how do chemical reactions take place?

Answer 1

bonds between atoms in molecules are broken and new bonds are formed producing new molecules which naturally have different properties.

factors affecting chemical reactions are: 1. nature of reactants, 2. frequency and efficiency of collisions, 3. surface area exposed, 4. temperature, 5.concentration, 6. catalysts

Answer 2

Taking a simple example of one molecule reacting with another - a bimolecular reaction. If two molecules come close enough to react (the first requirement) it is possible they may react. The product formed has to be sensible in terms of it's energy - usually this means it is more stable than the starting materials, so the reaction would give out energy (exothermic).

Also, there is an energy barrier to overcome, so there must be enough energy about (the temperature of the reaction gives the molecules energy) to enable the molecules to get to the position required (called the transition state) so the reaction can take place.

Analogy time. You want to walk to a valley, which is below you, so overall it is a downhill walk. There is a hill in between you and the valley, so to get there you need to get over the hill. If you don't have enough energy to get to the top of the hill you will slide back down to where you are (and there will be no change - no reaction). Once you get to the top, it is fairly easy to get down to the valley.

In the valley it is much harder work to get back to the top of the hill, so you don't go back. If the valley was not much lower than where you started, you might go back - in chemical terms this would be a reversible reaction.

Answer 3

Chemical reactions take place through interaction between electrons. When 2 (or more) atoms come close to react, their orbitals get overlapped with each other. Different theories are used to describe this overlapping in different situations, like the Valence Bond Theory (VBT), Molecular Orbital Theory(MOT), etc. Electrons are shared between the atoms in such a way that each atom has the minimum energy possible after the redistribution of electrons occur, following the overlapping of orbitals.

Answer 4

Bit of a braod question this, but generally chamical reactions take place as the atoms in the chemicals attempt to fill unused spaces in their outer electron shells by sharing / borrowing electrons from other atoms.

To make sense of this you need to understand how atoms are formed and what the differences are(atomically) between different chemical substances and the elements they are made up of.

Link is good resource.

Answer 5

the chemical reactions happens when two substances are not stable (want to have the no. of Electrons that make it stable ) , so one of them give e the other take the e.
so the whole idea is about being stable.

Answer 6

It's just electron dance.

Some compounds and atoms likes to take electrons (electrophyles), others likes to give them away.(nucleophyles)

This moving of electrons is called chemical reaction.
Normally they move in pairs, but not always, when only 1 electron is moving is called radical reaction.

Answer 7

Take two chemically reactive substances. Put them in a beaker. Watch the fun.

Answer 8

When you mix two or more chemicals that dont get on to well together. If you get ny drift?

Answer 9

http://en.wikipedia.org/wiki/Chemical_reaction

It might help you out...