Chem2 WS/96
Lab #353-Density & Statistics
Prelab

1.	Explain the difference between accuracy and precision.





2.	Explain the difference between random errors and systematic errors.






Refer to lab packet #382-Measurement and Transfer of Chemicals
 for questions 3-5

3.	The volume of a liquid in a graduated container is to be read from
 	the meniscus.  What is a meniscus?







4.	What is the required eye position for the correct reading of a
 	meniscus?





5.	What does the tare function do on a balance?