peace

ok guys, i swear to god on my nonexistent penis that this will be the last time i post homework problems on TL:

Im doing this chemistry lab and i have two questions i dont understand:

1. When a solid such as NaOH dissolves in water, heat is either created or absorbed, and can be calculated using the formula q = mc(delta)T. My question is, is the mass used in the calculation JUST the mass of the water? or the mass of the solid? or the total mass of both?

2. In another scenario, lets say i mix hydrochloric acid and sodium hydroxide solutions together, and calculate heat change using q= mc (delta)T, does the mass include the mass of the hydrochloric acid? or the mass of the sodium hydroxide? or both??

Thanks =)

Hi guys:

I have a math problem i need to solve, although it sounds easy but i just can't get the answer, can someone help me out?

Find the equation of the tangent line of y = x+3 (whole thing squared rooted) at point (6,3).

Please don't use derivatives to solve it. Thank you.=)

Hi guys, as a continuation from the last post, I firstly want to thank you all for helping me out. But apparently due to the inability of my chemistry teacher to teach, i have a few additional questions that i hope you guys can help you answer.

Right now I'm studying electron configuration, and learning how to write elements using the 4 quantum numbers: n, L, ml, and ms. Plz refer to the below link for a moment:

http://images.google.ca/imgres?imgurl...p%3D18%26um%3D1%26hl%3Dzh-CN%26sa%3DN

The shape of the orbitals of electrons are s, p, d, f, and so on. I know that at the first energy level, n = 1, thus L = 0, which means the shape of the orbital is "s" capable of holding 2 electrons in a spherical shape.

When n = 2, L = 0 and 1, which means the orbitals at that energy level are in the shape of "s" and also "p". "s" can hold 2 electrons while "p" can hold 6, for a total of 8. But here comes my first question: do the orbitals "s" and "p" BOTH exist at the second energy level when n = 2, while the orbital at the first energy level "s" is separate from the orbitals in the second energy level?

*In addition, in my chemistry notes the terms px, py, pz are also used. Do all three terms represent ONE "p" orbital?

When n = 3, L = 0, 1, and 2. Which means the orbitals are "s", "p", and "d". "s" and "p" together can hold a total of 8 electrons. However, "d" supposedly can hold 10 electrons, and according to the link, the orbital "d" include 5 different orientations based on different x-y-z axises. My second question is, do all FIVE shapes exist together as the energy level "d"? If so, a total of 10 electrons in 5 orientations mean that each orientation can hold 2 electrons. How come there are 4 circles in each orientation then?

Lastly, ml is the magnetic quantum number, which can equal to -L .... 0 ..... + L, and it tells you the spatial orientation of the orbital, whether its along the x-axis, y- axis, or z-axis. Which value of ml corresponds with each orientation??

When it comes to the ms, which is the spin quantum number that tells the direction of spin of the electrons, for each orientation, DO I have to assign the positive 1/2 for the first electron first? Or does it not matter?

Thank you for your time.

Hi guys, I'm taking grade 12 chemistry right now and the teacher started with the introduction to Atomic Theory and its development. After thinking about all the stuff being taught, I am confused about certain concepts, and the teacher won't explain properly, hope someone can help me out.

The one big problem i have is that: we all know that the atom is made up of a nucleus and orbiting electrons. When an object is heated, it emits light. So according to my notes, it says that although electrons are orbiting around the nucleus and accelerating (change in direction because of its circular motion), and since its been scientifically proven that acceleration produce some type of light, the orbiting electrons would emit photons of electromagnetic radiation and lose energy, so theoretically they would crash into the nucleus.

So Bohr concluded that electrons have specific energy levels (electron shells), and if atoms absorb energy, the electrons will get excited and jump to a higher energy level, and when it returns to its "ground" position, the energy is released in the form of light.

The energy of a given energy level is determined by the following equation:

E = - R / n^2 ( where R is a constant of 2.18 x 10^-18 J, and "n" is the energy level/electron shell)

Here comes my problem, let's say I have a hydrogen atom (cuz its easy), its valence electrons are in n = 1 energy level. So if you plug it into the equation, you get a negative value. But the thing is, how can energy be negative?? or did i misinterpret the equation in some way?

ALso, it says that the energy of electron bound to the nucleus is lower than if the electron were at infinity, which imo makes sense. But next thing it says is that as n approaches infinity, Energy approaches ZERO. But how can that be? If n increases, doesn't energy also increase? so instead of the energy approaching zero, shouldn't it also approach infinity?

Hope you guys can help me out a little

I'm doing this monstrous paper filled with hardcore physics problems and I'm having a bit of difficulty, hope you guys can help me out:

Two questions:
1) An airplane wishes to fly from Toronto to Ottawa. Toronto is a distance of 320 km S40W from Ottawa. If the plane can fly with airspeed of 600 km/hr and there has been a wind speed of 75 km/hr coming from the southwest measured by the weather network. What is the direction the plane should point from T.O to arrive in Ottawa, and how long will it take?

2) An airplane is flying in a horizontal circle at a speed of 480 km/h. If the wings are tilted 40 degrees from the horizontal, what is the radius of the circle in which the plane is flying? Assume that the force opposing gravity to keep the plane in the air is horizontal lift which exactly balances the force of gravity when the plane is flying straight.

