A stable nuclear fission reaction will be sustained if every fission produces one additional fission reaction.
When the Gibbs free energy for a reaction is greater than zero, the reaction is "disfavored" - won't proceed in that direction - in fact it may try go in the reverse direction if possible. When the Gibbs free energy for a reaction is less than zero, the reaction is "favored" - it should proceed as written spontaneously. When the Gibbs free energy for a reaction is exactly zero - it is in equilibrium, with the forward and back ward reactions occurring at the same rate.
Is exactly equal in magnitude
true false is not correct
A runaway chain reaction.It is called super criticality, with KEffective > 1.When one fission reaction instigates more than one or more fission reactions it is called a Chain Reaction.KEffective is the neutron multiplication factor which is an indication of whether a reaction is stable (=1), increasing (>1), or decreasing (
Neutrons in a nuclear fission chain reaction must be controlled for two reasons... First, they must be moderated, or "slowed down", to exactly the right level of energy required to sustain the reaction. This is because, initially, the neutrons are too fast to sustain the fission reaction. They must be slowed down, but not too much, otherwise the reaction will stop. Second, they must be controlled. You want the reaction to proceed at an orderly pace, at a constant rate. To do this, you need, on a statistical average, exactly one neutron to go on to fission one atom to produce one parcel of binding energy release and one neutron, to repeat without multiplying or dividing. This is what we call KEffective = 1, where the rate of reaction does not change. Moderation and control. In tight balance. Easily upset. Fortunately, when upset, the tendency is to shutdown. That is engineering safety.
To sustain a fission chain reaction, each fission reaction must result in one more fission reaction. And that one should result in one more, and so on.
Yes, temperature has an effect on the speed of the reaction. Also most chemical reactions create heat. I feel that it is not exactly correct to say that most chemical reaction create heat. That is true for exothermic reactions, which give off heat, but endothermic reactions absorb heat instead.
Not exactly, nuclear chain reactions are a series of nuclear fissions initiated by neutrons produced in a preceding fission.
Not exactly. An enzyme is a form of catalyst. Organic in nature, they can be astonishingly powerful compared to the inorganic catalysts such as platinum, nickel or water. A catalyst generally speeds up a reaction. The control of reaction speeds in the body usually involves two enzymes, one a catalyst and the other an antagonist which interferes with the function of the first one. Some form of feedback loop finely adjusts the amounts of each of these, and the balance controls the speed of the reaction.
You're looking at a fire triangle. Fire refers to an ignition source, a spark, or similar which will cause the combustion reaction to begin. Fuel refers to the object which will be burned in the reaction. Oxygen is, exactly what it says, Oxygen. Which is required for combustion reactions.
Yes. They speed up a reaction without being consumed in it.
The amount of energy that is lost or gained by the products during the reaction.
When the Gibbs free energy for a reaction is greater than zero, the reaction is "disfavored" - won't proceed in that direction - in fact it may try go in the reverse direction if possible. When the Gibbs free energy for a reaction is less than zero, the reaction is "favored" - it should proceed as written spontaneously. When the Gibbs free energy for a reaction is exactly zero - it is in equilibrium, with the forward and back ward reactions occurring at the same rate.
There are many different possible property changes in a chemical change. You must post the specific reaction for anyone to tell you exactly.
There is something called an inhibitor that works in exactly the opposite way as catalysts. Inhibitors slow the rate of reaction. Sometimes they even stop the reaction completely. You might be asking, "Why would anyone need those?" You could use an inhibitor to make the reaction slower and more controllable. Without inhibitors, some reactions could keep going and going and going. If they did, all of the molecules would be used up. That would be bad, especially in your body. When you are watching television, you have no reason to keep breaking down sugars at the same rates you would if you were working out.
If an atom undergoes a reaction and attains a more stable form, you know if the reaction was a chemical reaction or a nuclear reaction by studying what exactly happened to the atom.
It is not clear from your question what you mean by sharing substances, or exactly what it is that these substances are sharing. However, I'll make a guess. Chemical reactions often involve atoms sharing electrons. And what happens to them during chemical reactions is that the distribution of electrons shifts. Electrons don't have to actually leave one atom and go to another in order to form a chemical reaction. Sometimes it is more a matter of spending some time with one atom and some time with another, or with several others. Electrons are very versatile.