1. why does putting baking soda on a fire put it out? a. the baking soda cools the fire off so it can’t burn. b. co2 gas is produced reducing the amount of heat. c. the fuel is covered and not available to the fire. d. co2 gas is produced cutting off the flow of oxygen. 2. why does baking bread require a constant input of heat from the oven? a. it is a physical reaction. b. it is an endothermic reaction. c. it is a chemical reaction. d. it is an exothermic reaction.