Sunday
April 26, 2015

Posts by Alice


Total # Posts: 595

Chemistry
Write balanced equations for the formation of [Ni(NH3)6][BF4]2 starting from an anhydrous sample of nickel(II) choride hexahydrate. (3 equations necessary) I am slightly confused by this. I think the starting sample has the formula [Ni(H20)6]Cl2 Would this react with ammonia...
March 11, 2009

Chemistry
I think that nickel(II) nitrate has the formula Ni(NO3)2. As we are starting from anhyrdrous nickel nitrate I thought the first step might be to hydrate it Ni(NO3)2 + 6H2O --> [Ni(H2O)6](NO3)2 and then I thought a reaction with potassium thiocyanate KSCN but I am not sure ...
March 11, 2009

Chemistry
Write balanced equations for the formation of K4[Ni(NCS)6] starting from an anhydrous sample of nickel(II) nitrate. (3 equations necessary)
March 11, 2009

Chemistry
What is a balanced equation for the formation of [Co(NH3)5Cl]2+ from [Co(NH3)5(OH2)]3+ ?
March 4, 2009

Math
Which 3 x 3 matrix represents a reflection in the yz plane followed by inversion through the origin?
February 24, 2009

trig!!
Sin(X-y)sin(x+y)=sin^2 x - sin^2 y work on one side only...so i worked on the right =(sinx-siny)(sinx+siny) does that equal sin(x-y)sin(x+y)??? help!
February 21, 2009

Trig
Sin(X-y)sin(x+y)=sin^2 x - sin^2 y work on one side only...so i worked on the right =(sinx-siny)(sinx+siny) does that equal sin(x-y)sin(x+y)??? help!
February 21, 2009

Chemistry
What would be the molality of a solution made up of 75cm^3 of water and 0.21 g of NaCl?
February 19, 2009

math
body of mass 7 kg moves in a (counterclockwise) circular path of radius 4 meters, making one revolution every 13 seconds. You may assume the circle is in the xy-plane, and so you may ignore the third component. how do you find the centripetal force acting on the body how do ...
February 18, 2009

math
A gun has a muzzle speed of 90 meters per second. What angle of elevation should be used to hit an object 180 meters away? Neglect air resistance and use 9.8m/s^2 as the acceleration of gravity.
February 18, 2009

math
how do you find the curvature k(t) of the curve r(t)=(-2sint)i+(-2sint)j+(-4cost)k?
February 18, 2009

writing
What should I write my narrative poem about that will make my class laugh? There has to be 4 stanzas and each have to have 3 lines.
February 16, 2009

Chemistry
What is the pH of a solution made up of 50cm^3 of 1M Ethanoic Acid and 25cm^3 of 1M sodium ethanoate? Assume Ka for Ethanoic acid is 1.8 x 10^-5 mol dm^-3 I'm not quite sure how to do this. I was going to use the equation pH = pKa + log[A-]/[HA] but it doesn't seem to ...
February 16, 2009

math
Tank 1 initial contains 70 L (liters) of water and 450 g of salt, while tank 2 initially contains 20 L of water and 200 g of salt. Water containing 10 g/L of salt is poured into tank1 at a rate of 1 L/min while the mixture flowing into tank 2 contains a salt concentration of ...
February 6, 2009

Spanish
What does Pablo Neruda refer to in the last verse of his poem "La Anaconda Copper Mining Company"? "Y hay una y otra cruz torcida en las laderas infernales como única leña dispersa del árbol de la minería."
February 6, 2009

8th grade
What is domain?
February 6, 2009

8th Grade Math (Algebra1)
What is domain?
February 3, 2009

Maths
A particle rotates in a circular orbit about a point located 30cm away, with angular speed 2 rad s^-1. If the angular momentum is 0.2 Js, determine the mass of the particle. I used L=mr^2 omega and got 1.11kg A constant torque of 0.2Nm accelerates the particle for 5s. ...
February 2, 2009

math
how do you find the differential equation for t(dy/dt)+9y=8t and y(1)=6?
January 29, 2009

math
how do you find the function to satisfy y'-2y=2e^(3t) and where y(0)=-5?
January 29, 2009

math
how do you find the solution to (dy/dx)+ycos(x)=6cos(x) when the initial conditions y(0)=8? all i can get is y(x)=e^sin(x) + 7
January 29, 2009

social studies
What from nature might have given the Egyptians the belief that they would have life after death?
January 22, 2009

