Question

physical and chemical equations​

Answer 1

Answer:

Changes in a material or system are called reactions, and they are divided into chemical and physical reactions. ... An equation can be used to describe a physical reaction, which involves a change of states. For example, melting, sublimation, evaporation, and condensation can be represented as follows.

Explanation:

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Answer 2

Answer:Changes in a material or system are called reactions, and they are divided into chemical and physical reactions. ... An equation can be used to describe a physical reaction, which involves a change of states. For example, melting, sublimation, evaporation, and condensation .