Lab 1- CHM2045L Tiffany F PDF

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Florida Atlantic University *

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2045L

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Chemistry

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Jul 2, 2024

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Uploaded by ElderReindeer4439

Lab 1 – Iden+fica+on of Metals – Lab Report C H M 2 0 4 5 L - D r. Ya v u z Pe t r o w s k i The statement is: ! I cer/fy that this is my own work and I understand that if I am found to be in viola/on of the honor code, I will be subject to the highest penalty” Name: Tiffany Francois Znumber: Z23813167 PART I: 360 SIMULATION Table 1. Determining the Densi/es. Please complete data table by using 360 virtual lab simula+on. Only obser- va+ons based on the 360 video results will be accepted as correct answer. Be sure to record your measurements with the appropriate number of significant figures. You must show all your calcula+ons to receive credit for them. You must type your answers for each sec+on. HandwriCen reports will not be accepted or will be graded with 4 points deduc/on. By using simula/on, record: a. Mass of the unknown metal sample b. Volume of the unknown metal Complete c. Density calcula+on of the unknown metal d. Plot excel graph to find the density e. Calculate average density Data Points Collected Unknown Metal #1 Unknown Metal #2 Unknown Metal #3 Unknown Metal #4 Mass of weighing dish, g 2.027g 2.019g 2.119g 1.953g Mass of weighing dish and un- known metal sample, g 4.524g 5.743g 9.821g 13.947g Mass of unknown metal sample, g 2.223g 3.724 g 7.702g 11.994g Volume of water, mL 5.00ml 5.00ml 5.00ml 5.00ml Volume of water and metal, mL 5.32ml 5.48ml 6.00ml 6.6ml Volume of unknown metal sample, mL .32ml .48ml 1.0ml 1.6ml

Calcula/ons : YOU MUST SHOW ALL CALCULATIONS TO RECEIVE CREDIT FOR THEM ! Calcula+ons needs to be typed Proper use of significant figures and units is part of the grading. Mass g of the unknown metal 1: 4.25g-2.027g Calcula+on: 4.25g-2.027g= 2.223g (mass g of unknown metal 1) Mass g of unknown sample 2: 5.743g- 2.019g Calcula+on aeer subtrac+on: 3.724g (mass g of unknown metal 2) Mass g of unknown sample 3: 9.812g - 2.119g Calcula+on aeer subtrac+on: 7.702g Mass g of unknown sample 4: 13.947g-1.953g Calcula+on aeer subtrac+on: 11.994g CALCULATING DENSITY: D (p)= M/V Density of unknown metal 1: 2.223/.32= 6.94g/ml Density of unknown metal 2: 3.724/ .48= 7.75 g/ml Density of unknown metal 3: 7.702/ 1.0= 7.702 g/ml Density of unknown metal 4: 11.994/ 1.6= 7.49 g/ml Average density: Density of metal sample, g/mL 6.94 g.ml 7.75 g/ml 7.702 g/ml 7.49 g/ml Average density value from calcu- la+on (g/mL) 7.47g/ml Density value from excel graph (g/ mL) 7.50g/ml Iden+fy of Metal Tin Data Points Collected Unknown Metal #1 Unknown Metal #2 Unknown Metal #3 Unknown Metal #4

Average = (Trial 1+Trial 2+Trial 3+Trial 4)/4=(6.94g/ml+7.75g/ml+7.702g/ml+7.49g/ml)/4 =7.47g/ml 360 Lab Graph Excel Graph : Edit your graph so that it contains the correct formaing components – you need a descrip+ve +tle and labels for your x- and y-axes (don’t forget units!). Add screenshots of your Excel graph. Make sure the graph is correctly formaked and labeled. To add screenshot: a. If you are on a Windows device, hold down ( Windows key ) + ( shiW ), then press ( s ). Use your mouse to draw a rectangle around your graph, then ( ctrl ) + ( v ) below to paste the image. b. If you are on a Mac, hold down ( cmd ) + ( shiW ), then press ( 4 ). Use your mouse to draw a rectangle around your graph. The image should be saved as a file on your desktop. Click and drag it below to paste it into the document.

