Which of the following is an example of a chemical change?

Question

BlackTom AI · Accepted Answer

The question asks for an example of a chemical change.
First, recall what distinguishes a chemical change from a physical change: during a chemical change, new substances with different chemical properties are formed, often accompanied by energy changes such as release or absorption of heat, color change, odor, or gas production.
In this context, if we consider the commonly cited example, burning wood is a chemical change because combustion converts the cellulose and other components into new substances like charcoal (carbon), ash, carbon dioxide, and water, releasing flame and heat in the process. The original material (wood) undergoes a chemical reaction (oxidation) rather than merely changing form.
If we compare to physical changes, shredding, bending, or melting wood are typically physical changes where the material’s identity remains the same, only its form or state changes, and no new substances are produced.
However, a note on the provided options: the prompt includes an answer field stating 'Burning wood' but the answer_options list is empty. This means the explicit set of choices presented to the student is missing, so we cannot evaluate other alternatives in this question as written. In general, when options are missing, you should rely on the standard definitions and typical examples to identify a chemical change like combustion, oxidation, decomposition, or synthesis, rather than a physical change like cutting or melting.
In summary, burning wood is a classic example of a chemical change because it yields new chemicals and releases energy, illustrating the core difference from physical changes where the substance’s identity remains unchanged.

Pre-AP CHEM S1 Final - P2

Which of the following is an example of a chemical change?

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