Question

a physical change occurs when _______.
there is a flame
elements chemically combine to form a compound
the size, shape, or state of matter changes

Explanation:

A physical change involves alterations in the physical properties of matter like size, shape, or state (e.g., melting ice from solid to liquid). A flame indicates a chemical change (combustion). Chemical combination of elements to form a compound is a chemical reaction.

Answer:

the size, shape, or state of matter changes