What happen to a chemical reaction take place?

Answer 1

It's related to the collision theroy. Particles that you have added together to react will react by the atoms of each substance colliding together. the fact that they react is reliant on the atoms having enough activation energy to react and they must collide at the right angle determines how fast the reaction takes place. Atoms must collide at the right position and if they don't they won't react with each other. And if there is not enough activation energy then they will not react either

Answer 2

the chemical reaction takes place because every element wants to get the configuration of its nearest noble gas element . the reason to get this configuration is that because elements of 8th A group are most stable and have least energy states in the Periodic Table ,so by achieving this configuration elements gets more stable and less energy state

for example

Let's look at the reaction of sodium with chlorine. In their atomic states, sodium has one valence electron and chlorine has seven.SodiumChlorine

Chlorine, with seven valence electrons, needs one additional electron to complete its valence shell with eight electrons. Sodium is a little bit trickier. At first it appears that sodium needs seven additional electrons to complete its valence shell. But this would give sodium a -7 electrical charge and make it highly imbalanced in terms of the number of electrons (negative charges) relative to the number of protons (positive charges). As it turns out, it is much easier for sodium to give up its one valence electron and become a +1ion. In doing so, the sodium atom empties its third electron shell and now the outermost shell that contains electrons, its second shell, is filled - agreeing with our earlier statement that atoms react because they are trying to fill their valence shell.

Sodium Chloride

by changeing colour hardness or smell or

any other property change of reacting or produced compounds that are permanent after reaction