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PART II: Table 1. Determining the Densi/es. Fill out the following table with your collected data. Your table should have 5 data entries for selected unknown metal. Be sure to record your measurements with the appropriate number of significant figures. Graduated Cylinder Used: ☐ 10 mL ☐ 25 mL ☐ 50 mL Unknown Metal: ☐ Metal 1 ☐ Metal 2 ☐ Metal 3 Data Points Collected Unknown Metal #1 Unknown Met- al #2 Unknown Met- al #3 Mass of weighing dish, g 4.6497g 5.8778g 4.7698g Mass of weighing dish and unknown metal sample, g 9.1543g 10.2754g 9.2056g Mass of unknown metal sample, g 4.5046g 4.3976g 4.4358g Volume of water, mL 5.00ml 5.00ml 5.00ml Volume of water and metal, mL 5.57ml 5.51ml 5.53ml Volume of unknown metal sample, mL 0.57ml 0.51ml 0.53ml Density of metal sample, g/ mL 7.90g/ml 8.62g/ml 8.37g/ml Average density value from calcula+on, g/mL 8.30g/ml Density value from excel graph 8.796g/ml Iden+ty of metal Copper

Calculations/work: Calculations: you must show all calculations to receive credit for them! Calculations needs to be typed. Proper use of significant figures and units is part of the grading. Mass of the unknown metal sample Mass of the unknown metal sample=Mass of weighing dish and unknown sample –Mass of weighing dish Unkown metal #1 =9.1543g-4.6497g=4.5046g Unkown metal #2 =10.2754g-5.8778g=4.3976g Unkown metal #3 9.2056g-4.7698g=4.4358g Volume of the unknown metal sample Volume of unknown metal sample=Volume of metal +water –Volume of water unknown metal #1 5.57ml-5.00ml=0.57ml unknown metal #2 5.51ml-5.00ml=0.51ml unknown metal #3 5.53ml-5.00ml=0.53ml Density of the unknown metal Density =Mass of the unknown metal sample/Volume of unknown metal sample unknown metal #1 =4.5046g/0.57ml=7.90g/ml unknown metal #2 =4.3976g/0.51ml =8.62g/ml unknown metal #3 4.4358g/0.53ml =8.37g/ml Average density

Average = (Trial 1+Trial 2+Trial 3…….)/3 =(7.90g/ml+8.62g/ml+8.37g/ml)/5=8.30g/ml Chemcollec/ve Graph

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Excel Graph : Edit your graph so that it contains the correct formaing components – you need a descrip+ve +tle and labels for your x- and y-axes (don’t forget units!). Add screenshots of your Excel graph. Make sure the graph is correctly formaked and labeled. To add screenshot: c. If you are on a Windows device, hold down ( Windows key ) + ( shiW ), then press ( s ). Use your mouse to draw a rectangle around your graph, then ( ctrl ) + ( v ) below to paste the image. d. If you are on a Mac, hold down ( cmd ) + ( shiW ), then press ( 4 ). Use your mouse to draw a rectangle around your graph. The image should be saved as a file on your desktop. Click and drag it below to paste it into the document.

PART III: COLLECTING INFORMATION USING THE “PERIODIC TABLE LIVE!” SOFTWARE 1. Using the soeware collect the following informa+on about the metals. DISCUSSION QUESTIONS 1. According to the results you have received from 360 Lab, which way turned out to be the most accurate to deter- mine the density of the metal, calcula+on from a single data point, or the computer created graph? What do you think, why? The most accurate way to evaluate the density of metal was the plocng of a graph .This is because a graph yields an exact value unlike calcula/ons which lead to uncertain/es as a result of calcula/on errors. 2. When you placed the metal in the graduated cylinder containing water, the metal sank. What did this tell you about the metal? This suggested that the density of metal is greater than that of water. 3. If you had used a different amount (mass) of your unknown metal, would the density you obtained be the same or different? Explain. If a different mass of the same unknown metal was used, the density obtained would be the same, provided the volume measurement is accurate. The density of a substance is an intrinsic property that remains constant regardless of the sample size or mass used in the calculation. NAME OF METAL DENSITY (g/mL) Copper 8.96 Silver 10.49 Aluminum 2.70 Platinum 21.45 Zinc 7.14 Rhodium 12.45 Tin 7.31