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Chemistry

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by

Riley Keindal

on 22 October 2014

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Transcript of Chemistry

Effect of Temperature on Reaction Rate

Procedure:
100 ml of water that had been boiled was placed in a 200 ml beaker. The temperature of the water was recorded. One whole alka seltzer tablet was placed in the beaker and the time taken for the alka seltzer tablet to dissolve was recorded. All of these steps were repeated except the 100 ml of boiling water was replaced with 100 ml of icy water. These steps were repeated again replacing the 100 ml of icy water with 100 ml of room temperature water.
Hot water
Icy water
Room temp
Initial temp
Time taken to
dissolve
73 °c
12 °c
26 °c
22.46 sec
2 min & 16 sec
57.4 sec
Observations:
Discussion:
Equations:
Works cited
Rowland, T. (2002, January 1). Facilitator/Educator Guide: Plop, Plop, Fizz Fast: The Effect of Temperature on Reaction Time. Retrieved October 4, 2014, from http://www.sciencebuddies.org/science-fair-projects/Classroom_Activity_Educator_Temperature_Reaction_Time.shtml
Balanced equation
C6H8O7 (aq) + 3NaHCO3 (aq) ----> 3H2O (L) + 3CO2 (g) + Na3C6H5O7 (aq)
molecular theory
NEt ionic equation
3hco3 + 3h ----> 3h20 + 3co2
Calculations
States that
As the temperature first increases, the reaction rate drastically increases because the collision frequency of the particles increases. After a while, the graph plateaus off becauses there is a limited number particles that can potentially collide with each other and then taper off to a constant reaction rate.
All particles are in constant motion
collisions are happening other particles and walls of the container
Collision theory
bicarbonate
grams: 1.916
MOlar mass: 84
1.916 / 84 = 0.022
Citric acid
grams: 1
Molar mass: 192
1 / 192 = 0.005
Rates
Hot water
1 / 22.45 = 0.044
ICy cold water
1 / 129.6 = 0.0077
Room temperature
1 / 57.4 = 0.017
Graph
Increase in temperature has dramatic affect on rate of reaction increasing everything else hence the higher the temperature the more the collision hence the the less time it takes for the Alka Selzter to dissolve.

time vs temp
REaction rate
Arrhenius graph
Mundo, G., & Moussa, K. (n.d.). Arrhenius Equation. Retrieved from http://chemwiki.ucdavis.edu/Physical_Chemistry/Kinetics/Modeling_Reaction_Kinetics/Temperature_Dependence_of_Reaction_Rates/The_Arrhenius_Law/Arrhenius_Equation
Examples:
k = Ae ^-ea/rt
e^(-1/273+x)
Glow sticks
Canada day
In this lab, the effect of the temperature of water, on the rate of reaction with an alka seltzer tablet is tested. The collision theory states that particles must collide with enough force, and have the correct orientation in order to react. Temperature is a variable that can affect the reaction rate. This is possible because a higher temperature causes the particles to move faster, giving an opportunity for more collisions. Because the particles are moving faster it also gives the particles the chance to collide with enough energy to surpass the amount of activation energy needed, causing a faster reaction. This is relevant in a reverse effect when looking at food in a fridge. The lower temperatures cause the reactions that spoil the food to occur slower. From this, we can conclude that if the temperature of the water increases, then the reaction rate will increase because of the faster, and stronger moving particles.
Materials
3 Alka Seltzer tablets
Thermometer
Ice water
Boiling water
200 ml beaker
Graduated cylinder
Stop watch
The lower the temperature the lower the activation energy but as the the temperature increases the kinetic energy increasing the activation energy causing the molecules to collide with each other frequently .
Analysis
in this lab we observed that as the temperature of the water got hotter then Alka seltzer tablet dissolved faster. this is because temperature has an effect on the reaction rate. as stated early when the temperature increases it causes the particles to move faster which allows a higher chance for the particles to collide. Since the particles have a higher chance of colliding there is a higher chance for the particles to react. therefore the alka seltzer dissolved faster in the hot water because the particles had a higher chance in colliding which allowed the reaction to happen faster.
Source of Error
beakers- when conducting the lab we used the same beaker for the three reactions that we did. This could have effected our results because the beaker would have changed to the temperature of the water which then could have effected the temperature of the next experiment. next time for this experiment it would be best to use 3 different beakers for each separate experiment.
stop watch- when timing the reactions it is difficult to get the exact time that the reaction ends because its hard to tell when it is completely finished. the alka seltzer tablets break apart as they are dropped in the water and while it reacts there's a bunch of bubbles which could hide some of the broken pieces of the tablet. we could have waited for all of the surface bubbles to leave but that could have also effected the results.
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Full transcript