CHEMISTRYOCTOBER 9, 2014

LAB 03 - Density

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.

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

AGENDA

–Pre-Lab–Lab

IMPORTANT DATES

• Test 01 – Friday

Lab 03

Density of Liquid

• Do you think oil and water have the same density?

• Which one would float?• Why?

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)

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)

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)

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)

The Liquid Layer

Prediction

The Liquid Layers - Prediction

The Liquid Layer

Experiment

The Liquid Layers – Actual

CONCLUSION

• Did conclusion supports prediction? Why or why not?

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

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.

DRAWINGS

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.

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.

CLEAN UP

• CLEAN UP AROUND YOU• Material managers – bring the equipment

back to the Lab Bench