Chemists come

How does changing the mass or temperature of reactants affect the rate of a chemical reaction in an open system?

more heat = more kinetic energy = particles moving faster = more collisions = faster reaction 🤓

increasing the temp would increase the rate of a chemical rxn.

don’t remember the mass one

Higher temperature means higher Energy, which means the reaction reaches its activation Energy quicker, so the reaction is quicker.
Higher mass of the reactants doesn't necessarily alter the speed or the reaction, but it could lead to a greater surface area or a higher concentration (if dissolved in a liquid for example) which do lead to higher reaction speeds