1. without in cells, the reactions in living things would occur too slowly or require temperatures that are too high for cells to survive. a. high concentrations of reactants b. high concentrations of products c. the presence of inhibitors d. the presence of enzymes 2. which part of the fire triangle provides the activation energy needed to start a fire? a. heat b. flame c. oxygen d. fuel 3. how is the rate of a chemical reaction related to temperature? a. it is dependent upon the temperature. b. it is independent of the temperature. c. it is slowed by higher temperature. d. it is unrelated to temperature 4. what is a substance used to decrease the rate of a chemical reaction? a. fuel b. catalyst c. inhibitor d. enzyme 5. when two liquids are mixed in an endothermic reaction, what always happens to the temperature of the solution? a. it gets colder. b. it cools off until it freezes. c. it gets warmer. d. it heats up until it boils. 6. why does baking bread require a constant input of heat from the oven? a. it is a chemical reaction. b. it is a physical reaction. c. it is an endothermic reaction. d. it is an exothermic reaction. what is the best form of fire safety? a. the fire department b. an extinguisher c. fire prevention d. a water hose . an exothermic reaction a. does not require activation energy b. releases less energy than it uses c. takes more time than an endothermic reaction d. releases more energy than it uses what type of chemicals act as biological catalysts by speeding up reactions in living things? a. enzymes b. fuels c. inhibitors d. reactants which describe a rapid reaction between oxygen and a fuel? a. activation b. combustion c. heat d. decomposition when you chew your food to break down the larger pieces into smaller particles, how are you to increase the rate of the chemical reactions in your body that breaks down your food? a. by increasing the temperature. b. by increasing the concentration. c. by increasing the surface area. d. by limiting the effects of inhibitors. what is the purpose of the burning splint in a reaction? a. to change the reaction from an endothermic to an exothermic reaction b. to change the reaction from an exothermic to an endothermic reaction c. to lower the activation energy d. to provide activation energy which is an example of how to supply activation energy to begin a reaction? a. add an inhibitor. b. heat the reaction flask on a hot plate. c. add a catalyst. d. cool the reaction flask in an ice bath. if a burning candle is covered by a large glass beaker, the flame will go out. how does the beaker affect the conditions described by the fire triangle? a. it limits the fuel available to the flame. b. it prevents more oxygen from reaching the flame once the existing oxygen is used up. c. it limits the heat available for the flame to continue to burn under the glass beaker. d. it removes oxygen from the flame. will mark brainliest i need the answers