The purpose of this laboratory experiment was to learn how to properly calculate density. Also another purpose was to learn how to correctly use water displacement to calculate the density of pennies.
* 15 pennies minted before 1982
* 15 pennies minted in or after 1982
* 50 mL graduated cylinder
* Triple Beam Balance
1. Check to see if your balance pointer is on zero while all the movable masses are on zero. This will get you more accurate results.
2. Place your weigh paper on the pan.
3. Then move the movable masses until your pointer evens out at zero again.
4. Record the mass of the weigh paper.
5. Recalibrate your balance.
6. While keeping the weigh paper on the pan, determine the mass of 15 pennies minted before 1982. Repeat your measurement two more times, for a total of 3 trials.
7. Repeat all of step 6 with the 15 pennies minted in 1982 or after.
8. Pour 25 mL of water into the 50 mL graduated cylinder. Add the 15 pennies minted before 1982 into the graduated cylinder. Find and record the volume of the pennies
9. Repeat step 8 with the pennies minted in 1982 or after.
10. Review your data for any large differences between the trials. If there are any large differences, repeat the appropriate measurement.
Mass of Pennies
Object Trial 1 (grams) Trial 2 (grams) Trial 3 (grams)
Weigh Paper 0.90 0.90 0.90
Pennies made before 1982 47.20 47.20 47.20
Pennies made in 1982 or later 38.50 38.55 38.53