Friday
July 25, 2014

Posts by lena


Total # Posts: 1,000

Chem
Is a C-H bond polar or non-polar? Is a C-Cl bond polar or non-polar? I have different sources giving me different ranges. One says that anything with an electronegetivity of 0.5 or less is non-polar and I have anothre source saying anything 0.3 and less is non-polar. Which one...

chem
Thank you :)

chem
what does the delta mean?

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 ...

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...

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)?

Chem
Thank you :)

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.

Chem
Thank you :)

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?

Chem
I finally understand it. Thank you so much!

Chem
When I said below I meant on the actually forum; the previous question I posted.

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

Chem
when I said configuration I meant electron configuration

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

Chem
Thank you so much :)

Chem
So we are following the Aufbau Principle?

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?

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?

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

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

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?

Chem
Thanks :)

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

Chem
Thank you so much :)

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?

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 f...

Chem
I did make a mistake on my calculator. Thanks a lot :)

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 = 0.448/0.0160229...

Chem
Thanks :D

Chem
Thanks a lot DrBob :)

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?...

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

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 ?

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

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 di...

Chem
Ohh.. thank you :)

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.

Chem
Thank you :)

Chem
superscript:226 element:Z subscript:29 Whats does the subscript and superscript represent?

Chem
Thanks :)

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

Science/Careers
OK. Thank you soo much.

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 s...

Careers/Science
Thank you :)

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?

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

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?

English
thanks :)

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

v-t graph
is the slope of a p-t graph the velocity?

v-t graph
how do you convert a p-t graph into a v-t graph?

Greek Origins
Thank you sooo much!

Greek Origins
so Dies means time of light?

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

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 :(

Math
planned to hatch 20 chicks a year* CORRECTION

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 ...

Greek Origins
From where in the greek language did the word Night originate from?

Cars
What type of fuel does the cadillac cts take? premium or regular?

earth science
Thanks! This helped a lot :]

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?

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&#...

physics
Thanks :)

physics
why does the total mechanical energy on a roller coaster stay the same?

English
thanks :)

English
Would 'back uu plan' be considered slang in a formal essay?

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

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 gabard...

Opinion/English
thanks :)

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?

English
thanks :D

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 inte...

English
I meant consequently; I think that would work better.

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.

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.

Physics
Thanks :D

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

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 :(

English
Would it be a bad idea to start a concluding paragraph with hence?

English
Thanks Writeacher and Ms. Sue :)

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

English
How would I describe vanity as a verb. He is being ________.

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 downfal...

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.

English
Ok thanks :D

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.

Oh Brother Where Art Thou?
Thanks :)

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

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?

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?

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)

English
Thanks

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...

English
Thanks

English
How does vanity bring forth someones downfall?

English
Thanks :)

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.

English
Thanks :D

English
What is the ability called? Like the ability to see into the future?

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