Density

<body topmargin=0 leftmargin=0 marginheight=0 marginwidth=0> <table cellpadding=0 cellspacing=0 border=0><tr> <td valign="top" colspan=2 height=90 BGCOLOR="#CC9900" TEXT="#080000" bgproperties="fixed" background="070005a0dwnjzk.png"> <div> <A HREF="lesson5.htm" TARGET="_top" TITLE="(Some) Physical Properties of Matter by "><U><B>home</B></U></A><B>     | </B><B> </B><B> </B><B>  </B><FONT SIZE="5" COLOR="#FFCC66" FACE="Arial" ><B>(Some) Physical Properties of Matter by Carl Martikean</B></FONT></div> <div> <A HREF="id32.htm" TARGET="_top" TITLE="Mass"><U><B>Mass</B></U></A><B>   |   </B><A HREF="id33.htm" TARGET="_top" TITLE="Volume"><U><B>Volume</B></U></A><B>   |   </B><B>Density</B><B>   |   </B><A HREF="id36.htm" TARGET="_top" TITLE="Boiling Point"><U><B>Boiling Point</B></U></A><B>   |   </B><A HREF="id35.htm" TARGET="_top" TITLE="Melting Point"><U><B>Melting Point</B></U></A><B>   |   </B><A HREF="id37.htm" TARGET="_top" TITLE="Specific Heat"><U><B>Specific Heat</B></U></A></div> <div> </div> </td> </tr><tr> <td valign="top" width=210 BGCOLOR="#FFFFFF" TEXT="#080000"> <div> Density</div> <div> <A HREF="id34_m.htm#experiment_1" TARGET="TRLX_Middle" TITLE="Density"><U><B>Experiment 1</B></U></A></div> <div> <A HREF="id34_m.htm#experiment_2" TARGET="TRLX_Middle" TITLE="Density"><U><B>Experiment 2</B></U></A></div> </td> <td valign="top" height=390 BGCOLOR="#FFFFFF" TEXT="#080000"> <div> Back to <A HREF="id22.htm" TARGET="_top" TITLE="Exercise"><U>Exercise</U></A>     Back to <A HREF="lesson5.htm" TARGET="_top" TITLE="(Some) Physical Properties of Matter by "><U>Home</U></A></div> <bR> <div> <B> <A NAME="experiment_1"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="1" ALIGN="bottom" WIDTH="1" HSPACE="0" VSPACE="0" ></A></B><B>Experiment 1</B></div> <bR> <div> <B>A Graphical Determination    </B></div> <div> <B>     </B><FONT SIZE="3" COLOR="#000000" FACE="Tahoma" ><B>of Density</B></FONT></div> <bR> <div> <TABLE BORDER="0" CELLPADDING="2" CELLSPACING="1" WIDTH="755" BORDERCOLORLIGHT="#C0C0C0" BORDERCOLORDARK="#808080" FRAME="VOID" RULES="NONE" HSPACE="0" VSPACE="0" > <tR> <tD VALIGN=TOP HEIGHT= 1311 WIDTH="351"><div> Density is mass per unit volume. The mass of</div> <div> any size sample of a material divided by the</div> <div> volume of that sample will give the density of</div> <div> that material. A good scientist would not be</div> <div> satisfied, however, with a value based on one</div> <div> set of measurements. A more accurate value is</div> <div> found by averaging the results of several ex-</div> <div> periments.</div> <bR> <div> Another approach is the use of a graphical method to find an average value. The purpose of this experiment is to determine the density of metal shot by a graphical method.</div> <bR> <div> <B>Objectives</B></div> <div> • <B>Use significant </B>digits in making measure</div> <div>      ments and in calculations.</div> <div>      <B>Graph </B>a series of laboratory measure</div> <div>      ments.</div> <div> • <B>Determine </B>density from a mass vs. volume</div> <div>      graph.</div> <div> <B>Materials</B></div> <div> <B>     </B>differentsized samples of the same metal</div> <div>           shot (BBs), 4 samples</div> <div>      100cm3 graduated cylinder</div> <div>      30cm 3 beaker</div> <div>      balance</div> <div>      water</div> <bR> <div> <B>Procedure</B></div> <div> Work in teams of four. Each student should</div> <div> carry out the following procedure for a differ-</div> <div> entsized sample of the metal shot.</div> <div> 1.     Mass the beaker to the nearest 0.01 g.  Record the mass in a data table like the one shown.</div> <bR> <div> 2.     Place your shot in the beaker and mass  them together. Record this mass.</div> <bR> <div> 3.     Subtract the mass of the beaker from the  mass of the beaker + shot to obtain the mass of the shot sample. Record this mass.</div> <bR> <div> 4.    Halffill the 100cm3 graduated cylinder with tap   water. Determine and record this volume of water to the nearest 0.5 cm<FONT SIZE="1" COLOR="#000000" FACE="Arial" >3 </FONT></div> <bR> <DIV ALIGN="LEFT"></DIV> <div> <IMG SRC="0839bd00.png" border=0 width="155" height="208" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <bR> <div> 5.    