Friday
August 22, 2014

Posts by lena


Total # Posts: 995

chem
what does the delta mean?
July 8, 2009

chem
U have to show the partial charges and bond dipoles on my ;lewis structure of CH3Cl For the partial charges would I just have a negetive sign as the superscript of Cl and a positive sign and the superscript of C ? What exactly must I do to show bond dipoles? I didn't know ...
July 8, 2009

Chem
When you said "While a physical appearance of an element makes it easier to explain to beginning students the how and why of chemical reactions," do you mean there are rules set in place and exceptions but they aren't explained; as students we just accept them as...
July 7, 2009

Chem
What are some pros and cons for energy level diagrams and electron configuration diagrams? I was very long for elements like uranium and such but im not sure if those are the types of answers im supposed to be giving. Are there any flaws in the two methods (obvious con)?
July 7, 2009

Chem
Thank you :)
July 7, 2009

Chem
Is this a possible quantum number: 3,2,2,-1/2 This is my thikning: n=3 so therefore l = 0-2 so therefore ml could = 2 However, many of my classmates said it was impossible.
July 7, 2009

Chem
Thank you :)
July 7, 2009

Chem
What 4 quantum numbers describes one of the outermost electrons in a strontium atom in ground state? 5,0,0,1/2 Is my answer correct?
July 7, 2009

Chem
I finally understand it. Thank you so much!
July 7, 2009

Chem
When I said below I meant on the actually forum; the previous question I posted.
July 7, 2009

Chem
Thank you :) Could you also please answer the question below? I still don't understand it.
July 7, 2009

Chem
when I said configuration I meant electron configuration
July 7, 2009

Chem
Theres this one question in my homework that says that there is an unusual but actual condensed configuration and they said to write it. Which element are they referring to? :S
July 7, 2009

Chem
Thank you so much :)
July 7, 2009

Chem
So we are following the Aufbau Principle?
July 7, 2009

Chem
"But the half filled rule, and the one you apparently used to fill the s half way and the p orbitals half way, ARE FOR THE SAME ORBITAL" So the 2S and 2P are both in the second orbital so therefore there is no electron promotion?
July 7, 2009

Chem
My teacher was saying that its better for the shells to be half full rather than one being completely full and the other being not half full. He was referring to Hund's law. What do you think about this?
July 7, 2009

Chem
I was asked to fraw the energy level diagram for carbon. Carbon has 6 electrons so would the 2s and 2p orbitals both be half full? 1s = 2 electrons 2s= 1 electron 2p = 3 electrons
July 7, 2009

Chem
Ohhh.. OK. I understand. Thank you soo much for all your help today :)
July 6, 2009

Chem
A -> 3C The molar mass of A is 10.0g/mol If 2.0 grams of A reacts, how many moles of C will be produced? A -------------------> 3C m.mass= 10.0g/mol mass = 2.0 g moles = 2.0 g/10.0 g/mol =0.2 mol moles of c = 3 x 0.2 = 0.6 mol Did I do this correctly?
July 6, 2009

Chem
Thanks :)
July 6, 2009

Chem
Are the followinf true: atomic radii decreases from left to right, across a row atomic radii increases from top to bottom of a column
July 6, 2009

Chem
Thank you so much :)
July 6, 2009

Chem
mass = 4.550 g molar mass = 142.05 g/mol n= 0.032030975 mol c= 0.032030975/0.125 = 0.256 mol/L would I have 3 or 4 sig. digs? cause when I converted 125.0mL into 0.125 L I lost a sig dig;or should it be 0.1250 L?
July 6, 2009

Chem
As a part of a study to see whther just the chloride ion on NaCl accelerates the rusting of iron, a student decided to see whtjer iron rusted in a solution on Na2SO4. The solution was made by dissolving 4.550 g of Na2SO4 in water using 125.0 mL volumetric flask to adjust the ...
July 6, 2009

Chem
I did make a mistake on my calculator. Thanks a lot :)
July 6, 2009

Chem
volume = 322 mL temperature = 150 celcius pressure = 175 kPa mass = 0.448 Calculate the molar mass of the gas. First I converted volume to 0.332 L. Second I converted 150 celcius into 423 kelvin. PV = nRt (175)(0.322) = n(8.314)(423) n= 0.016022988 molar mass = 0.448/0....
July 6, 2009

Chem
Thanks :D
July 6, 2009

Chem
Thanks a lot DrBob :)
July 6, 2009

Chem
A tank car containing concentrated HCL (molarity 12.1) derails and spills exactly 1500 L of acid. Solid potassium hydroxide is required ot neutralize the spill. (a) Write a balanced chemical equation. HCl + KOH -> kCl + H2O (b) What is the molar ratio between acid and base...
July 6, 2009

Chem
I think I understand it now. They also said at STP. I didn't notice that at first. Thanks :)
July 6, 2009

Chem
One of my questions asks me to find the volume of neon gas. I thought neon didn't attach with other atoms because it had a full valence shell, how would it form into a gas? What would the formula be? N2, N3 ?
July 6, 2009

Chem
Thank you :) If I would have had something like 2.4 would I round it to 2 because of significant digits?
July 6, 2009

Chem
How many moles of hydrogen and oxygen are in 2 moles of water? water: h2o # of molecules = (6.022 x 10^23)(2)= 1.2044 x 10^23 # of hydrogen atoms = (1.2044 x 10^23)(2)= 2.4088 x 10^24 # of oxygen atoms = 1.2044 x 10^24 Did I do this correctly? What do I do about significant ...
July 6, 2009

Chem
Ohh.. thank you :)
July 6, 2009

Chem
Hg(CN) I don't know how to name this. I know that Hg is mercury and C is carbon and N is nitrogen.
July 6, 2009

Chem
Thank you :)
July 6, 2009

Chem
superscript:226 element:Z subscript:29 Whats does the subscript and superscript represent?
July 6, 2009

Chem
Thanks :)
July 6, 2009

Chem
Does electron affintity increase from left to right on the periodic table? And are there any trends for the groups?
July 6, 2009

Science/Careers
OK. Thank you soo much.
July 5, 2009

Science/Careers
I wanted to know how universities look at summer school courses. My guidance counseller told me that it dosen't matter whether the course you take is in (normal)school or summer school but others are saying that some universities dont accept it. Im taking a core grade 12 ...
July 5, 2009

Careers/Science
Thank you :)
July 5, 2009

Careers/Science
How long in the undergraduate program to get into PharmD? And are there any school thats allow you to go right into PharmD from highschool?
July 5, 2009

Careers/Science
After the PharmD program are you officially a pharmacist or is there more education you have to go through?
July 5, 2009

Math
We're learning something about transformations on the exponents of a function. For exmaple 2^x becomes 2^4(x-2)+2. Would this mean that the 2^x graph stretched vertically by a factor of 4, moved two units to the right and 2 units downwards?
June 19, 2009

English
thanks :)
June 18, 2009

English
Whats that word that means like twisting a story; like making it more exciting than it is; something like that.
June 18, 2009

v-t graph
is the slope of a p-t graph the velocity?
June 17, 2009

v-t graph
how do you convert a p-t graph into a v-t graph?
June 17, 2009

Greek Origins
Thank you sooo much!
June 9, 2009

Greek Origins
so Dies means time of light?
June 9, 2009

Greek Origins
Is there any word originated from greek that means something like day; I need something that symbolizes a time of light.
June 9, 2009

Greek Origins
From what greek word did the word 'day' originate from (day as in a day of the week)? and what does that greek word mean in greek? I`ve been searching around and I havent found anything :(
June 9, 2009

Math
planned to hatch 20 chicks a year* CORRECTION
June 7, 2009

Math
I don't think I am understanding this question. Question: A zoo started with 16 cranes and panned to hatch 20 chicks. A few birds were kept for breeding and the rest realeased into the wild. At the end of last year, a total of 136 cranes had spent some time in the zoo. If ...
June 7, 2009

Greek Origins
From where in the greek language did the word Night originate from?
June 5, 2009

Cars
What type of fuel does the cadillac cts take? premium or regular?
May 25, 2009

earth science
Thanks! This helped a lot :]
May 21, 2009

earth science
if the planet is really small [compared to others, like Pluto], does that mean it has no gravity? like, would you fly on Pluto because it's gravitational pull isn't as strong?
May 21, 2009

phsyics
I was wondering what the difference in current would be in one full extension cord versus several extension cords (which equal the same length as the first) attatched together? I was thinking there would be more resistance when the current goes from one cord to another but I&#...
May 11, 2009

physics
Thanks :)
May 7, 2009

physics
why does the total mechanical energy on a roller coaster stay the same?
May 7, 2009

