b) I can account for this result because we put the rocks on a balance scale and measured the mass. The mass decreased by 2 grams. 3. If I had continued to shake the rock chips for an hour, I think they would have become very small and decrease in mass even more. 4.
Part 4 involved using a 2-meter stick and dropping various objects and recording the time it took for them to fall. The last part, was to monitor our own heartbeats, we had to count 100 heartbeats and record the time. Equipment: Stop watch, Pen, Paper, meter stick, coffee filter, steel ball Discussion and Conclusion: For part 1, we tested our own reaction time using a stop watch, to see how long it would take to start and stop the stop watch. I noticed that the more trials that were done, the more efficient each of us became, the reaction times became quicker and quicker with each trial. I started out my first trial at 0.47 seconds and my last was 0.22 seconds.
After 5-10 minutes with the heat we started to observe a color change, after the CuSO4 (copper sulfate) cooled it had turned a grayish/ blue color. Using the electronic balance we weighed the CuSO4 with the crucible, which weighed 19.972 and subtracted the original weight of the crucible (19.972-19.071), which came to about .901, the weight of the leftover CuSO4. Heating to a constant mass is the only way to insure that the reaction is complete. It means checking the mass to ensure it is near each other at the end of a reaction. The color change in the copper sulfate when we heated it indicated that all of the water has evaporated, to be sure, we heated and weighed the crucible and CuSO4 again, and it came out to be .901g again.
* Document the time it takes .I will repeat the process three times and take the average amount of time it took for the solute to dissolve in the solvent of high temperature. * Secondly I will start the second experiment with moderate amount of temperature for example the temperature of the solvent could be half of the temperature of the previous experiment and follow the same steps. * Finally for my third experiment, I will use cold tap water and follow the above steps and compare my findings by filling the results in the table. I also make sure that equal amount of solute and solvent added in to the container to make my findings more accurate. The table below shows the result of the experiment Time taken for sugar to dissolve (sec) | Volume of water | Temperature of water | 1st result | 2nd result | 3rd result | Mean result
We then added a magnetic stir bar to help stir solutions and then turned the right knob on the hot plate to begin stirring. 3) Using a timer, we recorded the color of the solution every twenty seconds until we saw a change in color of the solution in which the solution
Diet Coke and Mentos Project Lab Team Members (no more then 3): ________________, __________________, _______________________ Date Assigned: ______________ Date of Lab: ________________ Date Lab Report Due (1 per team): __________________ Diet Coke and Mentos is a classic example of how a chemical reaction can occur. The difference is that everything that you need to make this reaction go, you can find outside of the Chemistry classroom. During this lab, we will be investigating how to get the highest “Diet Coke fountain” possible. In your teams of no more then 3, you must decide a variable to test. This means that you can only change 1 thing about the classic reaction!
We had the same amount of DPIP except for the blank and different amount of phosphate buffer. We have the same amount of succinate except for tube 4 and no inhibitor except for tubes 3 and 4. After we finished putting all the solution, we then start using the spectrometer. We first caliberated with the blank, then every 2 minutes we keep we add all the samples in the spectrometer until 16 minutes have passed. Are results: we conclude that the Tube 4 had the highest rate of reaction because the absorbance was the lowest .
I believe this will happen because the more sugar molecules there are at the same time, the longer it will take for them to find space inbetween the water molecules. Aim Does the amount of sugar affect how fast the sugar dissolves? The experiment The experiment was based on dissolving different quantities of sugar in 100ml water at 60ºC and to keep track of how much time it took for the sugar to dissolve. We made sure that we used the same amount of water in each trial, and that the temperature was maintained at 60ºC. I think that if we do not have the same amount or the same temperature, we might influence the experiment in a way that would make it impossible to tell if the amount of sugar to be dissolved had an influence on time.
As you add it, start your stopwatch. d. Stop your stopwatch when you can no longer see the X through the beaker, and record the time in the data table below. 2. Rinse the beaker out and repeat for each trial. 3.
Make sure you graph along the rigid side because fingerprints on the clear sides can mess up the readings. You then pipet the amounts of material listed in Table 1 of your lab manual, then shake the mixes thoroughly. Turn on you spectrophotometer and set the wavelength dial 540 nm. Allow the instrument to warm up for ten minutes. Then prepare the unknown sample by pipetting 1 ml of the unknown solution into the cuvette and mix with 1 ml of dilute ferric nitrate.