Saturday
February 13, 2016

Posts by lena

Total # Posts: 1,032

Careers
Thank you :D
November 30, 2009

Careers
Are there any careers where business and social sciences overlap? I can't decide between what I wanna do. I enjoy both.
November 30, 2009

MLA FORMAT
Thank you very much :)
November 25, 2009

MLA FORMAT
There is apparently a new way of writing a bibliography in MLA format. I google searched and I'm not sure which is new and which is old. Could someone provide an example of how I would write the bibliography of a novel? Thank you
November 25, 2009

Math
The graph of the cosine function is the same as the graph of the sine function but translated: a) 90 degrees to the right b) 90 degrees to the left c) 180 degrees to the right d) 180 degrees to the left I was thinking it could a) and b) but there can only be one answer. Could ...
November 18, 2009

Thomas Malthus
Thanks :D
November 15, 2009

Thomas Malthus
Thanks a bunch bobpursley :D
November 15, 2009

Thomas Malthus
Thank you Ms. Sue. The question also asked about Earth's history. So I'm thinking that is about how the Earth was formed and such. Malthus didn't make an references to that either so I would say the same about that as well?
November 15, 2009

Thomas Malthus
In the assignment I'm doing, there's a question that asks for whether Thomas Malthus believed in evolution or not. I don't know what to say considering he never made any direct references to it. I know he was a Reverend so I'm thinking he believed in ...
November 15, 2009

Thomas Malthus
Thanks a bunch Ms. Sue :D
November 15, 2009

Thomas Malthus
Thank you bobpursley :) I have another question if you don't mind answering it. In his essay, did he say anything about how the Earth came to be and anything on evolution? I read through what you sent and several other sources and I don't recall him making any ...
November 15, 2009

Thomas Malthus
Thanks :D
November 15, 2009

Thomas Malthus
Thomas Malthus was a clergyman so is it safe to say that he did not believe in anything opposing the bible? Is it safe to say that as a firm believer in faith, he was certain that God created the Earth and the life on it? What can i say about Malthus's views on the Earth&#...
November 15, 2009

ENGLISH
In the Handmaid's Tale by Margret Atwood, does the Handmaid system actually repopulate the state?
November 12, 2009

Math
Conner estimated that the radius of one of the circles on the playground was 2 yards. If Conner was correct then: a. the radius was how many feet? b. the diameter was how many feet? Thanks!
November 5, 2009

careers
Thanks :D
November 4, 2009

careers
what jobs have a starting salary atleast (or around) 50,000 and have a high employment rate. I know nursing is one. Are there others that aren't in the medical field?
November 4, 2009

Math
Thank you very much for your help. everything makes sense and I got 100% on my answer.
October 16, 2009

Biology
I think what we did was called the Hill Reaction
October 2, 2009

Biology
We did a lab with a spectrometer and we had curvettes with chloroplasts, phosphate buffer,water a DCPIP. And a light was shone through. Then we got the data for light absorbed. What does that mean? Like the higher the percentage of light absorbed, the more the DCPIP got reduced?
October 2, 2009

Biology
Are chlorplasts necessary for the reduction of DCPIP? why or why not? and is light necessary for the reduction of DCPIP? why or why not? I
October 2, 2009

English
"Some, when they take revenge, are desirous the party should know whence it cometh. This is more generous. For the delight seemth to be not so much in doing the hurt in making the party repent. But base and craft cowrds are like the arrow that flieth in the darl" ...
October 2, 2009

Bio
Is going from fructose 6-phosphate to fructose 1,6-bisphosphate, phosphorolation?
October 1, 2009

Bio
why is energy absorbed twice in the light reactions in photosynthesis
September 30, 2009

The Excavation : By Augusto Roa Bastos
I read this short story and I understand it pretty much but there are some things Im confused about. Were all the people in Cell 5 murdered by machine gun fire? Did Perucho Rodi escape from Cell 4 and avoid getting caught as one of the people involved? Was Perucho Rodi the one...
September 26, 2009