Slowly pour the metal shot into the water in the graduated cylinder. Record the new volume to the nearest 0.5 cm<FONT SIZE="1" COLOR="#000000" FACE="Arial" > 3</FONT>.</div> <bR> <div> <FONT SIZE="3" COLOR="#000000" FACE="Arial" >6.  </FONT> Slowly pour off the water into the sink. Place the wet metal shot between two layers of paper towels and dry the shot before returning it to your teacher.</div> <bR> <div> 7. Share your data with your lab team and record their data in the other columns of your data table.</div> <bR> <bR> <bR> <bR> <bR> </tD> <tD VALIGN=TOP WIDTH="393"><div> <B>Data and Observations</B></div> <div> <TABLE BORDER="2" CELLPADDING="1" CELLSPACING="1" WIDTH="322" BORDERCOLORLIGHT="#C0C0C0" BORDERCOLORDARK="#808080" FRAME="BOX" RULES="ALL" HSPACE="0" VSPACE="0" > <tR> <tD VALIGN=TOP HEIGHT= 19 WIDTH="172"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="19" ALIGN="bottom" WIDTH="172" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP COLSPAN=4 WIDTH="129"><div> Trial</div> </tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 19 WIDTH="172"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="19" ALIGN="bottom" WIDTH="172" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP WIDTH="30"><div> 1</div> </tD> <tD VALIGN=TOP WIDTH="30"><div> 2</div> </tD> <tD VALIGN=TOP WIDTH="30"><div> 3 </div> </tD> <tD VALIGN=TOP WIDTH="30"><div> 4</div> </tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 19 ><NOBR><div> Mass of beaker + shot</div> </NOBR></tD> <tD VALIGN=TOP WIDTH="30"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="19" ALIGN="bottom" WIDTH="30" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP WIDTH="30"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="19" ALIGN="bottom" WIDTH="30" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP WIDTH="30"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="19" ALIGN="bottom" WIDTH="30" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP WIDTH="30"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="19" ALIGN="bottom" WIDTH="30" HSPACE="0" VSPACE="0"></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 19 ><NOBR><div> Mass of empty beaker</div> </NOBR></tD> <tD VALIGN=TOP WIDTH="30"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="19" ALIGN="bottom" WIDTH="30" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP WIDTH="30"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="19" ALIGN="bottom" WIDTH="30" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP WIDTH="30"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="19" ALIGN="bottom" WIDTH="30" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP WIDTH="30"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="19" ALIGN="bottom" WIDTH="30" HSPACE="0" VSPACE="0"></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 19 ><NOBR><div> Mass of metal shot (y)</div> </NOBR></tD> <tD VALIGN=TOP WIDTH="30"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="19" ALIGN="bottom" WIDTH="30" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP WIDTH="30"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="19" ALIGN="bottom" WIDTH="30" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP WIDTH="30"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="19" ALIGN="bottom" WIDTH="30" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP WIDTH="30"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="19" ALIGN="bottom" WIDTH="30" HSPACE="0" VSPACE="0"></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 35 ><NOBR><div> Total volume of</div> <div> water + metal shot</div> </NOBR></tD> <tD VALIGN=TOP WIDTH="30"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="35" ALIGN="bottom" WIDTH="30" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP WIDTH="30"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="35" ALIGN="bottom" WIDTH="30" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP