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.
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