It is not a chemical change, unless you heat it sufficiently to make it catch fire.
Heating up sulfur is not a chemical change.
Heating a frying pan is a physical change. A chemical change is when you change the chemical properties. Heating the pan is only changing the temperature of the pan not the chemical make up.
cold water heating up to its boiling point a physical change or a chemical change
Yes, it can. Example: heating up,
Yes, it can. Example: heating up,
No, it is a chemical change. The metal oxide formed is a new substance.
Sulfur is a pure chemical element, so the only thing that makes up sulfur is, well, sulfur.
Heating, grinding, stirring are physical processes.
Generally speaking the answer is yes, but only 'heating up' or 'mixing' is purely physical.
No. That is a change in physical properties. Signs of a chemical change are burning, color change, heat or cold. Obviously simply heating something up directly doesn't count nor adding coloring.
Heating the wood (and not burning it) would be a physical change. If the wood splinter catches fire and burns, then it is a chemical change because a combustion reaction has taken place and the wood is no longer the same chemical composition. It will turn into carbon dioxide and water, and other materials left over.
A chemical change can be speeded up by a catalyst
catalyst speeds up chemical change