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This is a collection with information about chemical reactions as well as reversible and irreversible reactions.
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This is a resource that shows both reactions and discusses if they are reversible or irreversible. It talks about heating, mixing, burning, melting, freezing, etc.
This is a cool game or resource that may be fun to use when teaching this concept. This is for older students.
This demonstrates some reversible changes. If you go to another page, it shows the irreversible changes as well.