Answer:
It demonstrates that it a physical change because you can't see nothing happening but something happening
Sry if it doesn't make sense
Answer:
Coal is made from plants that were once alive! Since coal comes from plants, and plants get their energy from the sun, the energy in coal also came from the sun
I'm pretty sure a physical change because it's affecting the form of the chemical substance, but not its chemical composition
An acid because of its high content of citric acid
