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6.05 Rate and Collision Theory

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on 23 April 2015

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Transcript of 6.05 Rate and Collision Theory


8.05 Rate and Collision Theory
The reaction you will be investigating is the reaction that occurs when an Alka-Seltzer tablet is placed into a given amount of water. Alka-Seltzer is an over-the-counter antacid and pain relief medication that is dissolved in water before it is ingested. Each tablet contains aspirin (acetylsalicylic acid), citric acid, and sodium bicarbonate. As the tablet dissolves in water, the bicarbonate ions in the tablet react with the hydrogen ions from the acids that are also contained in the tablet. The carbon dioxide gas produced by the reaction is what causes the bubbling that can be observed.

HCO3- (aq) + H+ (aq) → H2O (l) + CO2 (g)

In this investigation, you will design two experiments which will compare two different factors that may affect the rate of the Alka-Seltzer reaction. Possible factors to be investigated include temperature, surface area, agitation, and amount of reactants. Remember to make sure there is only one independent variable in your experimental design for each experiment. You can only test one factor at a time.

Experiment 3:
Procedure~

Step 1- Fill up one of your cups halfway with
warm
water (near boiling point)

Step 2- Have a timer right next to you, place an alka-seltzer tablet into the cup of water

Step 3- Cover the cup with a balloon to collect the carbon dioxide accumulated and start your timer/stopwatch right away!

Step 4- Lastly, write down any observations and the time that it took the balloon to inflate
Experiment 1:
Procedure~

Step 1- Fill up one of your cups halfway with water

Step 2- Have your timer/stopwatch right next to you, place an alka-seltzer tablet into the cup of water

Step 3- Cover the cup with a balloon to collect the carbon dioxide accumulated and start your timer/stopwatch right away!

Step 4- Lastly, write down any observations and the time that it took the balloon to inflate


Experiment 2:
Procedure~

Step 1- Fill up one of your cups halfway with water

Step 2- Instead of just dropping the tablet in, crush the alka-seltzer tablet , put the crushed tablet into the cup with water and have your stopwatch/timer on hand

Step 3- Cover the cup with a balloon to collect the carbon dioxide accumulated and start your stopwatch/timer right away!

Step 4- Lastly, write down any observations and the time that it took the balloon to inflate

Materials:
3 cups
3 balloons
water
stop watch/timer
Alka-seltzer Tablets
Background Information:
Conclusion:
1.What two factors did you investigate in your procedure, and why did you choose to compare these two factors?

I investigated the effects that heat and surface area would have on the dissolving of an alka-seltzer tablet. The reason I chose these two was because I wanted to know which factor would accumulate more CO2/ less CO2, along with which one would dissolve the quickest.

2.What other factors did you need to control during your investigation? Explain how you controlled each one in your procedure.

I had to make sure that I covered all cups with a balloon as quickly as possible to control the air flowing into the cup. Then I had to control how much water was placed in each cup, which I used the same amount. Other things that had to be the same were the type of balloon used to cover up the cup, the type of cup and the same type of timer for each experiment.

3.What was your prediction about the results of each factor tested in your two lab procedures? Explain your predictions based on your knowledge of the dissolving process, collision theory, and reaction rates.

Well because heat makes particles more faster and that increases the rate of the reaction, I predicted the heat of the water would speed up the reaction. Also, since the rate of the reaction increases due to more contact between the particles, so does the surface area. So I predicted if I crushed the alka-seltzer, it would speed up the reaction.

4.In your own words, explain the collision theory, and what is necessary for a collision to be successful.

The collision theory says that as the number of collisions increase in an amount of time, the higher the rate of the reaction. For a collision to be successful, there needs to be enough activation energy, this way it increases the rate of the reaction.

5.A specific catalyst was not provided for this reaction, but catalysts are useful for increasing the rate of many slow reactions. In your own words, give a detailed explanation of how catalysts can increase the rate of a reaction or process.


Catalysts can increase the rate of a reaction by decreasing the amount of energy required for a reaction to happen. Sometimes temperature, or the pH level can increase the speed of a catalyst.
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