Download Lab Quiz 1 with Answer Key -General College Chemistry | CHEM 101A and more Quizzes Chemistry in PDF only on Docsity!
dnrfE ,/ € KSior'l
Name:
Chem101. Lab (^) Quiz 1
10September 2009 R. Price
- Shownbelow is a graphobtainedby the sameprocedurethat you usedin Experiment2 to determinethe densityof an ethanolsolution.
a. Usethe graphto find the densityof the liquid. Show^ all of your work, please,and use thepropernumberof significantfigures. (4 pts.)
Total Mass vs. Total Volume
L
EI IZU J o
g 110
IL
.Y 100
5 q o o =ou
OU
Volume of Liquid Added (mL)
3f^ t
Te,.sik1'5bpe=^
ffi;ffi=
#*t-
b. Determinethe massof theemptyflask. (2 pts.)^ t '
I
Tl,< 15^ fe-^ r-^ts ahev^ v1l, of /,Eu,/ 6elo(ey'67aolr ?cra 6r tht y-;nktrcepl-- Ltobin7^ t^ taz 7ra/h, f4's L\Ls9 lt Lefrr<en (6^ p,-c'l €7 3 '^ /t^ n't^ ;n (^) f-v'a fa^5e 6{ -3 - 6 6 - 6' I />^ r<o+oq,ob(L^
In ExperinidntI (Densityof Water).ybufoundthevolumefor eachsampleof waterusinga buret. For eacherrorlistedbelow,statewhethertheerrorwouldmakethe calculateddensity higherthanthe actualdensity,lowerthanthe actualdensity,or makethecalculateddensity the sameasthe actualdensity.Briefly explainin eachcase. a. Error:Thereis an air bubblein theburettip whenyou takethe initial buretreading. The air bubbleremainsin thetip anddoesnot^ changewhile the liquid is dispensed. You thentakea final buretreading. (3 pts.) (1sose 5ee 6R€E^)^ vERSt/r/^ &t\5wev- l-D26. b. Error: Thereis an air bubblein the burettip whenyou^ takethe initial buretreading. While dispensingthe liquid,the air bubblecomesout; thenyou (^) recordthefinal buret reading. (3 pts.) (^) , /bor" J<e €RE€P^ /€RgloN a43dLv-f0^ 2a-
