- Batter and cake are different substances
- Baking a cake turns batter into a cake
- Hence, baking a cake produces a different substance

- Burning a match will produce ashes
- Lighting a match causes that match to burn
- Therefore, lighting a match causes the match to produce ashes

- Lighting a match causes the match to produce ashes
- Match and ashes are different substances
- Therefore, lighting a match produces a different substance

- Baking a cake produces a different substance
- Lighting a match produces a different substance
- Hence, baking a cake and lighting a match both produces different substances

- Baking a cake and lighting a match both produces different substances
- Chemical reactions cause different substances to form
- Hence, lighting a match and baking a cake are both chemical reactions

- Lighting a match and baking a cake are both chemical reactions
- Chemical reactions cause chemical change
- Therefore, lighting a match and baking a cake are both chemical changes

Therefore, lighting a match and baking a cake are both chemical changes
Question: Lighting a match and baking a cake are two actions that involve chemical changes. Why are these actions considered chemical changes?
Context: - Chemical reactions cause different substances to form 
- Batter and cake are different substances 
- Burning a match will produce ashes 
- Match and ashes are different substances 
- Lighting a match causes that match to burn 
- Baking a cake turns batter into a cake 
- Chemical reactions cause chemical change