WIDTH="30"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="35" ALIGN="bottom" WIDTH="30" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP WIDTH="30"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="35" ALIGN="bottom" WIDTH="30" HSPACE="0" VSPACE="0"></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 35 WIDTH="172"><div> Initial volume of</div> <div> water in cylinder</div> </tD> <tD VALIGN=TOP WIDTH="30"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="35" ALIGN="bottom" WIDTH="30" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP WIDTH="30"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="35" ALIGN="bottom" WIDTH="30" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP WIDTH="30"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="35" ALIGN="bottom" WIDTH="30" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP WIDTH="30"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="35" ALIGN="bottom" WIDTH="30" HSPACE="0" VSPACE="0"></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 19 ><NOBR><div> Volume of metal shot (x)</div> </NOBR></tD> <tD VALIGN=TOP WIDTH="30"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="19" ALIGN="bottom" WIDTH="30" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP WIDTH="30"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="19" ALIGN="bottom" WIDTH="30" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP WIDTH="30"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="19" ALIGN="bottom" WIDTH="30" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP WIDTH="30"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="19" ALIGN="bottom" WIDTH="30" HSPACE="0" VSPACE="0"></tD> </tR> </TABLE></div> <bR> <div> <B>Analysis and Conclusions</B></div> <bR> <div> 1.     For each trial, subtract the initial volume of water from the total volume of water + shot. Record the resulting values for the volume of the shot in cm3</div> <div> 2.     Using graph paper, plot the mass of the metal shot on the yaxis and the volume of the metal shot on the xaxis. Locate and mark four points. Draw a straight line that passes through as many points as possible. Points may fall on either side of the line due to experimental error.</div> <div> 3.     Determine the x and y values of two points on the line.             Calculate the slope, m, of the line by using the following equation:</div> <bR> <DIV ALIGN="LEFT"></DIV> <div> m = <U>(y</U><FONT SIZE="1" COLOR="#000000" FACE="Arial" ><U>2</U></FONT><U> </U><FONT SIZE="1" COLOR="#000000" FACE="Bookman Old Style" ><U>- </U></FONT><U>y</U><FONT SIZE="1" COLOR="#000000" FACE="Arial" ><U>1</U></FONT><FONT SIZE="1" COLOR="#000000" FACE="Bookman Old Style" ><U>)</U></FONT></div> <div>          (<FONT SIZE="2" COLOR="#000000" FACE="Arial" >x</FONT><FONT SIZE="1" COLOR="#000000" FACE="Bookman Old Style" >2</FONT>- X<FONT SIZE="1" COLOR="#000000" FACE="Bookman Old Style" >I</FONT>)</div> <bR> <div> The slope is equal to the average density for all four trials. Record this average density.</div> <div> 4.     Determine and record the density from the mass and volume found in your own trial</div> <bR> <DIV ALIGN="LEFT"></DIV> <div> Density = <U>mass of metal shot </U></div> <div>                   volume of metal shot</div> <bR> <div> 5.     How does the density from your own trial compare with the average density found from the slope of the plot?</div> <bR> <div> <B>Extension and Application</B></div> <bR> <div> 1<B>.     </B>How many significant digits did you record in the density calculated for your trial? Explain how you decided on this number of digits.</div> <div> 2.     The percent error for each trial is the absolute value of the difference between the density from the trial and the average density, divided by the average density. Calculate your percent error.</div> <bR> <div> % error =  <U>density from trial -average, density    </U><FONT SIZE="1" COLOR="#000000" FACE="Bookman Old Style" >X </FONT>100 </div> <div>                               average density</div> <bR> <div> 3.     How could the experiment be changed to decrease the experimental error?</div> <bR> <div> 4.     