Thanks

ok guys, I'm going into grade 12, and right now i'm shitting my pants. So during the summer break I'm like fuck this shit i'm gonna take some courses to prepare myself for grade 12. So so far i am taking advance functions and grade 12 physics, physics is ok, but omfg im almost done advance functions and starting calculus, i'm so fucking scared. My teacher likes to show off so he wrote some shit about derivatives and limits on the board in our advance functions class, and i'm kinda scared of calculus now. People say its a hardcore subject, and to be honest i am a very competitive person who has always been achieving high marks in math during all the high school years. So my problem is, for those of you who taken calculus before, is it really really that challenging? If you have some advice or tips for me, they will be appreciated. =D

Hello my TL buddies *bows
Sry but I just drank a lot of coke so excuse me for being a bit high right now, but can you guys translate the sentence below for me, its in korean:

상처가 병이 돼서. 모든 문이 벽이 돼서. 아.프.죠?

Thank you much appreciated guys =D

Poll: Would you rather be a manly woman or womanly man?
(Vote): Manly Woman
(Vote): Womanly Man
(Vote): Both
(Vote): Half a vagina half penis

개구리아..보고싶어..

My brother and I:

December 20th, 1991.
June 6, 1992.
Before then, it was six months apart.
Now, it’s half a globe apart.

The first game we ever played together was Raiden. I vividly remember that every time we sat in front of our computer in our little room, you would hold down the Ctrl key to fire, while I maneuver the direction arrow keys to play. It was a challenging game, yet to our childish minds back then, we thought it was one of the best games ever to be created. Maybe it was the game design of the Spaceships and bombs, or it could be us, trying to enjoy our childhood in the presence of the other. I never had the time to ask you, nor will we ever play that game again.

Our first crush, was in junior school. How foolish we were, not knowing the true capacity and meaning of love. But we both dedicated ourselves to that same girl. You would bring smiles onto her face, and I would bring flowers for her during our lunch break. It was like a silent but brotherly combat. Those lovely days just flew past the both of us, and before we knew it, young love withered away.

We were inseparable.
“Hey you dumb kids! Those are my seats!”
I would jump in front of you:
“You pick on or lift a finger on my brother, and I’ll kill you.”
“Thanks bro.” Then you would jog off to buy me McDonald’s.

“Hey kid! Why don’t you give us your lunch?”
“Oh yeah? Well, my brother’s Han, so unless you want to get hurt, I say you give me your lunch!”

Foolish brother, you and your empty threats. Just because I was the fastest runner in the school, doesn’t mean I pack the hardest punch. But every time you would proudly tell me these stories, and then you would hug me, and run off to flirt with girls. To leave me there, with a big cocky grin on my face. At that time, and even to this day, I never knew there is one person in this world who would appreciate me the way you did. Unknowingly, you encouraged me to become the best. In order to make you proud of your big brother, I worked and worked, and when I reached that great height and looked down to everyone else, I realized that I’ve left you behind.

Such little things are such significant impacts on my life. To be the best, is to endure the fear of failure. You taught me that, and you understood me the most. Geniuses, who are the best of the best, are destined to be lonely. To this day, I wish I could have cherished those moments with you, because you proved them wrong.

That moment on, I lived in constant fear. As I struggled to remain at the top, I would come home, with anguish and hatred filled in my heart, everyday. I shut myself down, and I talked less and less. Yet you understood. Without any exchange of words, you would glance at me, and when I look back, you would smile, and put a glass of Ice Tea on my desk amongst those crumpled pieces of paper filled with mathematic equations and class notes. Then you would sit yourself down on a cushion below my feet with a laptop on your lap, and accompany me through those dark nights of our childhood. I never spoke much, and occasionally sighed with frustration and tiredness. You never complained about the loneliness you went through, instead you would just sit there, with your kind and tearful eyes blinking at my distorted face, like you are crying out for me, crying for me to return, crying for me to become the brother I used to be.

So those years went past, and you were not only my brother, but my companion, my secret-keeper, my mentor. You taught me so many things in your small ways. We would walk on the dirty street during the hot summer, and you would take out your wallet, take out a five dollar bill, drop on your knees, and put it in the bowl of a hobo. Then you would smile at the nod of gratitude, and humbly walk away.

“Life is about living to your fullest, and dedicate your happiness to the people whom you care about.”

“No. Life is about becoming the best. Only when you become the best, will people admire you and look up to you. Only when you are successful, can you live a happy life.”

“I disagree. Friends and family are more important than money. If I were to fail miserably in life, if I am not rich, if I’m not successful, as long as I have friends and family, I can find happiness.”

That was the argument we always had, and it usually ended up in my abrupt silence or my storming of frustration and anger. At that time, I became angry at you, because I was selfish. Yet you never seem to mind. You would just tap me on the shoulder, and whisper: “I’m sorry.”

November 30, 2000. A stormy night at the airport signified our farewell. You didn’t shed a tear, because you knew that it would make me call you a “wuss” again. You just hugged me tightly, because you knew that your brother is on his way to a new journey without you.

“Life will be tough for you in a foreign country. But work hard, and become the best! And I hope, that one day, you will find that someone, whom you can love with your whole heart, and share your happiness with.”

That was the last thing you said to me. As I got past the end of that barrier, I looked back at your tiny figure. Tears filled my heart. 10 years of brotherhood, 10 years of companionship, and now I’m embarked on a journey without him, without the one person who understood me the most, without the one person who understood my pain, and the only person who appreciated my existence.

“Goodbye.” Was all I could manage. So many things left unsaid.

“I wasn’t planning to call you a wuss…”
*****

These memories have accompanied me for three years now.

I’m in Canada, you are in China. We are half a world away. Now that you are busy with your everyday life and me with mine, the distance between us became wider as we lost all contact with one another.

But every time I submerge into darkness, I remember your little ways:

“Life is about living to your fullest, and dedicate your happiness to the people whom you care about.”

To this day, the only person who understood my pain, the only person to accompany me through the darkest years of my life, the only person who uses the silence between us to motivate and encourage me….

His name is Conan.