Science
When we look at a leaf, we see the colors of light that are reflected off its surface. How does this explain there relatively low flow of oxygen in green light?
September 24, 2009

Science
When we look at a leaf, we see the colors of light that are reflected off its surface. How does this explain there relatively low flow of oxygen in green light?
September 24, 2009

english
Thanks :D
September 23, 2009

english
It is quite alone, standing well back from the road, quite three miles from the village… It makes me think of English places that you read about, for there are hedges and walls and gates that lock…For the windows are barred for little children and there are rings and...
September 23, 2009

English
Thank you :D
September 23, 2009

English
Men would carry out an ideological prison that subjected and silenced women. What does that mean?
September 23, 2009

English
Thank you :)
September 23, 2009

English
Is it wrong to start your intro with the name of the media text. For example: "The Secret Life of Walter Mitty," byt James Thurber is a ....
September 23, 2009

physics
how does a magnify glass create a virtual image?
September 21, 2009

Chem
Why are electrons paired in orbits?
September 21, 2009

Math
(9x)^1/2 (8x)^1/3 would the 1/2 be distributed to the 9 and the x or is 9x one term and the 1/2 is given to the whole term? thanks :)
September 16, 2009

english
We must not squander our power, helplessly and ignorantly, squirting half the house in order to water a single rose-bush (1).” I was thinking that this quote means to focus on one thing at a time. Is there anything else I am missing from it. It's from Virginia Woolf; ...
September 11, 2009

English
Thanks a bunch :D
September 11, 2009

English
If you hang back and reserve and criticise at first, you are preventing yourself from getting the fullest possible value from what you read. But if you open your mind as widely as possible, then signs and hints of almost imperceptible fineness, from the twist and turn of the ...
September 11, 2009

Math:Polynomial Functions
Thank you :D
September 8, 2009

Math:Polynomial Functions
and for something like y=cosx that dosent work cause cos is not a real number?
September 8, 2009

Math:Polynomial Functions
must the value of n always be nonnegetive?
September 8, 2009

Math:Polynomial Functions
why would something like y=x^-3 not be a polynomial function?
September 8, 2009

Math:Polynomial Functions
h(x) = -7x I was thinking that this was not a polynomial function because -7x is just one term making it a monomial but the answer key says it is a polynomial function. Could someone explain why that is so? Thanks :D
September 8, 2009

Chem
thanks :)
July 29, 2009

Chem
My teacher adds the 2 half reactions. What is that called?
July 29, 2009

Chem
if I add them together they become the redox reaction?
July 29, 2009

Chem
How do you write redox reactions. I was given this equation below: 2Mg + O2 --> 2MgO I have to write the redox reaction
July 29, 2009

chem
Thanks :D
July 27, 2009

chem
un-ionized aspirn molecules can readily penetrate the stomach lining into a region of less adicity. This is where the stomach irritation associated with aspirn occurs. Use Le Chatelier's principle to explain why irritation occurs in this area. Could someone explain the ...
July 27, 2009

pH calculations
Thank you :D
July 27, 2009

pH calculations
A backyard pool as a pH of 7.4. At this level, the concentrations of hypochlorus acid and hypochlorite are approximetly equal. HClO(aq) <--> H^+ (aq) + ClO^- (aq) (a) Predict the effect of increasing pH has on the concentration of HClO(aq) in the pool. For this question...
July 27, 2009

Chem
The question is telling me that NaOH (24.00 grams) is diluted in water (750 mL). Find the pH and pOH. This is what I did so far: NaOH ---> Na+ + OH- NaOH: mass = 24.00 grams v= 750 ml = 0.750 L M= 40.00 grams/mol n= 0.6000 mol c= 0.800 mol/L Since NaOH dissociates 100%, the...
July 27, 2009

Chem
Thanks :D
July 27, 2009

Chem
Co2(g) ---> CO2(l) + heat This equation was given to me and asked why high pressure was needed to keep carbon dioxide in the liquid state. With the information given; I don't exactly know how to answer the question. How do you increase the pressure of a liquid. For ...
July 27, 2009

