c. Prepare the solution by dissolving 38.90 grams of ZnI2 with 500 mL of water. d. 0.0125/0.25 = 0.05 L = 50 mL. This produces 0.0125 moles of ZnI2 5. Exercise 5: a. (0.125)(0.1) = 0.0125 moles of solute b. Pour 50 mL of the stock solution to get the number of moles needed.
Record the mass of thyme used. 2. Using a measuring cylinder, add 50cm3 of 1.0mol dm-3 sulphuric(VI) acid and boil gently for 5 minutes. 3. Allow the mixture to cool for a few minutes then filter it, using either gravity or vacuum filtration.
After it was properly cooled, the solution was equally distributed to four centrifuge tubes and centrifuged for 5 minutes. The supernatant was poured out and the leftover clay was suspended in distilled water, then it centrifuged again and the supernatant once again was disposed of. The clay in the four centrifuge tubes was removed and put in a large beaker that contained the rest of the class’s clay. The next week, 40 mg of the clay made by the class, 39.0 mg of Bentonite clay, and 40 mg of charcoal were each added to a centrifuge tube along with 15 mL of Procion Red dye and shaken. The tubes were centrifuged for 2 minutes, then taken out and transferred to cuvettes using a pipet.
Add 0.1M HCl one drop at a time. Use the stirring stick and stir each time a drop has been added. Determine the pH after 5 drops have been added. Repeat the procedure until 30 drops have been added. 4.
The controlled variables is the numbers of beans, timed every 5 min for all respirometers. 5. I want to see your processed data table and I want to see the graph of oxygen use for your mung beans both in the ice bath and they in regular temperature. Use corrected values. Key: respiration rate/ temperature Table 1 | ml/ 5minutes | Ml/5minutes | Ml/minutes | Ml/5 minutes | Time | Room temperature bean | Room temperature glass | Cold temperature bean | Cold temperature glass | Initial | 6.1/25 | 8.2/25 | 8.2/11 | 7.5/11 | 5 | 6/24 | 8/24 | 8/11 | 7.3/11 | 10 | 5.8/24 | 8.2/24 | 8.2/10 | 7.5/10 | 15 | 4.7/24 | 8.2/24 | 3.1/10 | 4.9/10 | 20 | 4.3/24 | 8/24 | 3/10 | 5/10 | 25 | 3.1/24 | 7.9/24 | 2.9/10 | 5.1/10 | 30 | 2/24 | 7.8/24 | 2.9/10 | 5.4/10 | Table 2 | ml/ 5minutes | Ml/5minutes | Ml/minutes | Ml/5 minutes | Time | Room temperature bean | Room temperature glass | Cold temperature bean | Cold temperature glass | Initial | 3.9/25 | 1.8/25 | 1.8/11 | 2.5/11 | 5 | 4/24 | 2/24 | 2/11
Put a few iron filings back into the 100 mL beaker. 17. One lab partner should take the magnet to the back table and put the iron filings into the blue tray. 18. The other lab partner should add the 20 mL water to the 100 mL beaker and stir for one minute.
Repeat step two, then continue adding 5 dry pennies each step to balance until you have used all 30 pennies 4. Fill Graduated cylinder with 20mL of distilled water 5. Drop 5 pennies (one at a time), into the graduated cylinder and record new volume 6. Repeat adding 5 pennies each time and record 7. Record Data in Notebook 8.
Materials & Methods Materials: · Scale · 4 6” Dialysis Tubing · 4 Transfer Pipets · Sugar · Scissors · Rubber Bands · 4 Same-Sized Coffee Cups · 250ml Graduated Cylinder · Tape Measure · Sauce Pan · 3 600ml Containers · Plastic Covering · Spoon Methods: 1.) Place 4 6” pieces of dialysis tubing into coffee cups full of tap with and leave them for two hours prior to beginning the experiment. 2.) As you wait, prepare your three sugar solutions. For the first solution, pour 5 grams of sugar into 250ml graduated cylinder and add water up to the 250ml mark.
Whenever you record the volume, record to the nearest 0.01mL. Do this six times. Data: Trial # Volume of water after addition of metal m(L). Mass of the container and metal (g). 1 5.24 mL 10.061 g 2 5.49 mL 9.293 g 3 5.99 mL 8.055 g 4 6.51 mL 6.647 g 5 7.02 mL 5.189 g 6 7.51 mL 3.932 g Calculation: Error: Our percent error was -0.37%.
Add water to your graduated cylinder until you have exactly 50ml (this is your volume). 3. Find the weight of the water plus the cylinder and record in your data table. 4. Find the weight of only the water by subtraction.