Assignment:
Observe 10 changes that took place in your community. Record them, then classify as to physical and chemical change.
Observe 10 changes that took place in your community. Record them, then classify as to physical and chemical change.
Answers & Comments
Answer:
Students have difficulty distinguishing between physical and chemical change, despite formal teaching, and the distinction is somewhat arbitrary. However an understanding of the differences between purely physical processes such as melting, evaporation and boiling and the changes that take place in chemical reactions, particularly the idea that new substances are formed, is important to an understanding of chemistry and students very frequently confuse the two.
Explanation: