Download Laboratory Pb Name: Date: ______ (1) Measure the mass of a

Laboratory
Name:
Pb
____________________________________
Date: ____________
(1) Measure the mass of a sample of lead. Record the mass with units.
(2) Fill a graduated cylinder to the 50.0 mL line with water. Slowly slide the lead weight into the
water, and measure the new volume of water. Record the volume appropriately here.
(3) Using the initial volume and the final volume of the water, calculate the volume of the lead.
Show work, and record to the correct number of decimal places.
(4) Using the mass of lead and volume of lead above, calculate the density of lead. Show all
work, and record your answer to the correct number of significant figures.
(5) Table S in the Chemistry Reference Tables lists the accepted value for the density of lead.
Calculate your percent error. Show all work.
Pb
Laboratory
(6) Calculate the amount of heat energy in Joules required to increase the temperature of your
sample of lead by 75.0 ˚C. The specific heat of lead is 0.129J/g˚C. Show all work, and
record your answer to the correct number of significant figures.
(7) You have a pure sample of neutral lead-206 atoms. Determine
a.
the atomic number of this element
b.
the mass number of this isotope
c.
the overall charge on this atom
d.
the charge on the nucleus of the lead atom
e.
the number of protons in the lead-206 nucleus
f.
the number of neutrons in the lead-206 nucleus
g.
the number of electrons in the lead-206 atom
(8) Naturally occurring lead exists as four stable isotopes:
isotope
204
Pb
206
Pb
207
Pb
208
Pb
mass number
203.973 amu
205.974 amu
206.9759 amu
207.9766 amu
percent abundance
1.480%
23.60%
22.60%
52.30%
Calculate the average atomic mass of lead. Show a correct numerical setup.