Chemistry
The cell Pt|H2(1 bar)|HCl(m)|AgCl(s)|Ag has an Stadard elctrode potential value of 0.2224V at 298K Using the Nernst equation, calculate a value for the EMF when the HCl concentration is 0.20M. I know what the Nernst equation is but I am unsure how to use it when I only have ...
January 14, 2009

math
How do you find the area of irregular figures using 3.14 for pi?
January 13, 2009

math
How do you find the area for an irregular figure using 3.14 for pi?
January 13, 2009

english
Say one of the funniest moments you had in school and tell them why that was so memorable and funny
January 13, 2009

AP World History
Well we are doing a project on empire building and we had to answer a couple of questions. I looked all over the internet and I can't find answers to these four questions. this is due tomorrow so I'm really desperate. Can someone help me out? My empire is the Spanish ...
January 11, 2009

Chemistry
One mole of nirtogen at 273K occupying 10 litres (state 1) is to be expanded to a volume of 20 litres at 373K (state 2). An infinite number of paths from state 1 to state 2 are possible. Consider the following important paths: (a) The gas is expanded isothermally and ...
January 8, 2009

6th grade
I'm supposed to write a paper on the "real" reason behind not running in the house. It's just why you think you shouldn't run in the house, just something funny nothing real. What should I say is the reason, that will make my class laugh?
January 7, 2009

Chemistry
A conductivity cell was calibrated using KCl solution (0.01 mol dm^-3) with a conductivity of 0.141 S m^-1 and the resistance was found to be 520 Ohms. The resistance of a saturated solution of silver chloride was found to be 3.8 x 10^5 Ohms. Calculate the solubility product ...
January 4, 2009

Chemistry
Which phosphates are found in human urine? I am writing about the discovery of phosphorus. I know that after urine was left to stand for several days and boiled to a paste it contained ammonium sodium hydrogen phosphate. Is this a constituent of fresh urine or did a reaction ...
January 4, 2009

English
Such a person as he/him is.... use "he"or"him"?
December 20, 2008

Chemistry
What is a definition for i) radial wavefunction ii) angular wavefunction What is the physical meaning of each?
November 30, 2008

Chemistry
An ammonium halide A contains 9.664% nitrogen. Identify A.
November 20, 2008

math
How else can you write x^2+4x-15?
November 18, 2008

calculus
this is part of calculus cause i need it to find critical points of a graph
November 18, 2008

calculus
solve 4x^3-6x+2=0 for all x
November 18, 2008

Math
Find the stationary points of function E(a,b) = a^4 - 2a^2 + 2b^2 and classify each of these as either a minimum, maximum or saddle point.
November 14, 2008

Chemistry/Math
No, I can't find one for a second order reaction.
November 10, 2008

Chemistry/Math
Write a differential equation describing a second order reaction – a reaction in which the rate of depletion of the concentration of the reactants depends on the square of reactants’ concentration. Solve this differential equation and hence find an expression for the...
November 10, 2008

Math
Find the specific solution for the following differential equations: a) (dy/dx)^2 - x^4 = 0 given the initial value y(1) = 0 b) dy/dx = ysinx given the initial value y(pi) = 1
November 9, 2008

Maths
P=(2J+1)exp(-(BJ(J+1))/kT) where B, k and T are constants a. Show that dP/dJ=(2-(B(2J+1)^2)/kT)exp(-BJ(J+1)/kT) b. Show that P exhibits a maximum and determine the expression for Jmax c. Find the value of P when J=0 and the limiting value of P when J becomes large(infinity).
October 28, 2008

physics
Ok, I am not sure how to about about solving this problem and have been staring at it and drawing pictures for several hours now. Do I use the spring equation for potential energy? Or is it a momentum problem where I should assume the spring has it's own velocity? Any help...
October 19, 2008

Maths
I think to plot it as a straight line you would plot logy on the y-axis against logx on the x-axis, but I'm not sure.
October 18, 2008

Maths
Transform the following relationships/funtions into linear form and identify expressions for the x and y variables. a) (x^2/a^2) + (y^2/b^2) = 1 where a and b are constants. b) k(T) = (kT/h)exp((deltaS)/R)exp(-(deltaH)/RT) where k, deltaS, deltaH and R are constants.
October 18, 2008

Maths
A(t)=A'e^(-t/r) where A(t) is the amount after time t, A' is the initial amount at t=0 and r is the decay time. Give an interpretation of the parameter r.
October 10, 2008

