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C1 -Density Tower Activity
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Density Tower Lab

Aim: You will predict the sequence of four different liquids based upon their calculated densities.

Pre-lab Questions

Define the following terms and state possible units they can be measured in:

Mass: ___________________________________________________________________

        Units used to measure mass:

Volume: _________________________________________________________________

        Units used to measure volume:

Density: _________________________________________________________________

        

        Units used to measure density:

State the equation used to determine density:

Materials:

Method:

  1. Find the mass of the 30 ml container (while empty).
  2. Record mass in Table 1 (in grams).
  3. Carefully pour 10ml of your first liquid into the container and find mass.
  4. Calculate the mass of just the liquid (total mass – mass of beaker = mass of liquid)
  5. Record the volume of the liquid in Table 1 (in mL).
  6. Using the mass of the liquid and volume, calculate the density of the liquid.
  7. Repeat procedure for liquids 2-4.

Data Table:

Mass of Empty Container (g)

Total Mass (liquid & container) (g)

Mass of Liquid

(g)

Volume  of Liquid (ml)

Density of Liquid (g/ml)

Liquid 1

Liquid 2

Liquid3

Liquid

4

What you predict your density column (test tube) will look like:

What your density column actually looked like:

POST LAB QUESTIONS

1. What decision did you have to make regarding equipment when you calculated the densities

       of your liquids?

       

       Why did you choose that  instrument?

2. Explain why the liquids did not all mix together?

3. Which liquids were denser than the water? What were their densities?

4. Which liquids less dense than water? (Water = 1.0g/ml) What were their densities?  

5. What does density have to do with floating and sinking?

6. What might be a source of experimental error in this investigation?

Score

Skill C1: Using and organizing techniques, apparatus, and materials

0

No evidence of positive achievement for this skill

1

Some evidence of positive achievement, but the criteria for a score of 2 are not met

2

Follows written, diagrammatic, or oral instructions to perform a single practical operation. Uses familiar apparatus and materials adequately, needing reminders on points of safety.

3

Is beyond the level defined for 2, but does not meet fully the criteria for 4.

4

Follows written, diagrammatic, or oral instructions to perform an experiment involving a series of step-by-step practical operations. Uses familiar apparatus, materials, and techniques adequately and safely.

5

Is beyond the level defined for 4, but does not meet fully the criteria for 6.

6

Follows written, diagrammatic, or oral instructions to perform an experiment

involving a series of practical operations where there may be a need to modify or adjust one step in the light of the effect of a previous step.

Uses familiar apparatus, materials, and techniques safely, correctly, and methodically.