back to college and taking online math classes. I am eligible to take either financial mathmatics or contemporary math. But I am not really sure what the difference is between them. Is there one that is more easy than the other?
March 29, 2008

math [basic trig]
Sam and Markus are standing on level ground 100m apart. A large tree is due North of Markus and on a bearing of 065degrees from Sam. The top of the tree appears at an angle of elevation of 25 degrees to Sam and 15 degrees to Markus. Find the height of the tree.
March 25, 2008

Math
I seem to be having problems setting up Linear Programming questions. For example: Kustom Kars does van conversions. The Custom conversion required 15 hours of shop time, 8 hours of painting time, and 1 hour of inspection time. The Deluxe conversion requires 12 hours of ...
March 23, 2008

chemistry
A reaction rate increases by 60.3% when the temperature is increased from 21.5 to 35.6°C. Calculate the activation energy (in kJ/mol) for the reaction.
March 23, 2008

chemistry
how did you get No and N?
March 23, 2008

chemistry
Sulphuryl chloride, SO2Cl2, decomposes according to the following first-order reaction: SO2Cl2(g) ¨ SO2(g) + Cl2(g) At a certain temperature, it is observed that it takes 147 minutes for 23.0% of the sulphuryl chloride to react. Calculate the half-life for the ...
March 23, 2008

Biology, Please Help!
Why is it important that ions being transported across a cell membrane be shielded from the interior of the lipid bilayer?
March 19, 2008

Biology: Cells
Why is it important that ions being transported across a cell membrane be shielded from the interior of the lipid bilayer?
March 19, 2008

Language Arts
I need an iambic pentameter poem that sounds like guy has written it. Also to be about school.
March 18, 2008

science
please explain the difference between pitch and volume in sound
March 17, 2008

calc- thanks!
is this series convergent the series from n=0 to infinity of (n^2+1)/(n^3+1) i said it converged at n=1
March 17, 2008

calculus
does this series converge, and if so is it absolutely convergent? the series from n=1 to infinity of ((-1)^*n+1))/n^4 I found that by the ratio test it was inconclusive, so no abs. conv is this right? and how do i know if it is simply convergent?
March 17, 2008

calculus
does this series converge, and if so is it absolutely convergent? the series from n=1 to infinity of ((-1)^*n+1))/n^4 I found that by the ratio test it was inconclusive, so no abs. conv is this right? and how do i know if it is simply convergent?
March 17, 2008

pre-calculus
given that c is the logarithm of x in base a, and d is the logarithm of x in base b, find the general statement that expresses the log of x in base ab, in terms of c and d. [*subscripts not included: a,b,ab] loga_x=c ; logb_x=d ...logab_x = [in terms of c and d]
March 16, 2008

chemistry
what is the hybridization at O with the lewis structure of 2-propanone?
March 13, 2008

college calculus
how do you intergrate sqrt((1+((1/4)/(4-x^2)))
March 11, 2008

college calculus
how do you integrate sqrt( x^2 - (x^2)(e^(-2x)) )?
March 11, 2008

chemistry
is calcium carbonate a base? (whats its ph?)
March 6, 2008

calculus
integrate (x+2)/((x^2+2x+4)^2) the usual partial fractions dont work???
March 3, 2008

Chemistr repost
Determine the cell potential (in V) for a platinum electrode in an acidic solution of 0.004M H+(aq), 3.226M ClO4-(aq) and 4.445M ClO3- (aq) ions, coupled to a gold electrode in 3.238 M Au3+ (aq) at 307.10 K. Im confused about the mulitple molarities given for the platinum ...
March 1, 2008

Chemistry
Determine the cell potential (in V) for a platinum electrode in an acidic solution of 0.004M H+(aq), 3.226M ClO4-(aq) and 4.445M ClO3- (aq) ions, coupled to a gold electrode in 3.238 M Au3+ (aq) at 307.10 K. Im confused about the mulitple molarities given for the platinum ...
March 1, 2008

College Calculus
Could someone explain how to distinguish improper integrals in non-mathematical terms so I may understand? Thanks!
February 28, 2008

