Density of a Cube 

The lab report must include; Introduction, Hypothesis (if available), Materials and Methods, Results, and Discussion. Add references and format in APA style.

Density of a Plastic cube

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.

Methanol

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

 

Collected Lab Data

Mass of Cube
Mass (g) 0.92
Caliper Method
Cube length (cm) 1.003
Cube volume (cm3) 1.009
Cube density (g/cm3) 0.91
Behavior of Cube in Different Liquids
Methanol sinks
1,2-Dichloroethane floats
Water floats
Displacement Method
Methanol volume (mL) 5.01
Methanol + cube volume (mL) 6.01
Cube volume (mL) 1.00
Cube density (g/mL) 0.92
Suspension method
  Methanol

 volume (mL)

 Water

 volume (mL)

 Cube’s behavior
Mixture 1 2.00 1.00 sinks
Mixture 2 2.00 2.00 sinks
Mixture 3 2.00 3.00 sinks
Mixture 4 2.00 4.00 sinks
Mixture 5 2.00 5.00 sinks
  Methanol volume (mL) Water volume (mL) Cube’s behavior
Mixture 6 2.00 6.00 suspended

 

Identify mixture with cube’s density mixture 6
Cube density (g/mL) 0.947