What do "entropy" and "enthalpy" mean?

Question

For Chemistry, I need definitions for the following words:

- Entropy

- Enthalpy

- Spontaneity

- Concentration (often represented by brackets)

- Activation energy

Help, please!

Answer 1

Entropy:Disorder. It is the measure of the disorder of molecules which is seen as DS (delta S)

Enthalpy:The heat content of a system at constant pressure. It is the measure of heat and its seen as DH (delta H). You can find the change of heat using Hess's Law.

Spontaneous Process: A process that needs no outside assistance. Spontaneity is when either a reaction is spontaneous or not spontaneous. You can determine so by using Gibb's Free Energy Equation which is DHsystem (delta H system)-DSsystem (delta S system)= DGsystem (delta G system).

Concentration: a measure of the amount of dissolved substance contained per unit of volume. Source: http://dictionary.reference.com/browse/c...

Activation Energy:energy needed to actually make a reaction occur. The activation energy of a reaction can decrease with a catalyst and it can increase with an inhibitor.

Answer 2

http://www.mathpages.com/home/kmath184/k...

hope this helps

Answer 3

entropy - disorder

enthapy - heat

spontaneity - if somethign would happen without any encouragement

concentration - amount of particles in a given volume

activation energy - minimum amount of energy a reaction needs in order for it to take place

Answer 4

search on wikipedia.com , you will find the answers.