Chemical Changes the release of gas greater changes of heat the generation of light a change of color the formation of a precipitate These are chemical changes because they change the substance's...
Remember that a chemical change is anything that alters the identity or composition of a substance. So something such as color change, a solid being formed, a gas being produced or temperature...
NO! a chemical change alters the NATURE of an object. for example rust. Iron is no longer iron when it rusts. now its oxidized. that's a chemical change. shape and size are physical