How would each of the following change the rate of the reaction shown here?
Drag the appropriate items to their respective bins.
decreasing the temperature
adding some H2(g)
adding a catalyst
removing some NO(g)
decreasing the temperature: decrease the rate of the reaction
adding some H2(g): increase the rate of the reaction
adding a catalyst: increase the rate of the reaction
removing some NO(g): decrease the rate of the reaction
In order to determine how each of the following changes would affect the rate of the reaction, we need to understand the factors that affect reaction rates:
1. Decreasing the temperature:
- This change will generally decrease the rate of the reaction. Lowering the temperature reduces the kinetic energy of the molecules, leading to fewer effective collisions between the reactant particles and lower frequency of successful collisions. As a result, the reaction rate decreases.
2. Adding some H2(g):
- Adding more H2(g) will increase the concentration of the reactant, H2, in the reaction mixture. This change will generally increase the rate of the reaction. An increased concentration of reactants leads to a higher collision frequency and more successful collisions, resulting in an increased reaction rate.
3. Adding a catalyst:
- The addition of a catalyst will typically increase the rate of the reaction. A catalyst provides an alternate reaction pathway with lower activation energy. This means that more reactant molecules will have enough energy to overcome the energy barrier and react, leading to more successful collisions and an increased reaction rate.
4. Removing some NO(g):
- Removing NO(g) reduces its concentration in the reaction mixture, which will generally decrease the rate of the reaction. A decrease in reactant concentration decreases the collision frequency and the number of successful collisions, resulting in a slower reaction rate.
So, the changes can be categorized as follows:
- Decreasing the temperature: Decreases the rate of reaction
- Adding some H2(g): Increases the rate of reaction
- Adding a catalyst: Increases the rate of reaction
- Removing some NO(g): Decreases the rate of reaction
To determine how each of the following changes would affect the rate of the reaction, we need to understand the factors that influence reaction rate.
1. Decreasing the temperature: Lowering the temperature generally decreases the rate of a reaction. When the temperature decreases, the kinetic energy of the reactant particles decreases, resulting in slower particle movement and fewer successful collisions between reactant molecules. Thus, decreasing the temperature would reduce the rate of the reaction.
2. Adding some H2(g): The addition of H2(g) would increase the rate of the reaction. In many reactions, the reactant concentrations play a significant role in determining the reaction rate. By adding H2(g), the concentration of one of the reactants increases, leading to a greater number of collisions between reactant molecules. Increased collisions result in a higher reaction rate.
3. Adding a catalyst: A catalyst increases the reaction rate without being consumed in the process. It provides an alternative reaction pathway with lower activation energy, allowing more reactant molecules to overcome the energy barrier and successfully collide. By adding a catalyst, the reaction rate would significantly increase.
4. Removing some NO(g): Removing NO(g) would decrease the concentration of one of the reactants. As mentioned earlier, reactant concentration affects the reaction rate in most cases. By reducing the concentration of NO(g), the number of successful collisions between reactant molecules would decrease, leading to a lower reaction rate.
In summary:
- Decreasing the temperature would decrease the rate of the reaction.
- Adding some H2(g) would increase the rate of the reaction.
- Adding a catalyst would significantly increase the rate of the reaction.
- Removing some NO(g) would decrease the rate of the reaction.