CHE 121 GMC Alcohol Density Problem Lab Report: Chemistry Answers 2022

CHE 121 GMC Alcohol Density Problem Lab Report: Chemistry Answers 2022

CHE 121 GMC Alcohol Density Problem Lab Report: Chemistry Answers 2022

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CHE 121 GMC Alcohol Density Problem Lab Report

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Alcohol Density Problem
QEP Critical Thinking Assignment
CHE-121: Principles of Chemistry 1
In the United States, Customs and Border Patrol agents often need to know the alcohol content of
declared beverages being brought back into the country from abroad. Sometimes, beverages are
labeled improperly. The United States Federal Alcohol Administration Act states that wines must
contain an alcohol content within the range of 7-24%; below this value and above 0.5% is
considered a beer and above 24% is considered to be a spirit. Of course, time is of the essence
because of the shear volume of people passing through Customs. Thus, an easy way to do this
rapidly is to calculate the density of the alcohol and compare it to known values.
In this laboratory experiment, you will be required to generate a set of known densities for
alcohols with a certain percentage. Your ultimate task will be to determine classify two unknown
alcohols based on their percent alcohol composition based on the following table:
Percent Alcohol Concentration Classification
24%
Spirit
There are several learning objectives of this lab:
1. Practice computing the densities of unknown solutions volumetrically and
gravimetrically.
2. Practice recording data and taking notes from experimental procedures.
3. Analyze data to make valid scientific conclusions.
The procedure below is but one way to perform the following lab experiment. As you work
through the experiments, consider other ways that you may possibly carry out each step or even
propose a new lab procedure in your report. Record any necessary notes and data in the pages
that follow the procedure below. Write your report using the guidelines in the “Laboratory
Information” section of the course’s home page.
Alcohol Density Problem
QEP Critical Thinking Assignment
CHE-121: Principles of Chemistry 1
Supplies:
Reagents:
1. Distilled water
2. 70% alcohol solution
3. Unknown alcohol solution A
4. Unknown alcohol solution B
Instruments
1. 250 mL beaker
2. 25 mL graduated cylinder
3. 100 mL volumetric flask
4. Balance
Alcohol Density Problem
QEP Critical Thinking Assignment
CHE-121: Principles of Chemistry 1
Procedure:
Pre-Lab Calculations (Record in ‘Notes’ section)
1. Compute the required volume of a 70% (v/v) stock solution of alcohol needed to produce
100 mL of a 0.5% (v/v) stock solution.
2. Compute the required volume of a 70% (v/v) stock solution of alcohol needed to produce
100 mL of a 7% (v/v) stock solution.
3. Compute the required volume of a 70% (v/v) stock solution of alcohol needed to produce
100 mL of a 24% (v/v) stock solution.
Preparing the Lab
4. From the course home page, click on the Virtual Lab Tutorial link to watch the overview
of using the virtual lab.
5. From the course home page, access the lab environment by clicking on the Virtual Lab
link.
6. After the lab environment loads, click ‘File’ then ‘Load an Assignment.’
7. Select the ‘Molarity and Density’ category.
8. Select the ‘Alcohol Density Problem’ assignment.
9. At this point, you have prepared the laboratory with the require supplies to complete your
experiments.
Determine the Densities of Standards and Unknowns
1. Select the ‘Solutions’ tab if it is not already selected. You should now see four items
including the distilled water and the three unknown metals. If not, verify that you have
selected the correct assignment by following the steps in the “Preparing the Lab” section
again.
2. Determine the density of a 0.5% alcohol solution:
a. Fill a 250 mL beaker with distilled water.
b. Transfer a 100 mL volumetric flask to the scale and then tare the scale.
Alcohol Density Problem
QEP Critical Thinking Assignment
CHE-121: Principles of Chemistry 1
c. Add the previously computed amount of the 70% stock alcohol solution to the
graduated cylinder using the ‘Precise’ option for pouring. Transfer this amount to
the volumetric flask.
d. Dilute the aliquot by using the ‘Precise’ option for pouring. Record the final mass
of the solution.
e. Compute and record the density of the solution.
3. Determine the density of a 7% alcohol solution:
a. Fill a 250 mL beaker with distilled water.
b. Transfer a 100 mL volumetric flask to the scale and then tare the scale.
c. Add the previously computed amount of the 70% stock alcohol solution to the
graduated cylinder using the ‘Precise’ option for pouring. Transfer this amount to
the volumetric flask.
d. Dilute the aliquot by using the ‘Precise’ option for pouring. Record the final mass
of the solution.
e. Compute and record the density of the solution.
4. Determine the density of a 24% alcohol solution:
a. Fill a 250 mL beaker with distilled water.