Chemistry
Given that for ethanoic acid pKa=4.75, calculate the pH of sodium ethanoate 0.1M.
September 26, 2008

chemistry
that's what I don't understand! :(
September 11, 2008

chemistry
a cubic piece of metal measures 5.00 cm on each edge. if the metal is nickel, whose density is 8.90g/cm cubed, what is the mass of the cube?
September 11, 2008

Chemistry
I have worked out that the element is nitrogen and the first hydride is NH3. I calculated the second hydride to have the empirical formula NH2. Would the molecular formula be N2H6? I'm not too sure about the structures.
September 2, 2008

Chemistry
Two hydrides A and B of an element X contain 17.76% and 12.58% by mass of hydrogen. Identify A and B and comment on their structures.
September 2, 2008

algebra 1
simplify 11/12-(1/3+1/4)
July 15, 2008

Economics
How to explain the differences in prices of "homogeneous" goods among sellers.
June 25, 2008

English-Accented Syllables
The accented syllable is the syllable in the word that you automatically say louder or more clearly.
June 19, 2008

year 7 geography
research which instruments are needed to measure which feature of the weather Temperature , Precipitation , Cloud cover , Cloud type , Wind direction , Wind speed , Visibility. The example i have got is visibility - eyes and instruments Does the question mean you have to put ...
June 2, 2008

Calculus
OK I understand the concept present value but I don't understand how to solve for present value in this context: Assume that you won a local contest for which you gain a continuous income stream at a rate R(t)=5000e^0.1t per year for 5 years and r=0.05. Find present value...
April 29, 2008

algebra
A certain population of bacteria doubles every 3 weeks. How long will it take for a population of 3,500 to triple?
April 27, 2008

Caluculus
Can anyone help me with this problem? Suppose that during a controlled experiment, the temperature in a beaker containing some chemical substance at time t is rising at a rate of (15/13)t^2-(7t) degrees centigrade per minute. If the temperature after 1 minute is measured to be...
April 22, 2008

Spanish homework
Sorry, I made a mistake. INstead of 'When poachers steal the eggs came' it should be 'When poachers come to steal the eggs.'
April 12, 2008

Spanish homework
Yesterday, I saw Martin Luther sitting on top of a large pumpkin. A cabbage fell from the sky and hit him in the head. Martin Luther was angry and swore at the cabbage. Most people do not know this, but Ralph Waldo Emerson is still alive. He was found buried under a layer of ...
April 12, 2008

English/Spanish
And "sorry" is triste
April 11, 2008

English/Spanish
By th wat the Spanish word for 'homework' is tarea
April 11, 2008

English/Spanish
No matter. If you need to translate it just type it in at Google Translate.
April 11, 2008

SOCIAL STUDIES
NAME A MONARCHY
April 8, 2008

Social Studies
OMG I AM SO SORRY I DIDN'T MEAN TO POST THAT ON THIIIS SITE...SORRRYY
April 4, 2008

Social Studies
WOOOOOOOOOOOOOOOOOOO ...
April 4, 2008

English
Does anyone know any specific poems or a website with poems that may relate to any of these themes...? - loss of innocence/youth - taking a chance - being yourself - imagination vs. reality any poems relating to these will do! even a poem that is opposite of the theme will be ...
April 2, 2008

English
2 questions: 1. what is the one poetic device called thats an extended metaphor and can last for mostly all of the entire poem? 2. what is the conceit that the tv shows 'rugrats' and 'family guy' share with regards to biabies and speech????? thanks!
April 2, 2008

Caluculus
Does anyone know how to find the derivative of 3x^ln(2x)?
March 27, 2008

calculus
This is stupid, but can anyone find the derivative of f(x)=8^(1-2x^2)?
March 23, 2008

math
Are these answers correct 4.0171 Answer: 4 171/10,000 Arrange in order from smallest to largest 2.05, 25/10, 2.0513, 2.059, 251/100, 20515, 2.052, 2.051. Answer: 2.05, 2.051, 2.0513, 2.0515, 2.052, 2.059, 251/100, 25/10 45.6 – 8.75 Answer: 36.85 Add thirty-eight and nine ...
February 20, 2008

statistics
In the U.S. 42% of the population has type A blood. Consider taking a sample size 4. Let y denote the number of persons in the sample with type A blood. a)Pr(y=O) b)Pr(y=1) C)Pr(y=2)
February 5, 2008