Maths
Thank you
February 28, 2008

Maths
Solve the problem. Assume that simple interest is being calculated. Round your answer to the nearest cent. Susie borrowed $7500. from a bank for 18 months with interest of 5% per year. Find the total amount she repaid on the due date of the loan. (Use: I=prt)
February 28, 2008

chemistry
If the molecular speed of a gas increases, its rate of diffusion will__________.
February 27, 2008

Chem
what's the answer?
February 27, 2008

General Chemistry
Vinegar is a 5.0% solution by weight of acetic acid in water. Given that the pH for vinegar is 2.41 and that Ka= 1.8E-5 and the density s 1.00g/mL, what is the percent dissociation of acetic acid in vinegar? I know the % dissociation equals the amount which did dissociate 5.0%...
February 27, 2008

Physics
It is probably easy, but i don't know where to start A hockey puck leaves a player's stick with a speed of 9.50 m/s and slides 27.0 m before coming to rest. Find the coefficient of friction between the puck and the ice. Thank You for helping me!!!
February 25, 2008

physics
the tension T=ma, since the only acceleration is that due to gravity.. a=g (9.8m/s^2) so T=0.442*9.8
February 25, 2008

Science Proof-reader needed!
The current research project involves examining the photoreceptors of the fruit fly, Drosophila Melanogaster. Over the last 6 weeks, I have been spending about 2 hours a week working with a program called ImageJ and various slices of photoreceptor cells of Drosphila. I have ...
February 20, 2008

Proofread/Editing
The current research project involves examining the photoreceptors of the fruit fly, Drosophila Melanogaster. Over the last 6 weeks, I have been spending about 2 hours a week working with a program called ImageJ and various slices of photoreceptor cells of Drosphila. I have ...
February 20, 2008

Chemistry
Could I plese have an example of a everday experience of a chemical process for which a rate increases with temperature? I thought of ice melting but its a physical change...
February 19, 2008

College Calculus
What is the integral of cos^6x? I tried half angle identities but it didn't really help...
February 18, 2008

Chemistry
Calculate ∆G (in kJ) at 541 K for the following reaction under the given conditions. Use data obtained from the table below and assume that ∆Hfo and So do not vary with temperature. Report your answer to three significant figures in scientific notation (i.e. 1.23E4...
February 17, 2008

Psychology
What are electrolytic lesions in terms of psychology and the brain? I can't find it anywhere and I dont know what it means...
February 11, 2008

Bio-Genetics
In watermelons the allele for green color and for short shape are dominant over the alleles for striped color and for long shape. A plant with long striped fruit is crossed with one heterozygous for both characteristics. The results are: green, short: 14 green, long: 96 ...
February 9, 2008

Algebra 1
Since it takes 25 minutes at 37.5 MPH, we know that in 60 minutes, they would go 37.5 miles. We need to know how long to commute is. 25/60 = 5/12, so you multiply 37.5 by 5/12. The answer is 15.625, this is how long the commute is. 15 MPH is 4 minutes per mile, so you multiply...
February 7, 2008

Chemistry
The total pressure in a flask containing air and ethanol at 25.7 C is 878 mm Hg. The pressure of the air in the flask at 25.7 C is 762 mm Hg. If the flask is immersed in a water bath at 45.0 C, the total pressure is 980 mm Hg. The vapor pressure of ethanol at the new ...
February 4, 2008

chemistry
A) If you make up a solution of 50 mL of 0.1 M TRIS in the acid form, what will be the pH? (pka of TRIS: 8.3, molecular wt: 121.1 g) B) if you add 2mL of 1 M NaOH to the solution, what will be the pH? Thank you.
February 2, 2008

chemistry
When Dr. Farrell was a graduate student, he once made up a pH 8.0 sodium acetate buffer. Why would the casual observer to this buffering faux pas come to the conclusion that he had the intellectual agility of a small soap dish?
February 2, 2008

chem
The total pressure in a flask containing air and ethanol at 257C is 845 mm Hg. If the pressure of the air in the flask is 762 mm Hg, the vapor pressure of ethanol is ? mm Hg.
January 31, 2008

Physics
well 1 W = J/s So, 19 kW is 19000 J/s. But you want to find time, so you want to have seconds in the denominator, you you would multiply the inverse of the watts times the amount of work. so (1 sec/19000 J) * (6.8 X 10^7 J) Joules should cancel out with joules and you should ...
January 29, 2008