b. Transfer a 100 mL volumetric flask to the scale and then tare the scale.
c. Add the previously computed amount of the 70% stock alcohol solution to the
graduated cylinder using the ‘Precise’ option for pouring. Transfer this amount to
the volumetric flask.
d. Dilute the aliquot by using the ‘Precise’ option for pouring. Record the final mass
of the solution.
e. Compute and record the density of the solution.
f. Clear the workbench.
5. Tare the mass of an empty 250 mL beaker and then label it as ‘Unknown A.’
6. Add an aliquot of Unknown A to the beaker and records its mass.
7. Compute the density of Unknown A using the volume and mass data.
8. Repeat Steps 5-7 for Unknown B.
9. Classify the unknowns using the table in the introduction of the lab.
Alcohol Density Problem
QEP Critical Thinking Assignment
CHE-121: Principles of Chemistry 1
Notes
This section should include notes about any observations or data collected during the lab.
Alcohol Density Problem
QEP Critical Thinking Assignment
CHE-121: Principles of Chemistry 1
Data
This section will include all data collected during the lab.
Alcohol Density Lab
Critical Thinking Pre-Lab Lesson
Principles of Chemistry I (CHE-121)
Georgia Military College
Critical thinking is an active, self-reflective, and deliberate attempt to use
cognitive skills to support decision making, problem solving, and mastery
of concepts throughout various contexts.
ProCon.org. “Quotes about Critical Thinking.” ProCon.org. 15 Aug. 2014. Web. 17 Sep. 2014.
There are several reasoning skills needed to successfully
apply critical thinking strategies to chemistry.
Reasoning Skill
Definition
Analysis*
Detailed examination of the structure or components
of some subject or situation, particularly as it relates
to reasoning and interpretation
Inference*
Drawing conclusions from reasons, prior
experiences, and evidence
Evaluation
Assess the credibility of sources of information and the
claims they make.
Deduction
Decision making in precisely defined contexts
Induction*
Decision making in contexts of uncertainty relies on
inductive reasoning
*Items in bold will be emphasized in the lab.
The analysis of data is critical in chemistry and all
of science.
• Identify patterns and trends in data.
• Distinguish outliers.
• Focus on the important components
in a set.
• Identify correlations.
To infer the outcome of an experiment involves
making a hypothesis.
• Draw conclusions based on collected
data, lab observations, and prior
research.
• Eliminate presuppositions and
assumptions using valid scientific
evidence.
• Develop one or more viable lab
procedures to test an observable.
The analysis of data is critical in chemistry and all
of science.
• Draw inferences about what we think
is probably true based on analogies,
case studies, prior experience,
statistical analyses, simulations,
hypotheticals, and patterns
recognized in familiar objects, events,
experiences, and behaviors.
• Evaluate the validity of the procedure
and results – this is prior experience.
Your understanding of the reasoning skills (analysis,
inference, and induction) will be assessed in this lab.
Pre-Lab
• Introduction
to the
relevant
reasoning
skills and
purpose of
the lab.
Inference
• Establish
prior
knowledge
by gaining
familiarity
with the lab
environment
and purpose
of the lab.
• Generate a
hypothesis.
Analysis
• Conduct the
experiment
under the
given
parameters
and acquire
relevant
data.
• Analyze
data.
Induction
• Generate a
report of
your
findings.
• Make
scientifically
sound
conclusions.
• Validate or
invalidate
originally
hypothesis.
This week’s laboratory will require you to analyze unknown samples for their alcohol concentrations. In
order to do this, you will need knowledge of gravimetric analysis, so we will discuss some of the facets of
that topic. Your initial post to the forum should be in response to the following:
Describe the relationship between reaction yield, theoretical yield, and percent composition and
their relationships to gravimetric and volumetric analyses.
1. Define one of the four types of chemical reactions and include an example reaction in the form of the
complete molecular equation.
2. Explain the meaning of oxidation states and provide an explanation of how to determine them.
3. Further the discussions of your peers by elaborating on the other three types of chemical reactions.
Your subsequent four posts to your peers and/or your instructor should further the discussion by
elaborating on the objectives above. Do not include any results for your laboratory experiments.
References must be provided for any content retrieved from credible sources.
Example Discussion Forum Assignment for Online Class
Lab Assignment
• Goal:
• Determine alcohol content of unknown solutions.
• Learning Objectives:
• Practice computing the densities of unknown solutions volumetrically and
gravimetrically.
• Practice recording data and taking notes from experimental procedures.
• Analyze data to make valid scientific conclusions.

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