PDF chapter test TRY NOW

5. True or False. If False, give the correct answer II

1. If the chemical properties of a substance remain unchanged and the appearance or shape of a substance changes it is called a periodic change.

A periodic change occurs when the chemical properties of a substance stay unchanged while the appearance or shape of the substance changes.
If the chemical properties of a substance remain unchanged and the appearance or shape of a substance changes it is called a fossil change.

2. Tarnishing of silver is an example of endothermic change.

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