Erika wants to experiment with sugar cubes. which of the following causes a sugar cube to only change physically, not chemically? burning the sugar cube with a match chewing the sugar cube and digesting it breaking the sugar down into different substances using sulfuric acid crushing the sugar cube and dissolving it in water

Dissolving the sugar cube in water is a physical change. It doesn't alter the sugar's chemical structure like burning it or breaking it down with acid.

Caffiene and drowezyness medication

I’ve personally felt invisible all my life, especially when a friend turned out to be fake and didn’t seem to take any type of interest in what i said or any type of input i said. being invisible is a terrifying feeling to experience due to the fact you feel like no one sees you and just sees you (sorry if that doesn’t make sense). it’s like a deep emptiness that no one can fill, just you; you have to fix that emptiness by yourself and you don’t really want , or in some cases want to be invisible. i can see many invisible people when they intentionally stay away from people that can potentially hurt them in any way. also, when a person intentionally breaks off a connection so they aren’t seen by people.hope it