Question

multiple-choice question
what are examples of chemical changes (check all that apply)?
□ chopping wood
□ boiling an egg
□ explosions
□ burning wood
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Explanation:

To determine chemical changes, we identify processes with new substances formed:

• Chopping wood: Physical (no new substance).
• Boiling an egg: Chemical (protein denaturation, new structure).
• Explosions: Chemical (rapid reaction, new substances like gas).
• Burning wood: Chemical (combustion, new substances like CO₂).

Answer:

B. boiling an egg, C. explosions, D. burning wood