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Two factors that would decrease the rate of a reaction are:
1. **Decreasing the temperature of the reaction vessel:** Lowering the temperature reduces the kinetic energy of the particles, making them move slower and collide less frequently, which decreases the chances of successful collisions and thus decreases the rate of reaction.
2. **Ensuring that the reaction is endothermic:** An endothermic reaction absorbs heat from its surroundings. When heat is absorbed, the reactant particles require more energy to react, which can slow down the reaction rate.
These two factors work by either reducing the energy of the reacting particles (lower temperature) or requiring additional energy input (endothermic reaction), both of which lead to a decrease in the rate of reaction.
