Based on the results of this lab, write a short paragraph that summarizes how to distinguish physical changes from chemical changes.

Physical changes occur when the properties of a substance are retained and or the materials can be recovered after the change. Chemical changes involve the formation of a new substance. The formation of a gas, solid, light, or heat is possible evidence of chemical change.

Explanation:

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.

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