Suppose you wanted to use a graphical method to find the number of miles your car can travel on a gallon of gasoline. Briefly describe a procedure you could use.</div> </tD> </tR> </TABLE></div> <div>  <HR>  </div> <div> <B> <A NAME="experiment_2"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="1" ALIGN="bottom" WIDTH="1" HSPACE="0" VSPACE="0" ></A></B><B>Experiment 2</B></div> <bR> <div> <B>Aluminum Foil Thickness</B></div> <bR> <div> <B> <TABLE BORDER="0" CELLPADDING="2" CELLSPACING="1" WIDTH="691" BORDERCOLORLIGHT="#C0C0C0" BORDERCOLORDARK="#808080" FRAME="VOID" RULES="NONE" HSPACE="0" VSPACE="0" > <tR> <tD VALIGN=TOP HEIGHT= 1271 WIDTH="333"><div> How thick is aluminum foil in centimeters? How many atoms thick is this? The small size of any one atom gives a clue to the relatively large number of atoms in a sample of matter that we can pick up and measure. The purpose of this activity is to relate the size of an aluminum atom to the thickness of a piece of aluminum foil.</div> <bR> <div> <B>Objectives</B></div> <bR> <div> • <B>Determine </B>the density of aluminum.</div> <div> • <B>Compute </B>the thickness of aluminum foil.</div> <div> • <B>Use</B> the factorlabel method correctly.</div> <bR> <div> <B>Materials </B></div> <div> string scissors         250cm<FONT SIZE="1" COLOR="#000000" FACE="Arial" >3</FONT> graduated cylinder </div> <div> water                                 aluminum block   </div> <div> metric ruler                         aluminum foil</div> <div>  </div> <div> <B>Procedure</B></div> <bR> <div> 1.     Form a hypothesis<B> </B>as to what directly observable data are necessary to compute the thickness of a piece of aluminum foil in centimeters.</div> <bR> <div> 2.     Mass the block or cylinder of aluminum metal. Record the mass in grams in a data table like the one shown.</div> <bR> <div> .3.     Fill a 250cm<FONT SIZE="1" COLOR="#000000" FACE="Arial" >3</FONT> graduated cylinder with</div> <div>      water to the 100cm<FONT SIZE="1" COLOR="#000000" FACE="Arial" >3</FONT> mark.</div> <bR> <div> 4.     Tie a string to the aluminum block or cylinder and lower it into the water in the graduated cylinder until it is completely immersed. Read and record the new volume of water. Compute and record the volume of the aluminum.</div> <bR> <div> 5.     Remove the aluminum block from the water,  dry it, and return it to your teacher.</div> <bR> <div> 6.     Cut a piece of aluminum foil approximately 12 cm x 12 cm.</div> <bR> <div> 7.     Measure and record the length and width of the piece of aluminum foil to the nearest 0.1 cm.</div> <bR> <div> 8.     Mass the piece of aluminum foil and</div> <div>      record your result.</div> <bR> <div> <B>Data and Observations</B></div> <div> <TABLE BORDER="2" CELLPADDING="1" CELLSPACING="1" WIDTH="317" BORDERCOLORLIGHT="#C0C0C0" BORDERCOLORDARK="#808080" FRAME="BOX" RULES="ALL" HSPACE="0" VSPACE="0" > <tR> <tD VALIGN=TOP HEIGHT= 19 ><NOBR><div> A. Mass of piece of aluminum (g)</div> </NOBR></tD> <tD VALIGN=TOP WIDTH="67"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="19" ALIGN="bottom" WIDTH="67" HSPACE="0" VSPACE="0"></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 18 ><NOBR><div> B. Volume of water in cylinder</div> </NOBR></tD> <tD VALIGN=TOP><NOBR><div> 100 cm<FONT SIZE="1" COLOR="#000000" FACE="Arial" >3</FONT></div> </NOBR></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 35 WIDTH="235"><div> C. Volume of water plus aluminum (cm<FONT SIZE="1" COLOR="#000000" FACE="Arial" >3</FONT><FONT SIZE="1" COLOR="#000000" FACE="Tahoma" > </FONT>)</div> </tD> <tD VALIGN=TOP WIDTH="67"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="35" ALIGN="bottom" WIDTH="67" HSPACE="0" VSPACE="0"></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 35 WIDTH="235"><div> D. Volume of piece of aluminum (cm<FONT SIZE="1" COLOR="#000000" FACE="Tahoma" >3</FONT><FONT SIZE="1" COLOR="#000000" FACE="Tahoma" >) </FONT>(C - B)</div> </tD> <tD VALIGN=TOP WIDTH="67"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="35" ALIGN="bottom" WIDTH="67" HSPACE="0" VSPACE="0"></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 