Are all chemical changes irreversible

Answer 1

this is because the body needs to keep on growing hence the chemical processes that result to growth should keep reacting to support metabolism and life,incase we say the chemical reactions are reversed, then it would mean that we grow back to young from old age which is totally impossible....For processes like respiration and excretion in the body, main source of energy which is food must be broken down to give out energy, in case we say the energy could be reversed back to food and vomited out then that would mean no energy to support life hence automatic death. what do you think??

Answer 2

Chemical reactions are only reversible when conditions allow it. Our boby's biggest challenge is maintaining homeostasis, which involves maintaining the perfect conditions for reactions to move only in the direction in which our body wants it to move.

Added:

Some chemical reactions in the body are reversible, while others are not.

There are two kinds of metabolic reactions (this is 'in the body'):

1. Anabolic reactions:

   The set of metabolic reactions that construct molecules from smaller units. These reactions require energy. One way of categorizing metabolic processes, whether at the cellular, organ or organism level is as 'anabolic' or as 'catabolic', which is the opposite. Anabolism is powered by catabolism, where large molecules are broken down into smaller parts and then used up in respiration. Many anabolic processes are powered by adenosine triphosphate (ATP needed)

2. Catabolic reactions:

   The set of metabolics that break down molecules into smaller units and release energy. In catabolism, large molecules such as polysaccharides, lipids, nucleic acids and proteins are broken down into smaller units such as monosaccharides from starch, fatty acids, nucleotides, and amino acids, respectively (ATP, the energy battery, is formed).

This is all valid for the internal energy usage and backup. On the whole body we need energy from outside sources and can not store external energy (eg. from the sun) in large energy rich molecules like starch or fat as plants can do from carbon ioxide and water (photosynthesis).

The breakdown of those (energy rich) molecules

to carbon ioxide and water (respiration) is

not reversible in the body.

Answer 3

NO

Answer 4

Chemical change can be reversible. Many chemical changes are not but some,typically where here is an equilibrium between the reactants and the products, can be reversed.

Answer 5

No, many chemical changes are reversible under the proper conditions.