
Interpretation: The reactions between bleach and ammonia in solution are represented. The difference between given two reactions needs to be explained.
Concept Introduction: A physical change is associated with change in the physical state of the substance whereas the chemical composition remains same.
A chemical change is associated with the change in the chemical composition of the substance. Chemical equation is the symbolic representation of a chemical change in which the chemical formula of the substances are written with their physical states.

Answer to Problem 5E
In the excess of ammonia; toxic chloramine will not form because reaction will lead to form hydrazine and sodium chloride as final product with water.
Explanation of Solution
Given information:
The reaction between bleach and ammonia in solution can occur in two possible ways.
In the limited quantity of ammonia solution, the reaction leads to the formation of poisonous chloramine with sodium hydroxide and water.
In the excess of ammonia; toxic chloramine will not form because reaction will lead to form hydrazine and sodium chloride as final product with water.
Thus, the quantity of ammonia effects the formation of product with bleach.
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