* Physical change: A change in the form or appearance of a substance, but not its chemical composition.
* Chemical change: A change that results in the formation of new substances with different chemical properties.
When you melt sugar, you're only changing its state from solid to liquid. The sugar molecules themselves remain the same. You can still get the sugar back to its solid form by cooling it down.
Here's an example of a chemical change involving sugar:
* Burning sugar: When you burn sugar, it reacts with oxygen in the air, producing carbon dioxide, water, and ash. This is a chemical change because the sugar molecules are broken down and new substances are formed.
