When you hold a lighted match to a solid piece of wood:At first, thermal energy causes the wood to heat up.If it gets hot enough, the wood begins to undergo combustion, changing chemically into ash, smoke, and gases like carbon dioxide.This is a chemical change because the substance becomes something new and cannot return to its original formIf you hold it to another match, it will ignite quickly because matches are designed to burn. This is also a chemical change, and it's faster because matchsticks have chemicals that ignite easily.