chemistry october 9, 2014 lab 03 - density. lab starter read the pre-lab and answer the following:...
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CHEMISTRYOCTOBER 9, 2014
LAB 03 - Density
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LAB Starter
• Read the Pre-Lab and answer the following:– Make a prediction about the density of oil and
water based off the Pre-Lab reading– Write the density formula
• You have 2 minutes to read and answer the 2 questions.
• You are silent and seated.
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OBJECTIVE
• SWBAT – Apply the formula of density– Explain how density can help them predict how a
liquid will behave. – Apply density to explain a real-life event
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AGENDA
–Pre-Lab–Lab
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IMPORTANT DATES
• Test 01 – Friday
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Lab 03
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Density of Liquid
• Do you think oil and water have the same density?
• Which one would float?• Why?
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Water Data (#A-C)
Description Data Values
A. Mass of graduated cylinder (g)
28.0 g
B. Volume of water (ml) 9.0 ml
C. Mass of water and graduated cylinder (g)
36.8 g
D. Mass of water only (C-A) in gram
E. Density of water (g/ml)
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Oil Data
Description Data Values
F. Volume of oil (ml) 8.0 mlG. Mass of oil and graduated cylinder (g)
35.3 g
H. Mass of oil only (G-A) in gramI. Density of oil (g/ml)
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Syrup DataDescription Data Values
J. Volume of syrup (ml) 8.0 ml
K. Mass of oil and graduated cylinder (g)
38.9 g
L. Mass of syrup only (K-A) in gram
M. Density of syrup (g/ml)
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Isopropyl Alcohol DataDescription Data Values
N. Volume of alcohol (ml)
10.0 ml
O. Mass of alcohol and graduated cylinder (g)
36. 7 g
P. Mass of alcohol only (O-A) in gram
Q. Density of syrup (g/ml)
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The Liquid Layer
Prediction
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The Liquid Layers - Prediction
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The Liquid Layer
Experiment
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The Liquid Layers – Actual
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CONCLUSION
• Did conclusion supports prediction? Why or why not?
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MENISCUS
• Read the graduated cylinder by reading the meniscus (the lowest portion of the convex dip of the liquid)– Meniscus form because of adhesion force is
stronger than cohesion force
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Application
• Assume that a test tube was filled with mercury (a liquid metal with density 13.6 g/mL), water (density measured above), and maple syrup (1.4 g/mL). Draw a diagram to show how the liquid will be layered. Make sure to label the diagram. Support your drawing with evidence. Write 1-3 sentences. Make sure to include a discussion with density.
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DRAWINGS
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Bringing it in
• Let revisit the Exxon Valdez Oil Spill. – Do you think your prediction is still valid after
what you have learned and observed in class? Why or why not? Provide support using the word density.
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Exxon Valdez - continue
• Explain how the density of the liquid (oil and water) could have negative impact on the wildlife, especially the birds. Explain in 2-4 sentences using support from the experiment.
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CLEAN UP
• CLEAN UP AROUND YOU• Material managers – bring the equipment
back to the Lab Bench