Date:
Mode of Execution: ….
Topic: Mechanics
Title: Density
Aim: To determine the density of an irregular object
Apparatus: measuring cylinder, water, digital scale
Procedure:
1. A dry measuring cylinder was retrieved
2. A digital balance was used to find the mass of the empty measuring cylinder3. An irregular object was placed in the measuring cylinder and record the mass of both
objects4. Determined the mass of the irregular object.
5. A string was tied to the irregular object on the irregular object
6. The measuring cylinder was filled to 20 cm3
7. Gently lowered the irregular object in the measuring cylinder with water
8. Recorded the new volume
9. Determined the volume of the irregular object 3cm3
10. Calculated the density of the irregular object using the mass (step 4) and the volume (step
Diagram
Data collected:
Weight of the empty measuring cylinder-104.8g
Weight of the empty measuring cylinder and irregular object-113.4g
Mass of the irregular object- 8.6g
Volume of water after irregular object was added 3cm3
Density if the irregular object- 2.87g/cm3
Calculations
1. 113.4-104.8=8.6g
2. p=m/v= m=8.6 v=3cm = 8/3= 2.87g/cm3
SOE/Precautions
1. Make sure the string it tied firmly onto the irregular object
2. The scale must correctly balance before starting
Conclusion
After finding out the mass of the object and the volume of said object it is easy to then find the
density it has. p=m/v
Mark Scheme
M&M
Density of an Irregular object
Follow instructions (1)
Experiment is executed properly as outlined in the instructions
Accuracy (2)
All mass recorded is accurate
Volumes recorded are accurate
Manipulation of apparatus (7)
Mass of beaker
Mass of irregular object (use of balance)
Tie string securely around the irregular object
Measuring 20mL of water
Gently releasing the irregular object
Reading the new volume at eye level
Cleaning up of work area
Total
(10)