We studied the effect of temperature on chemical reaction rates. Our group wanted to test whether it was true or not that an increase in temperature will cause an increased rate in a chemical reaction.
First we filled the cup with the first temperature of water. Then we dropped one tablet into the cup while simultaneously starting the timer. Finally, we stop the timer when the tablet was fully dissolved and then recorded the time. We repeated the steps 5 times for each of the three temperatures.
We observed the Alka-Seltzer tablets dissolving in the water. Just by looking at most of the experiments you can see that temperature does a have an effect on a chemical reactions rate. Once we stop the timer we recorded the data and we noticed that some of the trials we tested did not fit with the others trial of the same water temperature. This worried us, but the average reaction times, reassured us that we did most of the experiments correctly.
After we found the average reaction rates for each of the water temperatures, we saw that our hypothesis was correct and the higher the temperature of a chemical reaction the faster it takes place. However our experiment did not show a double reaction time with an increase in every 10 degrees Celsius.
Problem : What is the effect of temeperature on the rate at which an Alka Seltzer tablet dissolves in water.
Hypothesis :
If one Alka-Seltzer tablet is placed into an 236.6 ml. glass of water for each trial,
then the trial with the hottest temperature will have the fastest reaction rate.
Variables : independent: temperature dependent: dissolving rate of Alka Seltzer tablet control: amount of water
Materials:
(1) 12 pack- Alka Seltzer tablets
(1) thermometer
(1)clear 354.9 drinking glass
(1) 946.4 ml. measuring cup
(1) masking tape
(1) teaspoon
Hot/cold tap water
Ice
(1) stopwatch
Lab notebook/pencil
Procedure:
fill 236.6 ml. of water into a 354.9 ml. glass
mark water level with masking tape (now you can refill cup to exact level for each trial)
use the same amount of water for each trial, but change temperature (hot, cold, ice cold)
check temperature at the beginning of each trial and record it in notebook
remove thermometer
ensure your helper is ready to start the stopwatch at the same time you drop the alka-seltzer tablet (the doer and helper should count to three together so that the time will start simultaneously with drop of tablet)
stir immediately after seeing bubbles of CO2
look to see if all the little white pieces have dissolved, then yell “stop” so that the helper will stop the timer
record the time it takes for all the pieces of the tablet to dissolve
repeat experiment four times for each of the three different temperatures
record times in a chart and calculate an average reaction time for each temperature
- We studied the effect of temperature on chemical reaction rates. Our group wanted to test whether it was true or not that an increase in temperature will cause an increased rate in a chemical reaction.
- First we filled the cup with the first temperature of water. Then we dropped one tablet into the cup while simultaneously starting the timer. Finally, we stop the timer when the tablet was fully dissolved and then recorded the time. We repeated the steps 5 times for each of the three temperatures.
- We observed the Alka-Seltzer tablets dissolving in the water. Just by looking at most of the experiments you can see that temperature does a have an effect on a chemical reactions rate. Once we stop the timer we recorded the data and we noticed that some of the trials we tested did not fit with the others trial of the same water temperature. This worried us, but the average reaction times, reassured us that we did most of the experiments correctly.
- After we found the average reaction rates for each of the water temperatures, we saw that our hypothesis was correct and the higher the temperature of a chemical reaction the faster it takes place. However our experiment did not show a double reaction time with an increase in every 10 degrees Celsius.
Problem : What is the effect of temeperature on the rate at which an Alka Seltzer tablet dissolves in water.Hypothesis :
If one Alka-Seltzer tablet is placed into an 236.6 ml. glass of water for each trial,
then the trial with the hottest temperature will have the fastest reaction rate.
Variables : independent: temperature
dependent: dissolving rate of Alka Seltzer tablet
control: amount of water
Materials:
Procedure:
Graph:
Data Table: