In this experiment the student will need a Bunsen burner, ring stand, wire gauze, pH meter, red cabbage, about seven small beakers (clean), seven test tubes, universal pH paper, both red and blue litmus paper, methyl red and several solutions provided by the instructor. First the student will prepare the red cabbage by filling a beaker with 50 mL of distilled water and placing about 1 gram of finely chopped red cabbage and boil for 10 minuets. Let the beaker cool and decant the solution from the cabbage. While the cabbage is boiling the student should continue with the rest of the experiment, pour about 2 mL into the beaker and test the pH with the pH meter, litmus papers, and universal pH paper and record. Pour half of the solution into a test tube and set aside. With the sample in the beaker add 2 drops of methyl red and record. With the solution in the test tube add a dropper full of the cabbage indicator and record. The student must do these steps with all of the solution provided for in this experiment.…
a. Dry ice (CO2) sublimes (changes from a solid to gas) at -78 ⁰C at standard atmospheric pressure.…
● Change: You do not need to collect each chemical in test tubes. For Steps 2-8:…
In this experiment we were wanting to find the specific heat of an unknown metal and determining what metal it was by using the formula q=c X m X change of temperature. We did two trials to compare the two and see what we come up with.…
The purpose of this experiment was to be able to apply our knowledge of chemistry to identify 10 unknown elements that were presented to us. We were allowed to use Bunsen burners, hydrochloric acid, use PH paper to test if the unknown solution is an acid or a base, and precipitate each unknown solution with each other.…
.2400 grams of the unknown compound. This is done in duplicate and purple-tinted precipitates are placed in Gooch crucibles. The precipitates are suction dried using ethyl alcohol then acetone to…
Obtain and wear goggles. 2. Measure and record the mass of a clean, dry crucible without cover. Obtain about 1 g of the unknown copper chloride hydrate and place it in the crucible. Use a spatula to break up any large pieces of the substance by pressing the pieces against the wall of the crucible. Measure and record the mass of the crucible with compound. 3. Set up a ring stand, ring, and clay triangle for heating the sample. Rest the crucible on the clay triangle. Set up a lab burner and ignite the burner away from the crucible. Adjust the burner to get a small flame. 4. Hold the burner in your hand and move the flame slowly back and forth underneath the crucible to gently heat the sample. Do not overheat the compound. Note the color change, from blue-green to brownish, as the water of hydration is driven out of the crystals. When the sample has turned brown, gently heat the crucible for two more minutes. 5. Remove and turn off the burner. Cover the crucible and allow the sample to cool for about ten minutes. 6. Remove the crucible cover and inspect your sample. If you see any blue-green crystals, reheat the sample until the crystals have turned brown. 7. Measure and record the mass of the cool crucible of your copper chloride sample. 8. Transfer the brown solid to a clean and empty 50 mL beaker. Rinse out the crucible with two 8 mL aliquots of distilled water and pour the water into the 50 mL beaker. Gently swirl the beaker to completely dissolve the solid. Note that the color of the solution is green as the copper ions are rehydrated. 9. Measure out about 20 cm of aluminum wire, coil the wire, and place the wire in the beaker of solution so that it is completely immersed in the copper chloride solution. Note that the reaction produces a gas, elemental copper is forming on the surface of the aluminum wire, and the color of the solution is fading. The reaction will take about 30 minutes to complete. 10. When the reaction is done, the solution will be colorless.…
determine acidity or basicity. Other reactions can be observed as well when different chemicals are…
Purpose: In this lab, I will observe macroscopic changes that occur when mixing together certain chemicals and household cleaners. The mixing of the chemicals provided with each other and with acid/base indicators demonstrates how matter can change, and how chemistry can be seen with the naked eye. By mixing household cleaners with an acid/base indicator I hope to demonstrate how these changes can be related to everyday life.…
- The food coloring + CH3COOH darkening in color, food coloring + NaOCI + CH3COOH returning to clear, red cabbage + NH3 turning green, red cabbage + CH3COOH turning pink, NaHCO3 + CH3COOH bubbling over, Na2CO3 + CH3COOH fizzing and turning cloudy, MgSO4 + NH3 turning white, and the MgSO4 + Na2CO3 becoming thick are all examples of macroscopic evidence for chemical change.…
Taking command of such a prestigious combat hardened unit, as is the 4th Armored Brigade Combat Team (ABCT), is truly an honor. I’m humbled at the opportunity and want to thank the outgoing command team for all that they’ve done. I believe the development of a leadership philosophy is a continuous ever changing process, comprised of life experiences and a person’s family upbringing. Although my personal leadership philosophy may change some overtime, the core aspects will remain the same.…
To learn how mixtures of compounds can be separated and what food dyes are found in certain foods…
11) Any part of a system with uniform composition and properties is called a _______.…
Women’s role in the church is continually debated. Scripture points to the idea that woman can be deacons and elders in the church. God created men and women equal and they should be treated as equals on earth. Therefore, women can be leaders in the church if that is what God has called them to do.…
We know that that the end point of the titration is reached when, after drop after careful drop of NaOH, the solution in the flask retains its pale pink color while swirling for about 30 seconds (as opposed to the pink color simply disappearing as the base mixes into the solution).…