Chemistry/Measuring Volume

Science 8 Laboratory Investigation
MEASURING VOLUME

Purpose

To learn how to measure the volume of various objects by direct and indirect measurements, using a graduated cylinder.

Data Table

Step Object Measured volume (mL)
2 Number of 10 mL graduated cylinder = ________
Volume of water in 10 mL graduated cylinder ---->
3 Number of 25 mL graduated cylinder = ________
Volume of water in 25 mL graduated cylinder ---->
4 Number of 100 mL graduated cylinder = ________
Volume of water in 100 mL graduated cylinder --->
5 I have put 4.6 mL of water in a 10 mL graduated cylinder. Initialled by: _____________
6 I have put 6.2 mL of water in a 25 mL graduated cylinder. Initialled by: _____________
7 (a) Aluminum block measurements:
length = ___________ cm
width = ___________ cm
height = ___________ cm
7 (b) Volume of water initially in 100 mL cylinder ------->
7 (d) Volume reading after putting in the aluminum ---->

Questions
1. The volume of the aluminum block can be calculated from the following mathematical formula.

VOLUME = LENGTH x WIDTH x HEIGHT
Use your values for step 7 (a) in your Data Table to calculate volume of the aluminum block. Show your work.

2. You can also calculate the volume of the aluminum block by the following VOLUME DISPLACEMENT method. Subtract the initial volume of water (7–b in your Data Table) from the volume of water shown after the aluminum block is placed in the graduated cylinder (7-d in your Data Table). The result is the volume of the aluminum.

3. The volume you calculated in question 1 should be equal to the volume you found in question 2. Do your two volumes seem to be close to each other? Explain your answer.

4. If you are given a small, irregularly-shaped, jagged piece of rock, which method will probably give you a more accurate value for the volume: the method used in question 1 or the method used in question 2? Explain your answer.

5. Which of the measurements you made in this laboratory investigation are DIRECT MEASUREMENTS and which are INDIRECT MEASUREMENTS?