Interpretation:
Whether baking cookies using sugar, butter, eggs and flour is a chemical change or not needs to be determined.
Concept introduction:
Chemistry deals with the different processes which occur in surrounding and is directly or indirectly related with each other.
Different changes taking place in the environment can be physical and chemical on the basis of change in physical state and chemical composition of the matter.
Physical changes are related to change in the physical state of the substance whereas the chemical change is associated with change in chemical composition that results the formation of new chemical substance/s.
Answer to Problem 4E
The preparation of cookies from eggs, butter, flour and sugar is a chemical change as it is irreversible change.
Explanation of Solution
When sugar, butter, eggs and flour are mixed together, the mixing is physical change as no new substance is formed only the individual physical properties of ingredients are changed.
When these ingredients are baked in oven, due to heat the solidification occurs which is a chemical change. Also, this change is irreversible in nature because it is not possible to get back to eggs, butter, flour and sugar when cookies are formed.
The preparation of cookies from eggs, butter, flour and sugar is a chemical change as it is an irreversible change.
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