SCIENCE 8 Lab: Density Tower Mr. Birt

Group # ______Class ______Date ______

Names: ______

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Instructions:

1.  Students get into groups of 3 or 4 (maximum 7 groups).

2.  Each person in group selects a role

a.  Recorder – reads instructions to the group and records the data

b.  Calculator – does all calculations

c.  Measurer – uses the equipment to do all measurements

d.  Cleaner – cleans all equipment between tests and at end of lab

3.  Each group gets

a.  1 graduated cylinder

b.  1 balance scale

c.  1 liquid

4.  Procedure:

a.  Record Group Number and liquid on table on back of this sheet.

b.  Weigh the empty graduated cylinder and record its mass in the table on the back. Be sure to weigh it accurately.

c.  Measure 30 mL of liquid into the graduated cylinder. Be sure to measure it accurately.

d.  Weigh the graduated cylinder and the liquid together and record their combined mass in the table. Again, ensure accuracy.

e.  Calculate the density of the liquid by completing the table. Double check your calculations with the other group members to ensure accuracy.

f.  Show your measurements and calculations to your instructor so he can record your results.

g.  As a class, record the density of each of the other fluids calculated by the other groups. (You do not need to record their other data or calculations.)

h.  Rank the fluids in order of density (1 = highest density).

i.  Fill in the prediction below then proceed to step 7.

5.  Prediction (What do you think will happen if each of the fluids are put into same graduated cylinder in the order of their ranking?):

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6.  Table : Density of the Fluid

Group
# / Liquid / Mass of graduated cylinder
(g)

A

/ Mass of graduated cylinder + liquid
(g)

B

/ Mass of liquid
(g)

C=B-A

/ Volume of liquid
(ml)

D

/ Density of liquid
(g/ml)

C/D

/ Rank
1=
highest
density

7.  Once all groups have finished:

a.  Select the graduated cylinder containing liquid ranked #1 (highest density).

b.  Carefully add the liquid ranked #2 to the graduated cylinder containing fluid #1. Be sure to pour the liquid slowly down the side of the graduated cylinder to minimize mixing of the liquids.

c.  Carefully add each of the other fluids in the order of the ranking, to the same graduated cylinder.

d.  If all measurements and calculations were correct, the cylinder should represent a density tower.

8.  Observations (Record what you observe in the density tower):

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9.  Conclusion (What can you conclude about density and the position of the liquids):

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