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1. What is the role of a catalyst in a chemical reaction?
 
Catalysts are substances that change the reaction. For example, metallic iron is used as a in the production of ammonia by Haber’s process.
 
2. Why photosynthesis is a chemical reaction?
 
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 that convert carbon dioxide and water (reactants) into glucose (sugar) and oxygen (products) in the presence of .