Chemical Reactions and Thermodynamics

Classified in Greek

Written at on English with a size of 2.59 KB.

Termoquimica:

-Reacciones electroquimicas: intercambio de energia interna en forma de trabajo electrico./ -Reacciones termoquimicas: intercambio de energia interna mediante calor y trabajo mecanico./ -Reacciones fotoquimicas: intercambio de energia interna en forma de radiacion electromagnetica.

Ley de hess:

El calor absorbido o desprendido por una reaccion quimica a presion constante es siempre el mismo, independientemente de si el proceso se lleva en una o varias etapas.

Espontaneidad:

-Proceso espontaneo: Aquel que se produce sin la necesidad de exponentes externos./ -Proceso no espontaneo: Aquel que se puede llevar a cabo gracias a la accion de agentes externos./ -Procesos imposibles: aquel que no se puede llevar a cabo de ninguna manera ni forma.

Ác. carb. -COOH carboxi- Ácido...oico

Ésteres -COO-R - ...oato (de R)// Amidas -CO-NH2 - -amida

Nitrilos -CN ciano- -nitrilo// Aldehídos -CHO formil- -al

Cetonas -CO- oxo- -ona// Alcohol -OH hidroxi- -ol

Aminas -NH2 amino- -amina// Éteres -O-R (R)-oxi -

Gibbs: DG= H - T * DSistema

The Tipp-Ex correction fluid is a white liquid. It is used for painting over mistakes in a piece of writing. A brush (which was later replaced by a foam applicator) is attached to the cap, so when the bottle is closed, the brush is immersed in the Tipp-Ex. When unscrewed, the brush is covered in liquid Tipp-Ex which is then painted over the mistake. However, it is still possible to see that Tipp-Ex has been used, and also the original content if the paper is held up to a light.

If the contents of a Tipp-Ex bottle have been exposed to too much air (for example, if the cap has been unscrewed too long or if the bottle is half-full and there is air filling the space), the Tipp-Ex becomes thicker, and sometimes even solidifies. To help prevent this, Tipp-Ex released a product called "Tipp-Ex thinner", a few drops of which are mixed with the contents of a bottle of partially dried Tipp-Ex to thin it. This extends the lifetime of a Tipp-Exbottle.

Entradas relacionadas: