Question

letting the apple sit out and it turns brown is ___. chemical change physical change

Explanation:

When an apple turns brown after being left out, it is due to a chemical reaction called oxidation. Enzymes in the apple react with oxygen in the air to form new substances with different chemical properties. This is a chemical change, not a physical change which only affects physical properties like shape, size or state without changing the chemical composition.

Answer:

chemical change