Chemistry 300
Unit 1
Mass Lab
(14/15)
Name
Please complete the following activities at your lab station.
1.
a) Place a weigh boat (white plastic) on an electronic balance. Press the Tare/Re-zero
button so the mass on the balance reads 0.00 grams.
b) Now put exactly 0.25 grams of sodium chloride (salt) in the weigh boat on the balance.
c) Obtain your instructors initials in the space provided. Initials _______________
d) Remove the weigh boat and salt.
Record the exact value on the balance. _____________
e) Why is the value on the balance a negative number now? Explain.
f) Throw away the salt.
2. In this challenge, you are going to be given a bottle that contains a specific amount of water.
Your task is to find the mass of ONLY the water. You may use the materials found at your lab
station. You may not open the bottle and remove any of the water to complete this task.
a) How can you find the mass of the water ONLY?
b) Mass of water only ______________.
c) Explain how you found the mass of only the water:
d) Get instructors initials after you explain. Initials ________________
3. Find an object in the room that has a mass of 1 gram. For this challenge, you may not tear or
break anything to make that object have less mass than it does currently.
a) Object: ______________________
b) Obtain your instructors initials
_______________
4. Obtain a weigh boat and five (5) popcorn kernels. Record the mass of ONLY one popcorn kernel
at a time in the table below. Repeat this process four (4) more times to complete the data table.
Kernel #
Mass (in grams)
1
2
3
4
5
Average Mass
a) According to Orville Redenbacher’s website, an average popcorn kernel is 0.11 g. Please
explain your data as to whether it was accurate, precise, or both.