Chemistry 101

last SG · 2005-11-12T01:56:23+00:00

I know you gonna get mad with me but why will that produce that energy ( not force but energy) ?

The return SG

Calling all chemistry experts to answer a mystery which I don't know the answer:

Look at the atom, where all the positive-charged protons are joined to form the nucleus. I do not know what keeps these protons together.

The return SG

No experts here? Rolling Eyes

Realistic-Nonsense SG

cricket sounds

ditzy SG

*hooting owl* Laughing

The return SG

If anyone knows or have found an answer to it from the net which I can't find, please post it up here.

Thanks. Very Happy

The return SG

Why ?

The return SG

Why ?

Realistic-Nonsense SG

*hooting owls*

deathscythe99 SG

U want what level type of answer?

University? JC? Sec sch? Pri sch? Laughing

First up, there's nuclear binding energy, as well as electrostatic forces.

The return SG

Laughing Rolling Eyes

The return SG

Why is that so? Why?

The return SG

Where does the nuclear binding energy, as well as electrostatic forces comes from? I can't figure it out.

The return SG

*cricket sounds* Rolling Eyes

kaobeikaobu SG

mosquito sounds

The return SG

I google and found this:

Most of us know that opposite charges attract and that like charges repel. From the start it might seem that the nucleus of the atom might have problems with stability since there are all these positively charged protons. What is it that keeps the nucleus from flying apart. Many think that neutrons help to keep the nucleus together by providing a nuclear force that is able to keep the protons and neutrons together in the nucleus. Without the neutrons, the positive charged protons would cause a repulsion force that would result in the nucleus flying apart.

For small nuclides it takes approximately equal numbers of neutrons and protons for it to be stable. Apparently, having too many neutrons is just as unstable as not having enough neutrons. When we look at larger and larger nuclides having more and more positive charge within the nucleus, we see that a higher percentage of neutrons are needed. Finally, there comes a point where no amount of neutrons can make the nuclide stable. There are just too many positive charges.

Nuclear Binding Energy

So the nucleus is held together by very strong forces called nuclear binding energy, however we do not understand the nature of this force. But we do know that enormous amounts of energy are needed to separate the nucleus into separate protons and neutrons.

From the article, it sugguest that Nuclear Binding Energy keeps the nucleus together but I still can't figure out where did this nuclear binding energy comes from when neutrons << protons. It is a mystery as to where this msyterious enregy comes from leh.

Anyone knows the answer, please post leh.

Thanks thanks.

The return SG

And this also leads me to think what holds the whole universe together.

Experts come in and help leh.

deathscythe99 SG

What holds the whole universe together?

Well...talk about g-forces by each object acting on each other.

But well, the universe is expanding, and not in steady state...so.... Laughing

The return SG

I not good in that areas. But I doubt your answer. Got any link to show?

the g-forces is gravititational forces?

shadowlunar SG

Found this on the Net.

In physics, the proton (Greek proton = first) is a subatomic particle with an electric charge of one positive fundamental unit (1.602 × 10−19 coulomb) and a mass of 938.3 MeV/c2 (1.6726 × 10−27 kg), or about 1836 times the mass of an electron. The proton is observed to be stable, with a lower limit on its half-life of about 1035 years, although some theories predict that the proton may decay. The proton and neutron are both nucleons.

The nucleus of the most common isotope of the hydrogen atom is a single proton. The nuclei of other atoms are composed of protons and neutrons held together by the strong nuclear force. The number of protons in the nucleus determines the chemical properties of the atom and which chemical element it is.

Protons are classified as baryons and are composed of two up quarks and one down quark, which are also held together by the strong nuclear force, mediated by gluons. The proton's antimatter equivalent is the antiproton, which has the same magnitude charge as the proton but the opposite sign.

In chemistry and biochemistry, the term proton may refer to the hydrogen ion, H+. In this context, a proton donor is an acid and a proton acceptor a base.

For more info, click here

deathscythe99 SG

Nuclear binding energy is the energy required to bring the constituent neutrons and protons together. The more protons u have in the entire nucleus, the more neutrons u need to stabilize it.

(Neutrons are made of protons capturing an electron BTW. Therefore, there exist interactions which it can have, mainly, electromagnetic, weak nuclear, strong nuclear and gravitational interactions)

Read here for more stuff on the atom: http://en.wikipedia.org/wiki/Atomic_nucleus

In QM model of the atom, you consider the nucleon and not the protons or neutrons. This would mean that with respect to the nucleon, u have something which has a spin and by Heisenburg's Uncertainty Principle, the smaller the vol, the greater the KE. Therefore the nucleon actually stays in shape and does not elongate or collapse.