![]() ![]() That means that the molecules change, even though the number of each kind of atom present at the start of the reaction, stays the same throughout. ![]() The atoms do not change, but how they are arranged in relation to each other does change. The important message of this chapter is that atoms are rearranged during a chemical reaction. 8 Matter and Materials, specifically the paragraph Pure Substances. ![]() This chapter builds on the brief introduction to chemical reactions that was covered in Chapter 1 (Atoms) of Gr.
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