Question

select the two correct answers
□ cutting a paper up
□ wood burning
□ crush a soda can
□ a browning apple
□ soured milk
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Explanation:

To solve this, we identify chemical changes (involve new substances) vs physical changes (no new substances).

• Wood burning: Combustion, new substances (ash, CO₂) → chemical change.
• A browning apple: Enzymatic oxidation, new compounds → chemical change.
• Soured milk: Bacterial fermentation, new acids → chemical change.
• Cutting paper, crushing can: Physical (shape change, no new substance).

The question asks for TWO correct answers (likely chemical changes; common pairings here are wood burning + browning apple, or wood burning + soured milk, but based on typical questions, wood burning and a browning apple (or soured milk) are chemical. Assuming the intended two are wood burning and a browning apple (or soured milk—here we pick wood burning and a browning apple as a common pair).

Answer:

B. Wood burning
D. A browning apple

(Note: Alternatively, Wood burning and Soured milk is also correct. The key is selecting two chemical changes. The options with new substances formed are Wood burning, A browning apple, Soured milk. Any two of these are correct.)