Answer: The author's purpose is to inform and educate the reader on the difference between physical and chemical changes in matter.
The argument/claim made by the author is that physical changes do not change the identity of matter while chemical changes do turn matter into a new kind of matter with different properties.
Evidence to support the argument is provided by giving examples of physical changes (bending or flattening clay) and chemical changes (burning paper to ash). The author also states that physical changes are temporary while chemical changes are permanent.
The organizational structure of the text is informational, as the author is simply presenting facts and examples to the reader.
Explanation: The organizational structure of the text is descriptive and informational. The author is describing the differences between physical and chemical changes and providing examples to illustrate the concepts. There is no clear narrative structure, chronological order, cause and effect relationship, problem/solution format, or comparison and contrast. The author is simply defining and describing the concepts of physical and chemical changes in matter.