Which statement describes all chemical changes, but not all physical changes? a.) bubbles are produced b.) a new substance forms c.) phase changes occur d.) a color change occurs

B. a new substance forms.

Option (B) is the correct answer.

Explanation:

A chemical change is a change which occurs due to change in chemical composition of a substance.

For example, churning of milk into curd is a chemical change because chemical composition of milk changes as it turns into curd.

Thus, we can conclude that out of the given options the statement a new substance forms describes all chemical changes, but not all physical changes.

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