Social Studies
Did Bismarck form any tax LAWS that were not approved by the Reichstag?
February 5, 2008

chemistry
what happens when a hot empty coke can is put in a icy cold water ? what is the reaction?
October 16, 2007

chemistry
assuming that the calorimeter contains 5.00 * 100 g of water and that the initial temperature is 30.0 degree celcius. what will the final temperature be? (use the proper formula and units, and show your work below)
October 9, 2007

chemistry
the value of this quantity for water is ?
October 9, 2007

chemistry
the unit in which the quantity of heat energy is usually expressed is called the ?
October 9, 2007

Legal and Ethical
why might legal rules be insufficient for fulfilling one's ethical responsibilities?
October 9, 2007

Chemistry
I need to come up with an idea of an experiment using only baking soda, sodium chloride,a test tube, soapy water, a scale to measure the mass, and a stop watch..... any ideas...of the procedures to use..? help would be nice thank you soo much!!! =p
September 18, 2007

BIOLOGY
[Proton]+1 [neutron] 0 [electron] -1
September 18, 2007

anatomy and physiology II
why does air move into the lungs? Bob Pursley answered this question for you earlier. See you previous post of the same question
July 13, 2007

anatomy and physiology II
Any compound that can stimulate the body to produce antibodies is call what? You will find the answer at http://en.wikipedia.org/wiki/Antigen
July 13, 2007

anatomy and physiology II
air moves into the lungs bacause? Pressure difference between the lungs and the atmosphere. THe diaphram movement causes this.
July 13, 2007

anatomy and physiology II
The respiratory menbrane lining the air sacs consist of what? The actual site of gas exchange within the lungs are? the actual site of gas exchange in the lungs are at the capillaries (smallest blood vessels) You are talking about the alveoli. Since this is not my area of ...
July 13, 2007

History
I'm doing a project on Medieval nights- please help! How did chivalry reflect medieval culture especially religon? Its due on Monday and i still have HEAPS to do!!!!! Please help me! You mean Medieval knights, right? If you spell it wrong during a search on Google or any ...
May 12, 2007

chemistry
take the amount of grams (.548) and multiply it by .628 You then get .37373 (this is the concentration of ASA that the problem is focusing on) So you divide .37373 by 180.16 to figure out the amount of moles= .002075, divide this number by .250L to get your Molarity, your ...
May 10, 2007

Spanish
I would like to know if my answers to the following questions are correct: ¿Qué es lo importante para tí en un trabajo? Opino que un trabajo debe ser interesante. Me gustaría un trabajo que es un desafío y pienso que es bueno si paga bien, ...
April 26, 2007

Chemistry
I want to know the enthalpy change for this reaction which occurs in a blast furnace: Fe2O3(s) + 3C(s) --> 2Fe(l) + 3CO(g) You will need the heat of formation for CO, and ironIIIoxide, and the heatofmelting for iron. I suspect you have some temperature in mind also which ...
April 15, 2007

math
14.what value of n will result in a mean if 31 15.what value of n will result in a median of 23 15.what value of a will result in a range of 84 14,46,19,10,39,22,24,77,n Refresh your memory about the defnition of median, mode and range of a set of numbers. Then pick a value of...
March 4, 2007

French
I'm trying to figure out how you would say "he is being" in French. I know it has something to do with the present participle "étant," but we haven't really gotten very far into this yet in class. Would you say "il est étant"...
March 4, 2007

home economics
what are the different names of equipment used for cooking? Please post the names of the equipment that you know. Then, we'll be glad to help you find more names, if necessary.
February 5, 2007

GEOMETTRY
HOW MANY VERTEXS DOES A HEXAGON HAVE? Draw a hexagon, a six sided figure, and count the vertices. Thank you for using the Jiskha Homework Help Forum. The following site may help you to see this: http://en.wikipedia.org/wiki/Hexagonal_tiling seee
January 7, 2007

firms
what are 3 disadvantages of firms merging? Sometimes when firms merge, the company is simply too large or diverse for the management to handle. Sometimes the profits from one of the businesses don't increase as fast as was originally expected. Also -- there's a ...
November 13, 2006

pre-calculus
THe sume of 2 positive numbers is 20. Find the two numbers such that 1) the sum of the square is minimum b) the product of one and the square is maximum. c) the product of the square and one and the cube of the other is maximum I will be happy to critique your work on this.
November 11, 2006

trig question
A Ferris wheel has a deameter of 50m. The platform at the bottom, where you load the ferris wheel, is 3 m above the ground. The Ferris wheel rotates three times every two minutes. A stopwatch is started and you notice you are even with the center of the ferris wheel, going ...
November 2, 2006

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