Question

if you hold a solid piece of pure gallium metal in your hand, your body heat will melt the gallium into its liquid form. this illustrates which of the following?
chemical change
distillation
chemical property
physical change
none of the above

Explanation:

• A chemical change involves the formation of new substances. Here, gallium changes from solid to liquid (same substance, just a state change), so it's not a chemical change.
• Distillation is a separation technique (not relevant here as there's no separation of components).
• A chemical property is a characteristic that involves a chemical reaction. Melting is a physical process, not a chemical property.
• A physical change is a change in state (solid - liquid here) without forming new substances. Gallium melting due to body heat is a physical change.

Answer:

physical change