14. Answer briefly V

 

Catalysts are substances that change the rate of a oxidation reactionrate of a chemical reactionrate of a reduction reactionrate of a physical reaction reaction. For example, metallic iron is used as a catalyst terminatorreagentsinitiator in the production of ammonia by Haber’s process.

 

 

A chemical reaction occurs when one or more substances (reactants) are converted into one or more other substances (products). During photosynthesis is a series of chemical reactionreduction reactionoxidation reactionbiological reaction that convert carbon dioxide and water (reactants) into glucose (sugar) and oxygen (products) in the presence of lightelectricityheatsunlight.