During a chemical change, substances react to form a new substance. some signs of chemical change are gas formation, a change in color, or the production of heat. do you think the reaction between calcium carbonate and vinegar is a chemical change? why?

How is electrolysis most commonly used to produce an energy source? a - splitting water molecules produces oxygen, which organisms breathe to fuel their bodies. b - splitting water molecules produces hydrogen gas, which is used to power machines through hydrogen fuel cells. c - splitting carbon dioxide molecules produces coal, a form of carbon that can be burned to produce heat. d - splitting carbon dioxide molecules produces natural gas, which can be burned to generate electricity in power plants.