Answer Happy

Module 2
Post-Lab Assignment
Short Answer
(You must use complete sentences when answering each
question.
1-point deduction per question not answered in complete
sentences.)
1) How many significant figures are in your cm measurement of
Rod A? How did you figure out how many decimal places to use in
your answer?
2) Could you use a 100-mL volumetric flask to measure 50.0 mL of
a liquid? Explain.
3) Which types of measuring devices could you use to measure
50.0 mL of a liquid? Explain.
4) Chefs often estimate the amount of ingredients needed for a
dish. Do you think it would be a good idea to estimate rather than
weigh the amount of chemicals needed for an experiment?
Explain.
5) When the meniscus is above eye level, what is the sign of
your error? (positive or negative)
6) When the meniscus is below eye level, what is the sign of
your error? (positive or negative)
7) What is the effect on the volume when reading the meniscus
above eye level? below eye-level?
8) Examine the data you have collected in this section. Of
the three different types of apparatus used in Part III, which do
you think would give you:
(a) the most precise measurement
of volume?
(b) the least precise
measurement?
9) Based on your results in Part IV of the experiment, what does
the percent error in the masses of your samples tell you about the
accuracy of estimates? Is it a good idea or a bad idea?
Explain.