03 Mc Coy Amber - CHE 111 Lab PDF

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CHE 111 Lab...

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Amber McCoy CHE 111-001 TA: Tempany Arbogast March 4th, 2021 Determining Density of Aluminum Foil In order for us to be able to find the density of a piece of aluminum foil, we first need to understand what density is and we also have to know what the formula is for finding density. Density is defined as the mass of a unit volume and the formula to find density is D=m/v. There are also several different types of ways to measure density. One of them being on a graph and one of them is measuring density based on displacement. Procedure: 1. In order for us to get this experiment started, we first need to enter the chemistry lab and put on our personal protective equipment (i.e. goggles, gloves and our lab coats or aprons). 2. We then need to make sure that we have the appropriate equipment in order for us to be able to complete this lab. The equipment that we will need for this lab is an analytical balance, a 50mL graduated cylinder, a 50mL beaker, a ruler and a stir rod just in case. 3. Our first step of the actual experiment part is getting out our analytical balance and setting it on the workbench. We need to make sure that our scale is set to zero. 4. We then need to get out our 50mL graduated cylinder and set it on the scale. We must make sure that we write down the initial mass of the graduated cylinder. Another thing we must include when writing down the mass is all of the numbers, whether they are placeholder zeros or not. 5. We then need to measure a sheet of aluminum foil by using the ruler. 6. Our next step is to fill the beaker with exactly 20mL of water. Check the meniscus to verify that it is sitting at exactly 20mL. Record this into your laboratory notebook. 7. Our next step would be to put the sheet of aluminum foil into the graduated cylinder and record the weight of the graduated cylinder with the aluminum foil into our laboratory notebooks. 8. Next, we have to find the volume of the sheet of aluminum foil by using water displacement. 9. To determine the displacement, you must roll the aluminum foil into a ball and submerge it into 20mL of water. To make sure the aluminum foil is fully submerged, we can push down on it with the stirring rod. 10. Record the level of the meniscus into your laboratory notebook. When recording the meniscus, take into careful consideration where the meniscus is. If it is between two hash marks, use significant figures to determine the final meniscus. Take into consideration that in most of these situations, three significant figures are recorded.

Amber McCoy CHE 111-001 TA: Tempany Arbogast March 4th, 2021 11. We then need to use the formula for density to determine the density of this sheet of aluminum foil. This is going to be where you use your knowledge of chemistry to determine the foil’s total density. 12. In order to make sure we have done the experiment properly, we need to repeat these steps two more times to make sure we are both precise and accurate. 13. After we are finished, we need to put our waster in the appropriate waste receptacle and then place our dirty glassware into the sink. 14. Finally, we need to make sure that we place the analytical balance back on to the equipment shelf and also put our aluminum foil away in the proper cabinet....