Blessing F_Lab 4_graded (1)

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CHM138LL Lab 4 The Atomic Mass of Beanium and Using the Periodic Table Lab Name: Blessing friday_ 187/200 _____________ Procedures Pre-weighed packets of kidney beans, pinto beans, and black=eyed peas which are included in your lab kit will be used in this lab. Part I 1. Convert the masses of each isotopic sample (kidney and pinto beans, and black-eyed peas) to milligrams, and record these values in the data table (below). 2. Then, because each isotopic particle varies in size (unlike the isotopes of real elements, which vary only by mass), count the number or quantity of each isotope, and record in the data table. How many of each particle do you have? 3. Next, find the average mass for a single particle of that particular isotope. To determine the average mass of an individual particle of an isotope (for example, the kidney beans), you will have to divide the total mass of all particles of that isotope (the total mass of kidney beans you have) by the total quantity of particles of that isotope (the number of kidney beans you have). Use the following formula as illustrated using "kidneybeanium:" Average mass = mass of all kidneybeanium particles number of particles of kidneybeanium 4. From the counts/quantities of each isotope, determine the relative abundance of each isotope. Use the following formula to calculate relative abundance for each isotope illustrated using kidneybeanium: Relative abundance = # of particles of kidneybeanium total # of particles of all isotopes 5. The average mass and relative abundance will be used to determine the relative weight of each isotope. Use the following formulas to calculate average mass, relative abundance, and relative weights for each isotope, as illustrated below for kidneybeanium: a) Relative weight: (average mass of kidneybeanium) x (relative abundance of kidneybeanium)

b) Use the relative weight calculations to solve for the atomic mass of beanium (Bn). To solve for the atomic mass of all isotopes of beanium, add the column of relative weights of the individual isotopes together. Enter your data in the table along with sample calculations of each step (8 pts): 8/8 Sample Mass (mg) Number/Qty Average Mass Relative Abundanc e Relative Weight (mg) Kidneybeanium 1660 mg 3 553 .33 mg 0.21 116 .20 mg Pintobeanium 2830 mg 6 471 .67 mg 0.43 202 .81 mg Blackeyedpeaiu m 1110 mg 5 222 mg 0.36 79.9 2 mg Beanium (total) 398.93 Show at least one sample calculation for each of the above in the space below (8 pts): 7/ 8 - Kidney bean mass in mg : 1.66g x 1000mg/ 1g = 1,660 mg – Kidney bean average mass : 1,660mg / 3 = 553 .33 mg 3 sig. fig because the original mass has 3 sig. figs - Kidney bean relative abundance : 3/14 = 0.21 √ - Kidney bean relative weight : ( 553 .33 ) x ( 0.21 ) = 116 .20 mg - Atomic mass: 116.20 mg + 202.81mg + 79.92mg = 398.9 3 mg

Part II Naming and formula writing are crucial to a chemist (or chemistry student). This portion of the lab will allow you to enhance your naming and formula writing abilities while you learn about common household substances and what chemicals they contain. For each of the following ionic and covalent substances, write either the name or the formula for the compound (24 pts): 23/24 Chemical Name Chemical Formula Common Use 1 Sodium Hydroxide NaOH Drain Cleaner 2 Sodium Bicarbonate NaHCO 3 Baking soda 3 Aluminum oxide Al 2 O 3 Sandblasting sand 4 Sodium Hypochlorite NaClO Bleach 5 Aluminum sulfate Al2(SO4)3 Used in antiperspirant 6 Ammonium bromide N H 4 Br Used in photography 7 Ammonium chloride NH4Cl Used in photography 8 Ammonium carbonate (NH4)2CO3 Smelling salts 9 Calcium Carbonate CaC O 3 Limestone/chalk 10 Sodium chloride NaCl Table Salt 11 Calcium chloride CaCl2 De-icer for snow on roads 12 Calcium hypochlorite Ca ( ClO ) 2 Swimming pool disinfectant 13 Ammonium nitrate N H 4 N O 3 Used in fertilizer 14 Ammonium phosphate (NH4)3PO4 Used in fertilizer

15 Calcium oxide CaO Used to make plaster 16 Carbon dioxide CO 2 Dry ice 17 Chromium (III) oxide Cr 2 O 3 Green pigment in paints 18 Copper (II) Sulfate copper has +1 and +2 ionic charge CuS O 4 Plant root killer 19 Iron(III) Chloride FeCl3 Etching solution 20 Magnesium carbonate MgCO3 Athlete’s chalk 21 Mg ( OH ) 2 Milk of Magnesia 22 Nitrogen dioxide NO2 Gas in whipped cream cans 23 Potassium nitrate KNO3 Saltpeter 24 KMnO 4 Used in water softeners Part III Dimitri Mendeleev put the periodic table together by writing information about the elements on note cards and arranging the note cards based on similarities and trends in the properties. In this activity, you will arrange fourteen known elements, and then, based on the properties listed, you will identify the three unknown elements. 1. Print out the set of Element Cards found at the bottom of this document for this activity. 2. Cut out the cards and arrange the known elements based on their locations on the periodic table. The knowns (and unknowns) are all from Groups 1A, 2A, 7A, and 8A on the Periodic Table. 3. Using the properties listed on the three unknown element cards, determine the proper location for each of the unknowns. 4. Determine the name of the unknown elements by comparing their location to the Periodic Table.

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