- Magnesium is flammable
- Magnesium is a kind of substance
- Therefore, magnesium is a flammable substance

- Magnesium is a flammable substance
- Flammability is a property of substance and includes values of flammable / inflammable
- So, magnesium is a substance that is flammable

- Magnesium is a substance that is flammable
- If a substance is flammable , it can burn
- Therefore, magnesium can burn

Hence, magnesium can burn
Q: Physical and chemical properties can be used to classify substances. Which of these shows a chemical property?
Context:
- Magnesium is flammable 
- Flammability is a property of substance and includes values of flammable / inflammable 
- Magnesium is a kind of substance 
- If a substance is flammable , it can burn