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Title: Golf Ball Lab
Description: Honors Chemistry
September 17, 2020

Golf Ball Inquiry Lab
HONORS CHEMISTRY
September 11, 2020

Density Inquiry Lab - DENSITY CONTEST

Determine the minimum amount of salt to make a golf ball float in 100 mL of water .
     OR
Determine the maximum amount of sand that can be put in a film canister so that it can still 'float' in water.

Procedure

You will conduct an experiment to gather further evidence on calculating the heaviest mass of sand plus the film canister that will still float in water.  You will be provided with the following materials for your experiment—a film canister (no lid), ruler, string, beaker, balance, graduated cylinder, sand.  Before you devise your procedure, answer the following questions in the designated place on your report.

·         What is the control in your experiment?

·         What are the independent and dependent variables?

·         Which variables will you hold constant in all of your trials?

Write out your procedure in the appropriate section in your report.  Your procedure should be in enough detail that someone could repeat your experiment.  Your procedure must be an ordered list of steps written in complete sentences.  Before finalizing your procedure, make sure you have chosen a reasonable density to use to get the film canister filled with sand to float in water.

 Evidence

Carry out your procedure.  Make an organized data table, including headings and units, in your report.

Analysis

Calculations: Show the following calculations in the report.

1.  Calculate the volume of container (see background information for volume equation)

2.  Maximum Mass of Sand

3.  % Difference Calculation between the Mass used for your sample vs. the mass used for the Winning Sample

Conclusion

Discuss the density you used compared to the density of water and why you chose that density.   Read the following article about how density is used in screenings for giving blood and answer the questions that follow.

Screening Tests for Iron Levels

http://www.anemia.org/professionals/feature-articles/content.php?contentid=378

CuSO4 (copper sulfate)
This is a qualitative screening test based on specific gravity. The density of the drop of blood is directly proportional to the amount of hemoglobin it contains. The sample of donor's blood dropped into copper sulfate solution becomes encased in a sac of copper proteinate, which prevents any change in the specific gravity for about 15 seconds. If the hemoglobin is equal to or more than 12.5 gm/dL the drop will sink within 15 seconds and the donor is accepted. If the blood drop sinks to the middle and remains or starts to rise, a microhematocrit or comparable test is usually used to confirm the deferral. This is not a quantitative test and will only show that the hemoglobin is equal to, below, or above acceptable limits. Test results that indicate satisfactory hemoglobin levels are usually accurate, but some results that indicate low hemoglobin levels can be false. Repeating the test by a second method is sometimes used as confirmation.7

1.      What does it mean for giving blood if the drop of blood does not sink at 

             all and floats or remains in the middle of the tube?

 

 

2.   If the “density of the drop of blood is directly proportional to the amount of hemoglobin it contains”, draw a sketch of the graph with the amount of hemoglobin as the independent variable and the density of the blood drop as the dependent variable.

 

 http://maaw.info/images/BlankGraph.gifhttp://img.ehowcdn.com/og-image-tag/ehow/images/a04/jr/ls/donor-hemoglobin-using-copper-sulfate-800x800.jpg

 

blood drop



HW: Review lab results students design a lab to experimentally determine the minimum amount of salt needed to be added to 100 mL of water to make a golf ball float.

Day 1: Discuss what equipment is needed and available
Have students get in groups and begin to investigate this problem.
Day 2: Final day to solve problem.
http://en.wikipedia.org/wiki/Dead_Sea_salt
Homework:
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