Question

analyze

1. which of the changes you observed indicated a physical change, and which indicated a chemical change?
2. what are some limitations of this experiment? how could you revise your procedure to improve the results?
3. sketch the difference between a physical change and a chemical change.

Explanation:

1. Physical changes don't alter substance identity; chemical changes do. Need experiment - specific details to identify.
2. Limitations could be measurement errors, uncontrolled variables. Improve by better controls, precise measurements.
3. Physical: change in state/shape. Chemical: new substances formed.

Answer:

1. No specific changes given, can't answer.
2. Varies by experiment, e.g., measurement errors; improve with better controls.
3. Physical: external property change. Chemical: new - substance formation.