Chem
Dr Bob, I think I read the questions wrong. It said that un-ionized aspirn molecules can readily penetrate the stomach lining into a regio of less adicity. This is where the stomach irritation associated with aspirn occurs. Use le Chateliers principle to explain why irritation...
July 26, 2009

Chem
The question asked why the irritation occur specifically in the area of lower acidity.
July 26, 2009

Chem
Le Chatelier's principle involves equillibriums. I don't understand the equillibrium involved in thsi situation?
July 26, 2009

Chem
I have another question related to this one. The un-ionized aspirn penetrates the area of the stomach were there is less acidity thus causing irritation. How would Le Chatelier's principle explain why the irritation occurs?
July 26, 2009

Chem
Ohhh. Should have thought about that. Thanks a lot Dr Bob :D
July 26, 2009

Chem
What does the comparison tell us? :S Does it tell us that there is more acid than aspirn?
July 26, 2009

Chem
did you do this to find out A-: 3.2 x 10^-4 = (10^-1.5)^2/HA
July 26, 2009

Chem
are we doing the ratio between the number of mols? ;S
July 26, 2009

Chem
Isn't the ratio of Hasp to asp 1 from the balanced chemical equation?
July 26, 2009

Chem
stomach wall has a protective lining of mucous that prevent the acid from penetrating the underlying tissues. using asprin too often can damage the stomach wall. Aspirn is a weak carboxlyliic acid with a Ka of 3.2 x 10^-4. HC8H7O2CO2(aq) <--> H^+(aq) + C8H7O2CO2^-(aq) ...
July 26, 2009

Chem
didn't I give K to one place :S 4 x 10^-10 I dont understand how it is 2 decimal places. 0.1 only has one signifcant digit
July 26, 2009

Chem
didn't I give K to one place :S 4 x 10^-10 I dont understand how it is 2 decimal places. 0.1 only has one signifca
July 26, 2009

Chem
but would I keep one significant digit cause on the 0.1?
July 26, 2009

Chem
This is what I did: pH = 8.81 pH + pOH = 14 pOH = 5.19 [OH-] = 10^-5.19 = 6.64 x 10^-6 __ArNH2 + HOH ==> ArNH4^+ + OH^- I 0.1_____________O___________O C -6.46 x 10^-6 +6.46 x 10^-6 +6.46 x 10^-6 E 0.1-6.46 x 10^-6 +6.46 x 10^-6 +6.46 x 10^-6 Kb = {6.46 x 10^-6)^2 / 0.1 = 4...
July 26, 2009

Chem
wait I want to correct myself. I think I would subtract 8.81 from 14 to get the POH and then figure out the concentration of OH. Is this correct?
July 26, 2009

Chem
Thanks :) I did the ice table but I don't know what to do from there. They haven't given me the Kb value so how do I find x? Or do I find the concentration of H+ from ph= -log[h+] and then divide it by 1 x 10^-14 to find the concentration on OH in the ice table?
July 26, 2009

Chem
Does the R just represent a chain?
July 26, 2009

Chem
I need to find the Kb of Analine. I've been told the ph is 8.81 and that the concentration of the solution is 0.1 mol/L. What would be the equation I'm working with :S ?
July 26, 2009

Chem
Thanks :)
July 26, 2009

Chem
That dosent seem to work out :S Everyone says that the best treatment is putting a 100% oxygen mask on the person. Why do that?
July 26, 2009

Chem
When you have carbon monoxide poisoning and you put on a 100% oxygen mask, will the CO react with the O to make CO2 which the body will exhale?
July 26, 2009

Chem
This is what I think. When we breath in oxygenm we breath out carbon dioxide. The carbon dioxide reacts with the lithium oxide and continues to produce h2o and li2co3. if they keep releasing carbondioxide, they'll keep producing li2co3 and h20. I don't exactly see ...
July 25, 2009

