* Physical Change: A change in the form or appearance of a substance, but not its chemical composition.

* Chemical Change: A change where a new substance is formed with different chemical properties.

When you make orange-sicles, you are:

1. Mixing: Combining orange juice and water.

2. Freezing: Lowering the temperature of the mixture, causing it to solidify.

These processes don't change the fundamental chemical makeup of the ingredients (water, sugar, orange juice). You still have the same molecules of water, sugar, and orange juice, just arranged differently in a frozen state.

Key point: If you could reverse the process (melting the orange-sicle), you would get back your original orange juice and water, demonstrating that no new substances were formed.