Question

In this experiment you will measure the density of a liquid and a solid object. Be sure to record all of your measurements with the correct degree of precision and perform your calculations properly, according to the rules of arithmetic for measured values. A. Measurement of the density of water. 1. Weigh a small beaker (degree of precision?). Place about 25 mL of water in a 50 mL graduated cylinder and record its volume (degree of precision?). Pour the water into the beaker and weigh the beaker and water together. From these data, calculate the density of the water, giving your answer with the proper number of significant figures. Volume of water in cylinder 26.7 mL Mass of empty beaker 78.013 g Mass of beaker with water 104.735 g Mass of water in beaker g Density of water g/mL Show calculations: 2. After pouring out the water from your beaker, add a second 25 mL of water to the graduated cylinder. As before, record the volume of water in your graduated cylinder. Pour the water into the beaker and weigh the beaker after adding the water. From these data, calculate the density of the water a second time. You need not dry the beaker before performing this second experiment. Why? Volume of water in cylinder 24.2 mL Mass of empty beaker 78.013 g Mass of beaker with water 102.181 g Mass of water in beaker g Density of water _g/mL Show calculations: What do you notice about the two values of density obtained in these two experiments? How close are your two values? If there is variation, in what decimal place to you see the variation? Why should you expect variation in the last decimal place of your recorded values? 3. Calculate the average density you determined for this unknown liquid and record below. [ _g/mL + g/mL] / 2 = _g/mL

          In this experiment you will measure the density of a liquid and
a solid object. Be sure to
record all of your measurements with the correct degree of
precision and perform your
calculations properly, according to the rules of arithmetic for
measured values.
A. Measurement of the density of water.
1. Weigh a small beaker (degree of precision?). Place about 25
mL of water in a 50 mL
graduated cylinder and record its volume (degree of precision?).
Pour the water into the beaker
and weigh the beaker and water together. From these data,
calculate the density of the water,
giving your answer with the proper number of significant
figures.
Volume of water in cylinder 26.7 mL 
Mass of empty beaker 78.013 g
Mass of beaker with water 104.735 g
Mass of water in beaker ____ g
Density of water ______g/mL
Show calculations:
2. After pouring out the water from your beaker, add a second 25
mL of water to the
graduated cylinder. As before, record the volume of water in
your graduated cylinder. Pour the
water into the beaker and weigh the beaker after adding the
water. From these data, calculate the
density of the water a second time. You need not dry the beaker
before performing this second
experiment. Why?
Volume of water in cylinder 24.2 mL
Mass of empty beaker 78.013 g
Mass of beaker with water 102.181 g
Mass of water in beaker ____g
Density of water _____g/mL
Show calculations:
What do you notice about the two values of density obtained in
these two experiments? How
close are your two values? If there is variation, in what
decimal place to you see the variation?
Why should you expect variation in the last decimal place of
your recorded values?
3. Calculate the average density you determined for this unknown
liquid and record below.
[ ___g/mL + ____g/mL] / 2 = _____g/mL

Added by John M.

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