General Chemistry Practical Examination Study Sheet You will report to lab at th
ID: 698150 • Letter: G
Question
General Chemistry Practical Examination Study Sheet You will report to lab at the following time for your practical. Please bring a calculator and a pencil You are welcome to ask any questions you may have on these skills from now until noon the day of the practical exam Show up on time. Write only on the poper you are given No talking during the practical 10% penalty and wait for next round of the practical. 10% penalty for each instance. Forfeit the rest of the practical. Know the names of the following equipment Take a measurement ACCURATELY including UNITS and the correct amount of SIG FIGS. SIG FIGS KNOWN DIGITS ONE of some UNCERTAINTY L. . 1 ESTIMATED example KNOWN DIGITS Each "line" represents DIGIT a) a ruler marked in cm b) a 10 ml graduated cylinder (red base) (yellow base) c) a 50 mL graduated cylinder_-_ d) a 100 mL beaker e) a 50 mL buret sketch 47Explanation / Answer
As given in the formula for the number of significant figures (SIG FIGS),
SIG FIGS = KNOWN DIGITS + ONE (of some uncertainty)
a) For a ruler marked in cm,
(Assuming the ruler has lines per mm markings)
KNOWN DIGITS (each line represents) : 0.1 cm
1st estimated digit: 0.01 cm
Example of measurement: 2.11 cm
b) a 10 mL graduated cylinder
(Assuming that the yellow base cylinder has markings per 0.2 mL)
KNOWN DIGITS (each line represents) : 0.2 mL
1st estimated digit: 0.1 mL
Example of measurement: 2.3 mL
-a 10 mL graduated cylinder
(Assuming that the red base cylinder has markings per 0.1 mL)
KNOWN DIGITS (each line represents) : 0.1 mL
1st estimated digit: 0.01 mL
Example of measurement: 2.31 mL
c) a 50 mL graduated cylinder
(Assuming that the cylinder has markings per 1 mL)
KNOWN DIGITS (each line represents) : 1 mL
1st estimated digit: 0.1 mL
Example of measurement: 21.1 mL
d) a 100 mL beaker
(Assuming that the cylinder has markings per 10 mL)
KNOWN DIGITS (each line represents) : 10 mL
1st estimated digit: 1 mL
Example of measurement: 11 mL
e) a 50 mL buret
(Assuming that the buret has markings per 0.1 mL)
KNOWN DIGITS (each line represents) : 0.1 mL
1st estimated digit: 0.01 mL
Example of measurement: 21.15mL
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