English
thanks :)
May 6, 2009

English
Would 'back uu plan' be considered slang in a formal essay?
May 6, 2009

Shakespeare
Are ellpises allowded to be used in Shakspeare's quotes? I looked on google I can't find anything that talks about ellipses in realtion to Shakspeare's quotes :S
May 6, 2009

Shakespeare
How would I use ellipses in Shakspearean quotes? I know that after every line you put a / but I want to omit like half a speech and get to the end. How would I do this? This is what I want to use: “You call me misbeliever, cutthroat dog/ And you spit upon my Jewish ...
May 6, 2009

Opinion/English
thanks :)
May 6, 2009

Opinion/English
I talked about how love impairs the mind and doesn't allow much to make correct judgement. Are there any other disadvantages to love which may end up hurting the person in love?
May 6, 2009

English
thanks :D
May 6, 2009

English
I don't know if "For one thing would work" because my line is "when the hero falls in love, he loses all sense of logic and probability. " and my intro ends with "Lastly, when the hero easily trusts the intentions of others, as well as his own ...
May 6, 2009

English
I meant consequently; I think that would work better.
May 6, 2009

English
I was thinking of using subsequently at the beginning of my paragraph but im not too sure if that'll work. My teacher is really picky about these things and Im not sure if it MUST be a sentance.
May 6, 2009

English
I have three arguments in my introduction and I need a transitition to my first paragraph which is my first argument. I'm not too sure how to write a transistion sentance.
May 6, 2009

Physics
Thanks :D
May 4, 2009

Physics
What are some of the safety considerations and technologies used in designing a safe roller coaster ride?
May 4, 2009

English
Hmmmm, I was thinking "In conclusion" but several websites said that it's obvious if you're concluding a paragraph and that stating so would be an annoyance. I'm not too sure how to end it now :(
May 4, 2009

English
Would it be a bad idea to start a concluding paragraph with hence?
May 4, 2009

English
Thanks Writeacher and Ms. Sue :)
May 4, 2009

English
I looked up vain and it said that it means worthless. I dont understand how that is related to vanity.
May 4, 2009

English
How would I describe vanity as a verb. He is being ________.
May 4, 2009

English
One of the points said to relate your first paragraph to the thesis but I have three paragraphs with three different arguments. THESIS:The unhealable wound inevitably brings forth the hero's downfall during his journey. Arguments: - love brings forth the hero's ...
May 4, 2009

English
In my concluding paragraph of my essay I was thinking of doing this: In conclusion, it is evident that THESIS. I don't really know what to say after I've restated my thesis.
May 4, 2009

English
Ok thanks :D
May 4, 2009

English
I need to show proof in my essay as quote but would it be ok if I said something like "as illustrated" and not a direct quote because I am trying to show an action.
May 4, 2009

Oh Brother Where Art Thou?
Thanks :)
May 4, 2009

Oh Brother Where Art Thou?
Is there a quote from the movie which states that Ulysses was desired because I need proof D:
May 4, 2009

Oh Brother Where Art Thou?
To be quite honest I'm not too sure how that ties in with vanity :S Could it be that he often boasts about his intelligence and then he loses his friend Pete because of the Sirens?
May 4, 2009

Oh Brother Where Art Thou?
I recall that scene but wasn't it Pete who wanted Ulysses to stop the car in order to see the Sirens?
May 4, 2009

Oh Brother Where Art Thou?
In the film, Oh Brother Where Art Thou?, it is seen that Ulysses Everett is very self-conscious about the way his hair looks. This display vanity. Is there any different situation in the film in which Ulysses is vain? (his vanity must ultimetly bring forth his downfall)
May 4, 2009

English
Thanks
May 4, 2009

English
I've completed all my body paragraphs and now I need to write my conclusion. However, I do not know how to start my conclusion. Several sights have said that I should start by restating the thesis but I think I'm missing a transistion sentance. I was thinking of saying...
May 4, 2009

English
Thanks
May 4, 2009

English
How does vanity bring forth someones downfall?
May 4, 2009

English
Thanks :)
May 3, 2009

English
How do you describe someone's personality? I need to write a very descriptive personailty on a character in a novel I am reading and all I've gotten so far is that he's brave.
May 3, 2009

English
Thanks :D
May 3, 2009

English
What is the ability called? Like the ability to see into the future?
May 3, 2009

English
There's this one term that means that a person has seen something in the future.
May 3, 2009

Psychiatrist
Thanks :)
May 3, 2009

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