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/sci/ Science & Math

Threads added between 2012/11/07 and 2012/11/14

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Most viewed threads in this category

4 more posts in this thread. [Missing image file: lewis.gif]
How would I draw lewis structure of [NO4]3-, with the lone pair electrons, and with the formal charges minimized? NO4 3- Have been stuck on this question for over an hour.
12 more posts in this thread. [Missing image file: woof.jpg]
Calculate the mass of H2O required to react completely with 5.0 g of SiCl4: SiCl4 + 2H2O -> SiO2 + 4HCl I saw this problem online and the answer is given, but not the steps. Anyone wanna show the steps? Here is another one which seems slightly harder, well only harder because I don't know where to start. Lead (IV) oxide reacts with concentrated hydrochloric acid as follows: PbO2(s) + 4HCl(aq) -> PbCl2(s) + Cl2(g) + 2H2O(l) What mass of lead chloride would be obtained from 37.2g of PbO2, and what mass of chlorine gas would be produced?
5 more posts in this thread. [Missing image file: serial20experiments20lain202_jpg.jpg]
So I have a Java midterm coming up and I feel really unprepared. All those days of being lazy are starting to catch up to me and I am really worried. I know that the best way to study is to do the hw and read the book, but I feel like that method might not be fast enough to prepare me for the test. are there any resources out there that can help me?
5 more posts in this thread. [Missing image file: evilteacher.png]
why THE FUCK university teachers still use powerpoint for class material, make some fucking effort i don't even want flash a simple html can be fine at least be more organized but NO the fucker has to use powerpoint because HE DOESN'T KNOW ANYTHING ELSE INVENT SOMETHINGNEW FOR FUCKS SAKE AND PUT A FUCKING TABLE OF CONTENTS IF YOU'RE DUMB ENOUGH TO CONTINUE USING POWERPOINT


2 more posts in this thread. [Missing image file: randymarsh.jpg]
does anyone have a cramster account i could use for a day? fucking physics test tomo. you'd be a life saver..

retard question, plz respond

4 more posts in this thread. [Missing image file: 1349727470436.jpg]
Lets say we have two volatile solvents. One has a %50 lower boiling point than the other, but also a %50 higher density. Would said chem take longer to evaporate because its more dense, or will it just release thicker vapor faster. What if any is the correlation between these factors.
9 more posts in this thread. [Missing image file: degrad.gif]
What does cosine pair 80 degrees with and how do you find it without a calculator?


12 more posts in this thread. [Missing image file: 1350826523001.jpg]
If birds evolved from dinosaurs why aren't they cold blooded? [spoiler] i'm not sayin evolution isn't correct, it's a genuine inquiry.
78 more posts in this thread. [Missing image file: 1347048610786763.jpg]
I don't want to die. That is, I don't want to die ever. I have such a huge fear of death it's pathetic. The thought of not being able to think, see or feel, of the fact that my life will one day be done and all that I've achieved and created will be given an ending, that this curve of bettering myself and becoming wiser will end. I feel like it's going to cut everything short, that if I was given more time I could reach something that I can't within one human life, this is really hard to describe but that's how I feel. Thinking of myself as an old man witnessing my own body slowly breaking down, noticing my own mind starting to falter, knowing that my life will be over within a few years sounds so scary it hurts. What are the chances that within the next 60 or so years the technology to transfer our consciousness or repairing our body indefinitely will be available? If not, how soon would it, if ever? Im seriously considering cryogenetic storage or whatever it is called to try cheat death.


3 more posts in this thread. [Missing image file: tech-desktop-backgrounds-4.jpg]
I'm sure this has already been done, but what is 0/0? I personally think that it can equal any real number, but some people would say it's 1 or 0 ect. Pic unrelated

Black holes

16 more posts in this thread. [Missing image file: hole.png]
Hey /sci/, Layman here, What do you suppose were to happen if a black hole came into contact with another black hole?
6 more posts in this thread. [Missing image file: top-10-james-bond-movies_flash.jpg]
James Bond has a 1st in oriental languages he got from Cambridge in stead of STEM. Would you tell James Bond he has a useless degree?
22 more posts in this thread. [Missing image file: 2nd Grade Math.png]
EXAMPLE: 1000 - 23 I forgot all my math from before 2nd grade. Show me how to solve. I know the answer, but I need to know how to solve by hand. Why is life so hard?
5 more posts in this thread. [Missing image file: Coulomb.jpg]
Hi, I have a math question for you. Cant understand how to begin to solve this.. ''Electrolysis of aluminum takes 40 million coulombs to draw out 3.7kg Al. What must the current be to do it in A one minute and B one hour?'' Is this question impossible to solve due to lack of other factors?? it is a total mindfuck for me. I know that 1c = 1 ampere per second.. Can anyone please help?
11 more posts in this thread. [Missing image file: 3-1213191960-me-thinking-hard-about(...).jpg]
Hi /sci/ (picture not related) So i was thinking how many amazing things one simple cell can do with some time. But then a question poped out in my head. Were did the first cell come from? anyone got a clue?
27 more posts in this thread. [Missing image file: weierstrass.gif]
Hi guys, I have a math problem for you. I was unable to solve it, and the submission deadline has already passed (this is for a Calc I class), meaning I won't get credit for it - so don't worry. The professor won't point me in the right direction, and I do want to know the answer as it's the only special problem I couldn't solve. Here goes. Find a real-valued function, f, with domain [0,1] such that: - f(0) < f(1) - f is continuous - For all a and b, where 0 < a < b < 1, f is not increasing on [a, b].
3 more posts in this thread. [Missing image file: 3.gif]
I once failed a course. 50% of the grade from cases counted for 5.8 out of 10. the other 50% test grade counted for 4.5 out of 10. the average was 5.2 out of 10 rounded up. (needs 5.5 to pass) I follow the same course this semester however the grading has changed. 20% of the grade from cases 80% of the grade now counts for the test. Imagine in this new situation i would not do the test(unwise) and my test average remains a 4.5, what grade do i need for the other 20% as to reach the same insufficient grade of 5.2 on average?
16 more posts in this thread. [Missing image file: fishy.jpg]
Why vaginas smell like fish?
30 more posts in this thread. [Missing image file: first uzi.jpg]
What have you archieved in life? Will you be remembered? Please tell me I am curious will share own stories later. (pic unrelated)
3 more posts in this thread. [Missing image file: 1346758070449.jpg]
/sci/entists with experience in MORSE CODE Recently, I've gotten a job teaching undergrads Radio Communications. We start off with the old forms of communication. So I have to teach them Morse Code. I still have to learn Morse myself so I don't know how to teach my students. We will cover morse code in the next 2 weeks, 5 4-hour meetings. This includes lecture and lab. How does this sound: Day 1: Intro Lecture; Lab, memorize and transmit the DOT branches (next week) Day 2: 1 hour Lecture; Lab, memorize and transmit the DASH branches Day 3: 1 hour Lecture; Lab, transmit and receive messages (next next week) Day 4: Lab; transmit/receive with a partner using sound Day 5: Lab; transmit/receive with a partner using light Is this realistic? effective?

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