1. What two factors did you investigate in your procedure, and
why did you choose to compare these two factors?
For this procedure, I investigated how different temperatures
of water would affect the alka-seltzer’s rate of dissolution into the water. I
chose to compare boiling hot water and ice cold water in order to be able to
see how the two extremes would affect my experiment.
2. What other factors did you need to control during your
investigation? Explain how you
controlled each one in your procedure.
In order to maintain a level of accuracy, I controlled the
volume of the water (16oz) that I would pour into each glass, as well as rate
of time. In order to accomplish this, I required a graduated cylinder and a
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.
I predicted that the alka-seltzer would dissolve faster in
the boiling water than that of in the ice cold water. I believed this because
of my prior knowledge of how, when water is heated, the molecules of H2O gain
energy, and thusly move faster. As these molecules move at a more speedy rate,
they come into contact with the alka-seltzer more often, consequently resulting
in the tablets dissolving into the water faster. The slower the molecules of
water are moving, or the colder the water is, the tablets will dissolve slower.
4. In your own words, explain the collision theory, and what is
necessary for a collision to be successful.
The collision theory expresses that all together for
gas-stage responses to happen, particles must collide into each other. In this
manner, for a fruitful collision to happen, there must be sufficient activation
energy in the response, which could also be lowered by a catalyst.
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 bring down the activation energy expected to begin
a response. On the off chance that a response is going on gradually, it is in
all likelihood because of there being little activation energy. By including a
catalyst, it causes or quickens a chemical reaction without itself being
influenced and with less energy.