Is reactivity a chemical or physical property?

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Tags

1. #react
2. #measured
3. #properties
4. #reactivity
5. #substances
6. #matter
7. #undergoes
8. #chemical
9. #different
10. #include
11. #change
12. #entirely
13. #become
14. #observed
15. #other
16. #ability
17. #flammability
18. #chemically