What occurs in a chemical reaction?

no new atoms or formed or destroyed.reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.

Chemical reaction is a process in which reactants are converted into one or more substance (products), which have properties different from the reactants. In a chemical reaction there will be rearrangement of constituent atoms and molecules but there will be no change in the nucleus. Nuclear chemistry is a sub-discipline of chemistry that involves the chemical reaction unstable radioactive elements.

what's the

it has to be understood that the sea water contains a huge amount of sodium and chlorine ions and if they enter the cell of the atlantic cod fish, the cell will shrivel and the fish will die. to avoid such a condition, the fish uses active transport for the purpose of removing the ions against the gradient.

explanation:

the atlantic cod is not a maritime osmoconformer. its native application of salts is less than that of the seawater it lives in. it is continually falling water from the gills to the ocean via osmosis.

countering that, the fish is going to be swallowing seawater. but since its internal collection of salts is lower than seawater, the fish will want to go free of excess salt, and since that's going upon a gradient, then active transport, requiring energy, must be used to pump out the salt. much marine fish use the organs to filter out the salt and these fish discharge very straight urine.