Name:
Teacher:
Year & Section:
Date:
Activity 1
Measurements and Evaluation of Data
Objectives:
1.
2.
3.
4.
5.
At the end of the activity the student must
Be able to properly use the platform balance
Develop the correct technique in reading volumes of clear liquids
Be able to apply the rules in significant figures to mathematical operations
Be aware of precision limitations of each measuring instrument
Collect data that is reproducible and within an acceptable margin of
error
Materials:
three 5-peso coins or three 10-peso coins
Experimental Procedure
1.
2.
3.
4.
5.
6.
With the use of marking pen, label each one of the three 5-peso coins
with the numbers 1 to 3.
Be sure to set the weighing scale to zero point before every measurement.
Put the 3 coins into dry watch glass and record the total mass.
Remove coin 1 and measure the total mass of the watch glass and the 2
remaining coins. Record the data.
Record the coin 2 and record the total mass of the watch glass and coin
3
Remove the last coin and weigh the empty watch glass. Record the data.
Part B. Measurement of Volumes of Liquids
Materials
beaker, graduated cylinder
Experimental Procedure
Proper Technique in Reading the Volume of Clear Liquids
1.
2.
3.
4.
Fill a 100-mL graduated cylinder with tap water between 60 to 70 mL.
Raise the graduated cylinder until the lower meniscus (curved lower
portion of the liquid level) is in the same level as your line of sight. Record
the volume to the nearest 0.1 mL. This is the proper way to read the
volume of clear liquids, at eye level.
Raise the graduated cylinder until the lower meniscus is higher than your
line of sight. Record the volume to the nearest 0.1 mL.
Raise the graduated cylinder until the lower meniscus lower than your line
of sight. Record the volume to the nearest 0.1 mL.
Precision:
1.
2.
3.
The Beaker, 100-mL and 10-mL Graduated Cylinder
Obtain a 100-mL beaker and fill it with about 20 mL of water. Record the
volume reading.
Carefully transfer the water into a 100-mL graduated cylinder. Record the
volume reading.
Pour the contents of the 100-mL graduated cylinder into a 10-mL
graduated cylinder. Record each volume reading until all of the water
has been measured.
Data and Calculations: The Measurements and Evaluation of Data
Part A. Measurement of Mass Using Various Weighing Equipment
I.
The Use of the Weighing Scale
Details
Mass (g) of watch
glass plus 3 coins
Mass (g) of watch
glass plus 2 coins
Mass (g) of coin
removed
Average mass
II.
Trial 1
Details
Mass (g) of watch
glass plus 2 coins
Mass (g) of watch
glass plus 1 coins
Mass (g) of coin
removed
Trial 2
Details
Mass (g) of watch
glass plus 1 coins
Mass (g) of watch
glass
Mass (g) of coin
removed
Trial 3
Details
Mass (g) of watch
glass plus 2 coins
Mass (g) of watch
glass plus 1 coins
Mass (g) of coin
removed
Trial 2
Details
Mass (g) of watch
glass plus 1 coins
Mass (g) of watch
glass
Mass (g) of coin
removed
Trial 3
The Use of the Platform Balance
Details
Mass (g) of watch
glass plus 3 coins
Mass (g) of watch
glass plus 2 coins
Mass (g) of coin
removed
Average mass
Trial 1
Part B. Measurement of Volumes of Liquids
Proper Techniques of Measuring Clear Liquids (Effect of the Position of the Lower
Meniscus on the Reported Volume of Liquids)
Position of Lower Meniscus
Volume (mL) of H2O
At Eye Level
Higher than Eye Level
Lower Than Eye Level
Precision: The Beaker, 100-mL and 10-mL Graduated Cylinder
Glassware used
100-mL Beaker
_____________
100-mL Graduated cylinder
_____________
10-mL Graduated cylinder
Volume (mL) of H2
Measurement 1
Measurement 2
Total Volume (mL)
_____________
_____________
_____________
Among the three glassware used, which one has the highest precision? Support
your answer.
________________________________________________________________________________
________________________________________________________________________________
____
When will it be more advantageous to use a 100-mL graduated cylinder over a 10mL graduated cylinder?
________________________________________________________________________________
________________________________________________________________________________
___
When will it be more advantageous to use 10-mL graduated cylinder over 100-mL
graduated cylinder?
________________________________________________________________________________
________________________________________________________________________________
___
REMEMBER: the last digit that must be reported (or written) represents the 1/10 th of
the smallest known division.
For a 100 mL graduated cylinder, there are 10 lines that divide each 10 mL
volume. Each line represents the smallest known division and this is equivalent to 1
mL.
The volume of a liquid measured with the use of 100-mL graduated
cylinder must be reported until 0.1 mL or until ________ digit(s) after the decimal
point.
For a 10 mL graduated cylinder, there are 10 lines that divide each 1 mL volume.
Each line represents the smallest known division and this is equivalent to 0.1 mL.
The volume of a liquid measured with the use of 10-mL graduated cylinder
must be reported until 0.01 mL or until ________ digit(s) after the decimal point.