Chem
An air purifiction system involving litium hydroxide, LiOH, was used. LiOH absorbs carbon dioxide. 2LiOH(s) + CO2(g) <---> Li2CO3(s) + H2O(l) Use Le Chatelier's principle to explain why the amount of time astronauts can spend in a space-craft is limited?
July 25, 2009

CHEM
Thanks :)
July 24, 2009

CHEM
A concentrated weak acid is best described as which of the following? (a) a solution with a high pH (b) a solution where the concentration of undissociated acid particles is high and relative quantity of hydronium ions is low (c) a solution where the concentration of ...
July 24, 2009

chem
Thanks a lot Dr Bob :)
July 24, 2009

chem
NH4Br has been dissolved into 1 L of water at 25 degrees celcius. the solution has a pH of 5.16. calculate number of grams of NH4Br. I dont even know how to write the equation for this. Could someone please write the water + NH4 equation for me. Thanks :)
July 24, 2009

chem
I redid it and I got 11.25 :) Thanks :)
July 24, 2009

chem
Calculate the pH of 0.20 M NaCN solution. NaCN ---> Na+ + CN- CN- + H20+ ---> HCN+ + OH- Initial conc. of CN- = 0.20 mol/L change = -x equillibrium = 0.20-x HCN equill. = +x OH equill. = 1x10^-7+x Ka= 6.2 x 10^-10 Kb = KW/Ka = 1x10^-14/6n2 x 10^-10 = 1.6 x 10^-5 1.6 x 10...
July 24, 2009

Chem
I understand now. Thank you :)
July 23, 2009

Chem
I dont understand how to figure out the equation. I thought it would be this: CH3NH2 + HOH ==> CH3NH+ + H30 :S How do I know what the products will be?
July 23, 2009

Chem
Methylaime, CH3NH2. If a 0.100 mol/L solution of methyamine has a pH of 11.80, calculate the ionization constant for the weak base. What is an ionization constant. Is it just K? This is what I did so far: 11.80 = -log (concentration of h3o+) 10^-11.80 = (concentration of h3o...
July 23, 2009

chem
Yes I figured out that problem. :) Thanks a lot!
July 23, 2009

chem
Do we always have to do an ICE table for weak acids and bases?
July 23, 2009

chem
Calculate the [h3o+] and [oh-], pH and the percent dissociation for both 0.25 mol/L HCl and 0.25 mol/L HCN. 0.25 mol/L HCL [H+] = 0.25 mol/L [OH-] = 1 x 10^-14 / 0.25 = 4 x 10^-14 pH = 0.60 % dissociation = ? ( I dont know how to figure out percent dissociation) For the HCN I ...
July 23, 2009

Chem
We weren't given the molarity of Ca(OH)2, thats why I dont understand how to do the question.
July 22, 2009

Chem
but M is in grams/mol.d When I said M I meant molar mass not molarity.
July 22, 2009

Chem
I did an experiment were I added some water and KHP into a beaker and phenophalene [sp?]. It was a titration lab. We slowly added calciuum hydroxide into the beaker and waited till the solution turned into a faint pink. The question is asking me to find the number of mols of ...
July 22, 2009

Chem
If I were to use dichromate and add HCL and Ba(NO3)2 and NaOH , what should form? Im thinking the Ba(NO3)2 would still form a precipitate but im not too sure about everything else
July 22, 2009

Chem
Thank You :D
July 22, 2009

Chem
sorry about the re-post it was an accident
July 22, 2009

Chem
If I were to use dichromate and add HCL and Ba(NO3)2 and NaOH , what should form? Im thinking the Ba(NO3)2 would still form a precipitate but im not too sure about everything else
July 22, 2009

chemisty
Thanks :)
July 22, 2009

chemisty
oops sorry :S I meant Cromate. Potassium Dichromate. In a lab that I did I mixed 0.1 M K2CrO4 with 2 drops of NaOH and I added Ba(NO)2 until I noticed a color change. When I did this, the K2CrO4 which was initally yellow formed a white precipitate and on the top there was ...
July 22, 2009

chemisty
What would happen if you reacted potassium dicarbonate with HCL and NaOH?
July 22, 2009

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