Tuesday, February 11, 2014
Activity 6.2 - Reaction Rates -
Activity 6.2 - Reaction Rates Nikki Houston Science 10
Collisions and Temperature
2) Fast
3) When I slide the temperature gauge upwards to increase heat, the molecule begin moving faster at an increasing rate. When I slide the gauge lower for lower temperature, the molecules slow down at a considerable rate until they eventually stop. The molecules stop because the total energy input meter is lowered, where as when I increase heat the total energy input meter is at full capacity. The temperature level is in fact measuring total energy.
4) When temperature increases, the total energy increases, therefore the molecules move faster.
Collisions and Concentration
4) The molecules will speed up because there is more movement of particles within the space(higher concentration), so it increases the total average energy. The molecules are more likely to collide into one another because of the total energy within the space and the amount of particle moving around.
5) The amount of molecules being added to this equation limits the reaction, because the more molecules added the higher total higher average energy. The temperature also limits the reaction because it controls the amount of added or decreased energy. To change the reaction of the molecules, you can increase or decrease the concentration of molecules within the space, or you can increase or decrease the temperature to change the total energy which totals the amount of collision between the particles.
6) Another factor that can affect a reaction rate is variations in state. More specifically the medium in which the reaction occurs. The kind of medium could be anything from liquid vs. solid, gaseous vs. non gaseous. If the variable in a chemical reaction depended on different matter such as if in the case that Molecule A (fig 6.2), was a solid and Molecule Bc (fig 6.2) was a liquid, the reaction would definitely be affected largely. Because of different substances, molecules move differently.
Pressure is another factor that affects reaction rate. Increasing the pressure on a reaction involving reacting gases increases the rate of reaction. Changing the pressure on a reaction which involves only solids or liquids has no effect on the rate. Increasing the pressure of a gas is exactly the same as increasing it's concentration.
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Science 10
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