During a physical change, properties that can change include:
- Shape - Yes, this can change. For example, molding clay changes shape without altering its chemical composition.
The other properties listed (pH level, flammability, and reactivity) are associated with chemical changes:
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PH level - This can change during a chemical reaction (like neutralization) but not during a physical change.
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Flammability - This is a chemical property, which does not change during a physical change.
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Reactivity - This is also a chemical property and remains unchanged during a physical change.
Therefore, the only property from your list that can change during a physical change is 1. Shape.