Sig Digs Lab Practice(Show units and correct sig digs.) 

Al strip:Measure the mass, length, and width. 

Calculate: MassArea

 

Given that the density of Al is 2.70 g/cm3, determine the thickness (h) of the Al strip. 

 Rubber stopper:Measure the mass and determine the volume by water displacement. Calculate the density.

Al strip:MassLengthWidth 

Calculate:MassArea

  

h = ?

Rubber stopper:Mass  

Vf

Vi

VRS

  Calculate:

Density =

D = 2.70 g/cm3

Al strip:Mass 1.31 g (1.28 g – 1.33 g)Length 10.20 cm (10.10 cm – 10.30 cm)Width 1.00 cm (0.90 cm – 1.10 cm) 

Calculate: Mass 1.31 g = 0.128 g/cm2

Area 10.2 cm2 

D = M V = M = 1.31 g = 0.485 cm3 V D 2.70 g/cm3

 

V = l x w x h h = V = 0.485 cm3

l x w 10.20 cm x 1.00 cm 

h = 0.0475 cm

Rubber stopper:Mass 9.67 g (9.33 g – 10.00 g) 

Vf mLVi mLVRS 5.6 mL (4.6 mL – 6.7 mL) Density = M = 9.67 g = 1.7 g/ mL

V 5.6 mL (1.4 – 2.1)