Question

1. explain the difference between a physical change and a chemical change on a molecular level.
2. based on the materials you used and the results of your experiments, what patterns do you see? which materials do you think have similar properties? explain your reasoning.

draw conclusions
write a conclusion that addresses each of the points below.
claim how were you able to determine whether a physical or chemical change occurred in each experiment?
evidence what evidence from your investigation supports your claim?
reasoning explain how the evidence you gave supports your claim. describe, in detail, the connections between the evidence you cited and the argument you are making.

Explanation:

1. In physical change, molecules stay same; in chemical change, new molecules form.
2. Patterns depend on materials' properties. Similar - same reactions/behaviors.

For conclusion: check for new substances, energy change etc. as evidence.

Answer:

1. Physical change: Molecules unchanged. Chemical change: New molecules formed.
2. Analyze experiment results for patterns. Similar - similar reactions.

Conclusion - Claim: Check for new substances, energy change. Evidence: Observable changes. Reasoning: Link changes to claim.