* Physical Properties: These are characteristics of a substance that can be observed or measured without changing the substance's chemical composition. Examples include color, density, melting point, and conductivity.
* Chemical Properties: These describe how a substance reacts with other substances, indicating its potential to change into a new substance. Examples include flammability, reactivity with acids, and tendency to oxidize.
In the case of copper and an acid that produces no reaction:
* No New Substance is Formed: The copper metal and the acid remain as they were before being mixed. No new compounds are created.
* Observation of Resistance to Change: You are simply observing that copper doesn't react with this particular acid, which is a characteristic of copper's nature (a physical property).
Important Note: Even though copper doesn't react with all acids, it does react with some! For example, nitric acid will react with copper, producing copper ions and nitrogen oxides. This is a chemical reaction, as a new substance (copper ions) is formed.
