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i. Test tube 25.250g Mass of Sample: Sample + tube: 26.6939 ii. Mass of Copper: iv. 1.15g 26.400g-25.250g = 1.15g 0.2939 Copper + Test 26.400g iii. Mass of Oxygen: 1.44 3g 26.693-26.400g = 0.2939 Determine the percentage of Cu and Oxygen present in the SAMPLE % Cu: _% O:

i. Test tube 25.250g Mass of Sample: Sample + tube: 26.6939 ii. Mass of Copper: iv. 1.15g 26.400g-25.250g = 1.15g 0.2939 Copper + Test 26.400g iii. Mass of Oxygen: 1.44 3g 26.693-26.400g = 0.2939 Determine the percentage of Cu and Oxygen present in the SAMPLE % Cu: _% O:

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Chem 105-Online Prelab: 1. Why does unpopped popcorn pop when heated? aid in of wat 2. Please Unpopped popcorn. pops. pps when heated because the pressure inside the Kerne is builds. watch the video of the chemical analysis for the percent composition of a metal oxicking ease watch the vid for com This eventually makes the crack, (save this data as you will use it for an upcoming prelab as well). Note that you will need to minc all work, units, and sig figs. 1.4439 Procedure: i. ii. iii. iv. Test tube 25.250g 2.00 26.6939 1.15g Mass of Sample: Sample & tube: Mass of Copper: Copper + Test 26.400g 26.400g-25.250g = 1.15g 0.2939 Mass of Oxygen: 26.693-26.400g = 0.2939 Cher Determine the percentage of Cu and Oxygen present in the SAMPLE % Cu: % O: ita 1. Measure approximately 3-5mL of household cooking oil (either olive or vegetable oil) in a beaker(just has to be enough to cover the popcorn kernels). 2. Grab a small square of tin foil and place on the top of the beaker. You will want to ensure that this is on top so the kernel do NOT pop out. Record in the data table. 3. Obtain 20 popcorn kernels and place inside the beaker and record the new mass with the lid on. 4. Once your masses from (1) and (2) are determined, start heating the beaker on top of your designated pan for Chemistry. Once kernels begin to pop, softly shake/agitate the beaker to prevent burning. DO NOT BURN THE POPCORN. 5. After the kernels finish popping, remove the beaker from the heating element and immediately remove the lid so the contents can cool. Think why you would want the lid to be off in this situation when the system is cooling. a. If there are water droplets that have condensed on the walls of the beaker, gently wipe them off with a paper town but do not wipe any oil as it is massed. If there are water droplets on the foil ploger
Transcribed Image Text:Chem 105-Online Prelab: 1. Why does unpopped popcorn pop when heated? aid in of wat 2. Please Unpopped popcorn. pops. pps when heated because the pressure inside the Kerne is builds. watch the video of the chemical analysis for the percent composition of a metal oxicking ease watch the vid for com This eventually makes the crack, (save this data as you will use it for an upcoming prelab as well). Note that you will need to minc all work, units, and sig figs. 1.4439 Procedure: i. ii. iii. iv. Test tube 25.250g 2.00 26.6939 1.15g Mass of Sample: Sample & tube: Mass of Copper: Copper + Test 26.400g 26.400g-25.250g = 1.15g 0.2939 Mass of Oxygen: 26.693-26.400g = 0.2939 Cher Determine the percentage of Cu and Oxygen present in the SAMPLE % Cu: % O: ita 1. Measure approximately 3-5mL of household cooking oil (either olive or vegetable oil) in a beaker(just has to be enough to cover the popcorn kernels). 2. Grab a small square of tin foil and place on the top of the beaker. You will want to ensure that this is on top so the kernel do NOT pop out. Record in the data table. 3. Obtain 20 popcorn kernels and place inside the beaker and record the new mass with the lid on. 4. Once your masses from (1) and (2) are determined, start heating the beaker on top of your designated pan for Chemistry. Once kernels begin to pop, softly shake/agitate the beaker to prevent burning. DO NOT BURN THE POPCORN. 5. After the kernels finish popping, remove the beaker from the heating element and immediately remove the lid so the contents can cool. Think why you would want the lid to be off in this situation when the system is cooling. a. If there are water droplets that have condensed on the walls of the beaker, gently wipe them off with a paper town but do not wipe any oil as it is massed. If there are water droplets on the foil ploger
Expert Solution
Step 1

Given mass of the sample is 1.443 g

Mass of copper in the sample is 1.15 g

Mass of oxygen in the sample is 0.293 g

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