3.12 what type of change, physical or chemical, takes place in each of the following?\na. pie dough is…
3.12 what type of change, physical or chemical, takes place in each of the following?\na. pie dough is rolled into thin pieces for a crust.\nb. a silver pin tarnishes in the air.\nc. a tree is cut into boards at a saw mill.\nd. food is digested.\ne. a chocolate bar melts.
Answer
Brief Explanations:
- a. Rolling pie - dough changes its shape but not its chemical composition, so it's a physical change.
- b. Tarnishing of silver is due to a chemical reaction between silver and substances in the air, so it's a chemical change.
- c. Cutting a tree into boards only changes its physical form, not its chemical nature, so it's a physical change.
- d. Digestion of food involves chemical reactions to break down complex substances into simpler ones, so it's a chemical change.
- e. Melting a chocolate bar changes its state from solid to liquid without altering its chemical makeup, so it's a physical change.
Answer:
a. Physical change b. Chemical change c. Physical change d. Chemical change e. Physical change