Question

a scientist is examining an unknown solid. which procedure would most likely help determine a chemical property of the substance?
heating it to find the temperature at which it melts
exposing it to a flame to see if it catches on fire
hitting it with a hammer to determine if it breaks or bends
placing it in water to find out whether or not it dissolves

Explanation:

Chemical properties involve changes that alter the substance's identity. Exposing to a flame (combustion) is a chemical change. Melting (physical), breaking/bending (physical), dissolving (physical) are physical property tests.

Answer:

Exposing it to a flame to see if it catches on fire.