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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.

Why does poop occasionally smell like sewage? Bacteria? Which products in particular are responsible for this smell? On the topic of smelling, what makes playdough smell the way it does? I recently got a copy of XCOM and it smelled just like it. I never had a game smell like that before.

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?

How well do I need to be at Calculus to succeed in ares like Graph Theory, Number Theory, and so forth?

/sci/, I require assistance as I am currently a retard. My question to you deals with net present value and present value cost, I must decide which is a better option. A: Principle Amount of $111,100,000 Interest Rate: 5.875% 20 years B. $121,000,000 rate: 6% terms: 20 I suppose my question is, which would be the better "value".

An object in motion stays in motion unless acted on by an outside force. Perpetual motion is impossible. Pick one.

its exam revision time not asking anyone to solve thisa for me just hoping you can point me in the right direction. will delete this thread after.

I need to build a Long Range Acoustic Device. Does anyone have links to resources they can share?

good evening /sci/ i want to be able to make gorgeous latex, but after a few google searches my question remains unanswered... how the fuck do i begin a latex code here? is it \ documentclass {article} \ begin {document} (without the spages after the forwardslash, of course) any help in the matter of leaving the pleb tier of latex coding would be appreciated

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

Hey /sci/, Layman here, What do you suppose were to happen if a black hole came into contact with another black hole?

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?

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?

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?

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?

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].

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?

Why vaginas smell like fish?

What have you archieved in life? Will you be remembered? Please tell me I am curious will share own stories later. (pic unrelated)

/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?