5.1.1 - Energy Transfers in Reactions

Why do chemical reactions occur ?

So that elements can achieve a more stable by gaining a full outer shell of electrons

How is this done ?

This is done my chemical bonding where old bonds are broken and new bonds are formed

What does this process involve ?

This process involves the transfer of energy into and out of reaction mixtures

What are the terms used to describe this ?

System and the surroundings

Where does the energy come from ?

The energy comes from the chemical bonds themselves which could be considered as tiny stores of chemical energy

What happens in the majority of reactions ?

The energy is in the form of heat energy, although sometimes other types of energy are produced such as light or sound

What is an endothermic reaction ?

It is a reaction in which the energy is taken in from the surroundings so the temperature of surroudnigns decreacreases