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# Name: Partner(s): Date: Lab 2: Determining the Density of Unknown Metal MATERIALS & DENSITIES Material Density Material Density Aluminum 2.70 g/cm 3 Maple 0.77 g/cm 3 Brass 8.60 g/cm 3 Polystyrene 1.05 g/cm 3 Copper 8.96 g/cm 3 Polyamide (Nylon) 1.15 g/cm 3 Acrylic 1.17 g/cm 3 High Density Polyethylene 0.95 g/cm 3 Phenolic 1.32 g/cm 3 Acetal 1.42 g/cm 3 Polypropylene 0.90 g/cm 3 Chlorinated Polyvinyl chloride (PVC) 1.54 g/cm 3 Polyethylene terephthalate (PETG) 1.28 g/cm 3 PTFE (Teflon) 2.20 g/cm 3 DATA Description of Unknown Mass (g) Displacement Volume (mL) Linear Measurement Volume Initia l Final Volume (mL) Diameter (mm) Length (mm) Volume (cm 3 ) convert mm 3 Density calculation (Displacement) Density calculation (Linear Measurement) Determined Identity of Unknown :

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Page 1: regischemistry20172018blog.files.wordpress.com…  · Web viewName: Partner(s): Date: Lab 2: Determining the Density of Unknown Metal. MATERIALS & DENSITIES

#Name:Partner(s):Date:Lab 2: Determining the Density of Unknown Metal

MATERIALS & DENSITIESMaterial Density Material DensityAluminum 2.70 g/cm3 Maple 0.77 g/cm3

Brass 8.60 g/cm3 Polystyrene 1.05 g/cm3

Copper 8.96 g/cm3 Polyamide (Nylon) 1.15 g/cm3

Acrylic 1.17 g/cm3 High Density Polyethylene 0.95 g/cm3

Phenolic 1.32 g/cm3 Acetal 1.42 g/cm3

Polypropylene 0.90 g/cm3 Chlorinated Polyvinyl chloride (PVC)

1.54 g/cm3

Polyethylene terephthalate (PETG)

1.28 g/cm3 PTFE (Teflon) 2.20 g/cm3

DATA

Description of Unknown

Mass (g)

Displacement Volume (mL) Linear Measurement Volume

Initial Final Volume (mL)

Diameter (mm)

Length (mm)

Volume (cm3)convert mm3

Density calculation (Displacement) Density calculation (Linear Measurement)

Determined Identity of Unknown :

Percent Error Determination based upon determined identity

Water Displacement Linear MeasurementCalculation % error Calculation % error

Page 2: regischemistry20172018blog.files.wordpress.com…  · Web viewName: Partner(s): Date: Lab 2: Determining the Density of Unknown Metal. MATERIALS & DENSITIES

POST-LAB QUESTIONS

1. Which type of volume determination was more precise: water displacement or linear measurement? Explain your reasoning. How could the less precise method be made more precise?

2. Did the density that you calculated for each unknown match the densities given in the table exactly? If not, explain why your calculated density was different than the density given in the table.

3. Look up the definitions of intensive and extensive properties, respectively. Is density an intensive or an extensive property? Explain your reasoning.