In 2-3 sentences, in your own words, describe why you chose that type of change in the previous question. Key points you may include in your response: The definition of physical/chemical change The start/end products in a physical/chemical change The start/end appearance in a physical/chemical change The particular evidence observed to indicate a physical/chemical change. (3 points)

Answer 1

I chose to focus on a chemical change because it involves the transformation of substances into new products with different properties, indicating a fundamental alteration at the molecular level. For instance, the rusting of iron starts with metallic iron and oxygen but ends with iron oxide, showcasing a change in appearance and characteristics. Clear evidence of a chemical change includes color shifts, gas production, or temperature changes, which distinctly differentiate it from a physical change that only alters form without altering the substance itself.