- A leaf is a kind of object
- Fire causes burning on objects
- Therefore, fire can cause a leaf to burn

- Fire can cause a leaf to burn
- Fire is a kind of chemical reaction
- Hence, burning a leaf with fire is a kind of chemical reaction

- Burning a leaf with fire is a kind of chemical reaction
- Chemical reactions cause chemical change
- Hence, burning a leaf with fire causes a chemical change

Therefore, burning a leaf with fire causes a chemical change
Question
Which action causes a chemical change?

Context
- Chemical reactions cause chemical change 
- Fire is a kind of chemical reaction 
- A leaf is a kind of object 
- Fire causes burning on objects