19 ><NOBR><div> E. Length (l) of aluminum foil (cm)</div> </NOBR></tD> <tD VALIGN=TOP WIDTH="67"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="19" ALIGN="bottom" WIDTH="67" HSPACE="0" VSPACE="0"></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 19 ><NOBR><div> F. Width (w) of aluminum foil (cm)</div> </NOBR></tD> <tD VALIGN=TOP WIDTH="67"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="19" ALIGN="bottom" WIDTH="67" HSPACE="0" VSPACE="0"></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 19 ><NOBR><div> G. Mass of aluminum foil (g)</div> </NOBR></tD> <tD VALIGN=TOP WIDTH="67"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="19" ALIGN="bottom" WIDTH="67" HSPACE="0" VSPACE="0"></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 35 WIDTH="235"><div> H. Density of aluminum (A/C) (g/cm<FONT SIZE="1" COLOR="#000000" FACE="Arial" >3</FONT>)</div> </tD> <tD VALIGN=TOP WIDTH="67"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="35" ALIGN="bottom" WIDTH="67" HSPACE="0" VSPACE="0"></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 19 ><NOBR><div> I. Volume of foil (cm<FONT SIZE="1" COLOR="#000000" FACE="Arial" > 3</FONT>) (G/H)</div> </NOBR></tD> <tD VALIGN=TOP WIDTH="67"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="19" ALIGN="bottom" WIDTH="67" HSPACE="0" VSPACE="0"></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 19 ><NOBR><div> J. Height (thickness) of foil (cm)</div> </NOBR></tD> <tD VALIGN=TOP WIDTH="67"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="19" ALIGN="bottom" WIDTH="67" HSPACE="0" VSPACE="0"></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 19 ><NOBR><div> K. Moles of aluminum in foil</div> </NOBR></tD> <tD VALIGN=TOP WIDTH="67"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="19" ALIGN="bottom" WIDTH="67" HSPACE="0" VSPACE="0"></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 19 ><NOBR><div> L. Atoms of aluminum in foil</div> </NOBR></tD> <tD VALIGN=TOP WIDTH="67"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="19" ALIGN="bottom" WIDTH="67" HSPACE="0" VSPACE="0"></tD> </tR> </TABLE></div> <bR> </tD> <tD VALIGN=TOP WIDTH="347"><div> <B>Analysis and Conclusions</B></div> <bR> <div> 1.     What is the purpose of the aluminum</div> <div>      block or cylinder?</div> <div> 2.     Determine the density of aluminum and</div> <div>      record it in your data table.</div> <bR> <DIV ALIGN="LEFT"></DIV> <div> Density = mass (A)/volume (D)</div> <bR> <div> 3.     Find the volume of the foil and record it in</div> <div>      cubic centimeters.</div> <bR> <DIV ALIGN="LEFT"></DIV> <div> Volume=   <U>mass in g (G)</U></div> <div>                                             density in g/cm<FONT SIZE="1" COLOR="#000000" FACE="Arial" >3</FONT> (H)</div> <bR> <DIV ALIGN="LEFT"></DIV> <div> <IMG SRC="086dce90.jpg" border=0 width="220" height="233" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <bR> <div> 4.     Find the height (thickness) of the foil <FONT SIZE="3" COLOR="#000000" FACE="Arial" ><I>(h)</I></FONT></div> <div> <I>     </I><FONT SIZE="2" COLOR="#000000" FACE="Arial" >in cm from the relation</FONT></div> <DIV ALIGN="LEFT"></DIV> <div> <I>Volume = l x w x h</I></div> <div> and record the result. Was your hypothesis about the data needed to compute the height of the foil correct?</div> <bR> <div> 5.   One aluminum atom is 2.5 x 10g cm thick. Find the thickness of the foil in atoms, which is given by</div> <bR> <div> Number of     = height (I)  x   1 atom / 2.5 x10<FONT SIZE="1" COLOR="#000000" FACE="Arial" >-8</FONT> cm</div> <div> Atoms thick       </div> <bR> <div> 6.     Compute the number of moles of aluminum and the total number of atoms of aluminum in your piece of aluminum foil.</div> <bR> <div> <B>Extension and Application</B></div> <div> If the population of the world is 5.6 x 10<FONT SIZE="1" COLOR="#000000" FACE="Arial" >9</FONT> individuals, how many atoms of aluminum could you distribute to each person from your sample of aluminum foil?                   </div> </tD> </tR> </TABLE></B></div> <bR> </td> </tr></table></body>