All
of the experiments must be done in the presence
of a parent or teacher.
Experiment
1: The Effects of Temperature on Rate of Reaction
Ideas | Materials | Procedure | Observations | Analysis | Summary | Questions
| Ideas |
|---|
1. In order for a chemical reaction
to occur, the particles, atoms or
ions, which are REACTANTS, must physically
come into contact with one another.
Anything that increases the frequency
of these encounters will increase
the rate at which PRODUCTS are formed.
2. The rate of a chemical reaction
can be increased by increasing the
temperature of these reactants.
My predictions:
Using hot water out of the tap, the
rate of reaction will be _________
times faster than at
0 degrees C.
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| Materials |
|---|
|
Note: All experiments should be
done using original formula effervescent
Alka-Seltzer.
- 6 Clear cups
- Measuring cup
- Thermometer, -20 degrees C to
110 degrees C
- 3 Alka-Seltzer tablets
- Stopwatch
- Mortar and pestle
- Source of hot water
- Ice cubes
- Graph paper
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| Procedure |
|---|
|
A. Hot Water
1. Run water from the hot tap until it is as
hot as possible. Fill a clear glass with exactly
8 oz. of hot water.
2. Use the thermometer to take the temperature
and record it on your data sheet.
3. Remove 1 Alka-Seltzer tablet from its package.
Drop it into water. measure the time required
for tablet to fully dissolve. Be prepared to start
and stop on time. The reaction will take less
than 15 seconds. Record the time.
B. Room Temperature Water
1. Fill a clear glass with exactly 8 oz. of room
temperature or lukewarm water.
2. Use the thermometer to take the temperature
and record it on your data sheet.
3. Drop 1 Alka-Seltzer tablet into the water.
Measure the time required for the reaction to
be completed. Record the time.
C. Cold Water
1. Fill a clear glass with 4 oz. of water and
add enough ice to adjust the level to 8 oz. Stir
the ice water for about 15 seconds so the temperature
will come to equilibrium.
2. Use the thermometer to take the temperature
and record it on your data sheet. (Leave the ice
cubes in the water!)
3. Drop 1 Alka-Seltzer tablet into the water.
Measure the time required for the reaction to
be completed. Record the time.
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| Observations |
|---|
|
Water Temperature - Time for Reaction to be
Completed
Hot Tap _____ degrees C ______ Seconds
Room temperature ______ degrees C _____ Seconds
Ice Water _____ degrees C _____ Seconds
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| Analysis |
|---|
|
Graph your data points (water temperature
vs. time to fully dissolve) to show the effect
of temperature on Rate of Reaction.
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| Summary |
|---|
|
As the temperature increases, the rate of
reaction _____________________________.
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| Questions |
|---|
|
1. At a temperature of 10 degrees C, it would
take ______ seconds for 1 Alka-Seltzer tablet
to react with 8 oz. of water.
2. If the temperature is doubled from 20 degrees
C to 40 degrees C, the time for the rate of reaction
______by approximately _______.
3. Using hot tap water, the rate was ______ times
faster than at 0 degrees C.
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