Temperature. It depends on the reaction, in some cases the temperature must be lowered to decrease the rate of reaction, but there are instances when the reaction needs low temperatures to start. So, look at the reaction you want to influence. If it is exothermic(it creates heat) increase the temperature to lower the rate of reaction, if it is endothermic(it needs heat) rise the temperature.
Pressure/volume. Those to are pretty much related, in an inverse proportion relation. If you lower the volume you basically increase the pressure of the system. And if you lower the pressure it has the same effect as if you increased the volume. This is not the point. Concentration is. Read 3.
Concentration. The theory behind why chemical reactions happen is based on two important things: The molecules are in a continuous state of movement and for chemical reactions to take place those molecules need to collide, to make contact, or come into very close proximity (I think this expression is incorrect, non-native English speaker here). You can increase the concentration of reactants by adding more reactants in the system, this way there are more chances of collisions. Another way is to lower the space where the molecules can move. This is the equivalent of increasing the concentration and can be achieved by altering the volume and pressure (Note: There are reactions where the rate increases when the pressure is varied in a certain way, whether it makes sense or not),
Inhibitors. They are the evil twins of catalysts (those substances that increase the rate of reaction). They slow down the reaction in the system they are added in. There are a lot of examples of them, each working for specific reactions, conditions or substances.
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Answer:
Temperature. It depends on the reaction, in some cases the temperature must be lowered to decrease the rate of reaction, but there are instances when the reaction needs low temperatures to start. So, look at the reaction you want to influence. If it is exothermic(it creates heat) increase the temperature to lower the rate of reaction, if it is endothermic(it needs heat) rise the temperature.
Pressure/volume. Those to are pretty much related, in an inverse proportion relation. If you lower the volume you basically increase the pressure of the system. And if you lower the pressure it has the same effect as if you increased the volume. This is not the point. Concentration is. Read 3.
Concentration. The theory behind why chemical reactions happen is based on two important things: The molecules are in a continuous state of movement and for chemical reactions to take place those molecules need to collide, to make contact, or come into very close proximity (I think this expression is incorrect, non-native English speaker here). You can increase the concentration of reactants by adding more reactants in the system, this way there are more chances of collisions. Another way is to lower the space where the molecules can move. This is the equivalent of increasing the concentration and can be achieved by altering the volume and pressure (Note: There are reactions where the rate increases when the pressure is varied in a certain way, whether it makes sense or not),
Inhibitors. They are the evil twins of catalysts (those substances that increase the rate of reaction). They slow down the reaction in the system they are added in. There are a lot of examples of them, each working for specific reactions, conditions or substances.
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