Lab Equipment
alright sorry, I posted that before I saw your second answer but number 2 is crucible so I am all set.
January 29, 2008

Lab Equipment
thanks, I also found that number 1 wish wire gauze. Now I just need number 2
January 29, 2008

Lab Equipment
What is a square mesh with a fiber center used for support? 9 letters, ends with an E What is a porcelain container used to heat things? 8 letters, second letter is "R" What type of bottle is used for storing acids and bases? 7 letters, _E_G_ _T Help? Thanks!
January 29, 2008

Algebra
you cant do that, Miley, the m's and n's are separated by an addition sign, so you cant use the quotient of powers rule
January 28, 2008

Algebra
SImplify: (x - 9/x) / (1 + x/3) and (m^-1 + n^-1) / (m^-3 + n^-3) I have no idea what to do
January 28, 2008

physics
a pulley with rotational inertia of 1.5 times 10 ^-3 kg times m^2 about its axle and a radius of 15 cm is acted on by a force applied tangentially at its rim. The force magnitude varies in time as F=.5t + .3 t^2, where F is in newtons and t in seconds. The pulley is initiall ...
January 28, 2008

Chemistry
Hey, can you help me balance this equation? Cu2S + HNO3 --> Cu(NO3)2 + CuSO4 + NO2 +H2O Thanks!
January 24, 2008

AP CHEM
thanks
January 24, 2008

AP CHEM
what type of cubic structure is iron?
January 24, 2008

Chemistry
thanks, this is how i calculated it: 1 mol Fe/.141 mol/cm^3 = 7.10 cm^3 (the .141 came from converting the density in to moles) is that correct? then the next step in the problem is to find the volume of 1 mol of Fe atoms assuming each atom to be spherical. the atomic radius ...
January 24, 2008

Chemistry
The density of iron at 25 C is 7.871 g/cm^3 what is the volume of one mole of solid iron at 25 C? i understand that volume = m/d but how would i go about solving this?
January 24, 2008

AP CHEM
The density of iron at 25 C is 7.871 g/cm^3 what is the volume of one mole of solid iron at 25 C? i understand that volume = m/d but how would i go about solving this?
January 23, 2008

CHEMISTRY
how is liquid or the inital mass relevant to the question, if we're only concerned with the gas?
January 20, 2008

CHEMISTRY
A glass vessel has a mass of 53.8718 g when evacuated (no air). When filled with a liquid of density 1.319 g mL-1 it has a mass of 255.7390 g and when filled with an unknown gas at 752.3 torr and 16.12°C it has a mass of 54.2483 g. What is the molar mass of the gas, ...
January 20, 2008

For DrBob222
thank you so much for your help, i know it wasnt that difficult, i think i just confused myself with the temperatures. i get the answer now.
January 19, 2008

For DrBob222
i had to convert 38.3 to kelvin... because i converted the initial T to kelvin.
January 19, 2008

For DrBob222
the chemistry question: v=0.465L T=559.15K P=112.496 kPa Pv/t = Pv/t 112.kpa(0.465)/559.15 = (x)(0.464428)/(247.8) x= 49.9 kPa ...i skipped conversion steps, but i'm pretty sure i did those right..
January 19, 2008

Chemistry
A sample of Kr gas has a volume of 465 mL at 286°C and 844 torr. When the gas is cooled by 38.3°C, its volume is reduced by 0.572 mL. What is the final pressure of the gas in kPa? the answer is supposed to be 105 but i keep getting 49.9!!!!!!
January 19, 2008

CHEMISTRY
A 8.90-g sample of ethane, C2H6, is mixed with 18.8 atm of O2 (an excess) in a 1.50 L combustion chamber at 130.0°C. The combustion reaction to CO2 and H2O is initiated and the vessel is cooled back to 130.0°C. What is the final pressure in the combustion chamber ...
January 17, 2008

science
what is a mineral
January 17, 2008

Chem Midterm Review
Ok, so I've been really busy with midterms and my chemistry one is tomorrow. Now, I never intended to let so much time slip by before i started studying, but it happened. It's one of my most important exams. Do I still have a chance of passing? If so, how should I ...
January 16, 2008

math
a. y= 4x b. y= 2x c. y= 1 half x
January 14, 2008

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