Nuclear reactions change the composition of an atom's nucleus, hence nuclear reaction.
Uranium-235 has the property of undergoing fission (splitting) when it absorbs another neutron, and this fission releases energy in the form of heat. Energy cannot be put back into the uranium, it is a one-way process which destroys the uranium nucleus and forms other lighter elements.
Chemical composition and internal arrangement of atoms
Indeed by the Law of Conservation of Mass, mass cannot be lost or gained through a reaction. Similarly, atoms cannot be lost, gained or somehow transformed themselves-only rearranged into different compounds. This means there are still going to be the same amount of Hydrogen atoms after a reaction as there were before.
The same number of each type of atom (each element) still exists after a chemical reaction. They simply attach to other atoms (or detach) in various ways to form molecules (or molecules break apart into atoms).
A physical change is a change where the atoms might get separated but there is no change in it's chemical. It all depends on what you did with the atoms (For example, poisoning something is a physical change), and if the thing itself is edible.
The energy involved in chemical reactions is not so strong to affect the identity of atoms; only nuclear reactions can modify an atom.
In nuclear reactions the atom itself changes while molecules and/or structural organisation of atoms do in chemical and physical changes.
i think that in nuclear reactions but in normal reaction not created and destroyedAdded:No, never created or destroyed. Only in nuclear reactions some atoms may change in other atoms (by decay or fusion) but still not (totally) distroyed.
Fusion of smaller atoms to form larger atome is a nuclear change. Ex: 4 hydrogen atoms FUSE to form an atom of helium through a compeles set of nuclear reactions.
Fusion of smaller atoms to form larger atome is a nuclear change. Ex: 4 hydrogen atoms FUSE to form an atom of helium through a compeles set of nuclear reactions.
No, the composition of a substance can change through chemical reactions. During a chemical reaction, bonds between atoms can break and new bonds can form, resulting in a change in composition.
nuclear fission
No. Atoms never, ever break in chemical reactions. Molecules break if you want to see atoms break, look up nuclear reactions
You think probable to nuclear reactions.
No, chemical reactions do not produce new atoms. Atoms are rearranged in chemical reactions to form new substances, but the number of atoms remains constant before and after the reaction. This is known as the Law of Conservation of Mass.
According to Dalton's atomic theory chemical reactions occur when atoms are separated, joined, or rearranged. Atoms of one element, however, are never changed into atoms of another element as a result of a chemical reaction (it is possible only during nuclear reactions and radioactive disintegration).
Chemical energy arises through reactions between atoms of different materials, whilst nuclear energy arises through reactions in the nucleus of the atoms. In chemical reactions the nuclei are not affected or changed.