Effect Of Temperature On Rate Of Reaction example essay topic

Effect of temperature on RUN rate Daniel Amir eh 10-3 Khalil KarajehFactors affecting rate of reaction: Surface area - as we increase surface area, we increase the reaction rate. The more the collisions the faster the reaction. Concentration - as we increase concentration we increase the reaction rate. In reaction with between gases, increasing the pressure, increase the reaction rate. Temperature - as we increase the temperature, we increase the reaction rate. Raising the temperature makes particles collide more often in a certain time, and makes it more likely that collision results in a reaction.

Catalyst - catalyst is a substance, which speed up a chemical reaction. At the end of the reaction the catalyst is chemically unchanged. Aim: Effect of temperature on rate of reaction. Hypothesis: I predict that the rate of reaction will increase in speed by increasing the temperature, because Raising the temperature makes particles collide more often in a certain time, and makes it more likely that collision results in a reaction. Apparatus required: 1) 4 conical flasks 2) An amount of HCl 3) An amount of Na 2 S 2 O 34) Timer (stop-watch) 5) A tile with a mark (X) on it 6) 2 measuring cylinders 7) 1 empty beaker Procedure: 2- Use 20 cm 3 of water with 30 cm 3 of HCl 3- Add the solution to 30 cm 3 of Na 2 S 2 O 34- Put a conical flask on a tile with a mark (X) on it.

5- Put the first solution in the flask. 6- Put the flask in a water bath at a controlled temperature of 30 oC. 7- Quickly add the second solution and start timing 8- Stop timing when you can no longer see the mark (X) on the tile. 9- Repeat steps 1 to 4 but using a different temperature each time. 10- The final time use the same amount but at 70 oC. Fair test: Changing Variable: Temperature (oC) Constant Variables Amount, and concentration of HCl, and Na 2 S 2 O 3 Results: Temperature / o C Time / sec 20 2825 2730 2235 2040 1645 1350 7 Conclusion: From my results I have concluded that temperature has a great affect on the reaction rate of HCl and Na 2 S 2 O 3, because as we see from he graph the slope is increasing gradually, this is because increasing the temperature makes particles collide more often in a certain time and makes it more likely that a collision will result in a reaction.

Because there are more effective collisions, temperature has a great affect on reaction rate, if you raise the temperature by 10 oC the time will decrease by nearly 6 seconds indicating the increase in speed of the reaction. Evaluation: From my experiment I have found some sources of error, which are that when I was adding the HCl to the Na 2 S 2 O 3 I was adding quickly so some of the HCl spilt from the test tube and didn't go inside the flask containing Na 2 S 2 O 3, so my results might not be very accurate. Also when I was adding HCl to a measuring cylinder I didn't accurately read the cm so my results might have been affected..