Density of a Plastic cube
The lab report must include; Introduction, Hypothesis (if available), Materials and Methods, Results, and Discussion. Add references and format in APA style.
Materials:
Equments – Balance, Graduated cylinder, Glass Rods, Polypropylene cubes, Caliper
Chemicals – Water, 1,2 – Dichloroethane, Methanol
Procedure:
Tare the balance. Place cube on the balance.
Determine mass of cube and document mass.
Use the caliper to pick up the cube and measure the edge of cube length. Record the data.
Use cube’s length to calculate volume (Find cm3 by multiplying the length 3 times.
Use cube’s mass and volume to calculate density (Find density by dividing the mass by cm3). Record data.
Use clean pipet to transfer 3-5 mL of liquid to clean graduated cylinder.
Place cube in graduated cylinder containing liquid. Record if the cube sank, floated, or if it was suspended.
Pour liquid into Chemicals for Disposal beaker. Place used graduated cylinder in Wash/Waste bin.
Questions
If the balance was not tared to display 0.00 g prior to adding the cube, which of the following statements are true? Select all that apply.
The mass of the cube can be calculated.
The mass displayed on the balance before the cube was added will need to be subtracted from the mass displayed on the balance with the cube.
The cube can be reweighed after the balance has been tared to display 0.00 g.
The polypropylene cubes have a density of 0.946 grams per milliliter. Identify the true statement(s). Select all that apply.
The cube sinks in methanol because methanol’s density is less than the cube’s density.
The cube floats on water because the water’s density is greater than the cube’s density.
Which liquid(s) could be used for displacement? Select all that apply.
Review your observations of the behavior of the cube in each liquid. Which liquids can you use to make your suspension mixture? Select all that apply.
Methanol and 1,2-dichloroethane
Methanol and water
