3_Measurement_Report
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Chemistry
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Feb 20, 2024
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Name: Lab Partner: Experiment Date: Lab Report: Introducing Measurements in the Laboratory
Part A: Measuring the Dimensions of Regular Geometric Shapes
Experimental Data
Shape
Dimensio
ns
Measurement
# Significant Figures
Rectangle
Length
Width
Circle
Diameter
Data Analysis
1)
Perform the conversions indicated below. Show your work, and report your answers in scientific notation.
a.
Convert the measured rectangle length to pm.
b.
Convert the measured circle diameter to km.
2)
Calculate the areas of your rectangle and circle in cm
2
. Show your work, and report your answers to the correct number of significant figures.
a.
Area of rectangle
b.
Area of circle
3)
Convert the area of your circle to μ
m
2
. Show your work, and report your answer in scientific notation.
1
Part B: Measuring the Volume of a Sample of Water
Experimental Data
Measuring Device
Volume Measurement
# Significant Figures
100-mL Beaker
100-mL Graduated Cylinder
Data Analysis
1)
Compare your volume measurements in the table above. Which instrument, the beaker or the graduated
cylinder, provides the more precise measurement? Explain.
2)
Convert the volume of water obtained using the graduated cylinder to hm
3
. Show your work, and report your answer in scientific notation.
Part C: Measuring the Mass of Solids
Experimental Data
Table 1 – Mass of an Erlenmeyer Flask
Measuring Device
Mass Measurement
# Significant Figures
Triple-Beam Balance
Electronic Balance
Table 2 – Weighing by Difference
Mass Measurement
# Significant Figures
Mass of Empty Beaker
Mass of Beaker + Sugar
2
Data Analysis
1)
Compare your mass measurements obtained for the Erlenmeyer flask in Table 1. Which balance, triple-beam
or electronic, provides the more precise measurement? Explain.
2)
Consider the data you obtained in Table 2.
a.
Calculate the mass of sugar weighed out. Show your work.
b.
Circle one: When performing the above calculation, significant figures / decimal places
are the primary consideration.
3)
Perform the conversions indicated below. Show your work, and report your answers in scientific notation.
a.
Convert the mass of the sugar weighed out to fg.
b.
Convert the mass of the sugar weighed out to Gg.
Part D: Measuring the Melting Point of an Unknown Solid
Experimental Data
Unknown Compound ID Code: Measured by
Melting Point
# Significant Figures
Group 1: You and your
partner
Group 2
Group 3
Group 4
3
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Average Value
4
1)
Using the average value above, identify your unknown compound (see Procedure, Part D, #7).
Name of Compound: True Melting Point: 2)
Which of the measured melting points recorded in the table was the most accurate? Explain.
3)
Calculate the percent error between the experimental melting point that you and your partner measured and the substance’s true melting point. Report your answer to the correct number of significant figures.
4)
Perform the temperature conversions indicated below. Show your work, and report your answers to the correct number of significant figures.
a.
Convert the true
melting point of your compound to K.
b.
Convert the true
melting point of your compound to °
F.
5
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