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NES: Electrolysis of Water:
A Breath of Fresh Air
Presented by: Alissa Keil
December 15, 2011
NASAExplorerSchools
Electrolysis of Water:
A Breath of Fresh Air
Presented by:
Alissa Keil, NES Educational Specialist
Oklahoma State University
NASA Johnson Space Center
Past to Present
NASAExplorerSchools
Electrolysis of Water:
A Breath of Fresh Air
This lesson features:
• educator edition with answer key
• student edition
• NASA Explorer Schools site
http://explorerschools.nasa.gov
NASAExplorerSchools
ISS Expedition 30
NASAExplorerSchools
International Space Station
Environment
Exploration Water Recovery System
View of surface tension
demonstration on board the
International Space Station
Beakers contain fluids
from various stages of
water processing
NASAExplorerSchools
Electrolysis of Water: Breath of Fresh Air
Have you used NASA lessons in your
classroom?
√ Yes
X No
NASAExplorerSchools
Electrolysis of Water: Breath of Fresh Air
Subject Areas
Subject Area:
AP Chemistry
Grade Level:
10-12
NASAExplorerSchools
Electrolysis of Water: Breath of Fresh Air
National Standards
• National Science Education Standards
Science Standards
Physical Science
Science and Technology
History and Nature of Science
NASAExplorerSchools
Electrolysis of Water: Breath of Fresh Air
Introduction
• AP Chemistry
• Lab Activity and Free-Response
Question
• Key Topic: Electrolysis of Water
NASAExplorerSchools
Electrolysis of Water: Breath of Fresh Air
Learning Objectives
In the lab activity: Breath of Fresh Air
Students will:
• construct an electrolytic cell;
• determine the number of moles and mass of oxygen
produced;
• determine the number of electrons transferred; and
• compare their experimental electrolytic cell to the
Oxygen Generator System used on the International
Space Station.
NASAExplorerSchools
Electrolysis of Water: Breath of Fresh Air
Learning Objectives
In the FRQ: Oxygen Generator System
Students will:
• write balanced equations for half reactions;
• predict direction of oxidation-reduction reactions;
and
• determine mass and volume relationship with an
emphasis on mole concepts.
NASAExplorerSchools
Chemistry of Oxygen: Breath of Fresh Air
Class Time Required
The lab activity: Breath of Fresh Air
Requires one 90-minute class period or two
50-minute class periods.
Day 1: go through the background information with
students, have them answer the pre-lab questions and
have them set up for the lab.
Day 2: have students complete the lab and the analysis
questions.
NASAExplorerSchools
Chemistry of Oxygen: Breath of Fresh Air
Class Time Required
The FRQ: Oxygen Generator System
Requires 45 – 60 minutes, part of which could
be assigned for homework.
• Can be used as a follow-up assessment for the lab activity at
the end of the unit or even shortly before the AP exam to
remind students of the learning.
• Can also be used as a stand-alone activity for those who do
not have the required technology to run the lab.
NASAExplorerSchools
Chemistry of Oxygen: Breath of Fresh Air
Technology Used
The Lab activity: Breath of Fresh Air
Requires the use of TI-Nspire technology. Each lab
station will need at least one TI-Nspire handheld with
a Vernier Easylink cable, Vernier Current probe, and
DC source.
NASAExplorerSchools
Electrolysis of Water: Breath of Fresh Air
Technology Used
The FRQ: Oxygen Generator System
Requires only the use of a standard
calculator.
NASAExplorerSchools
Electrolysis of Water: Breath of Fresh Air
Equipment Used for Lab
• TI-Nspire Handheld, Vernier Current Probe,
Vernier EasyLink
• Electrolysis Apparatus – can use a hofman
tube or two graduated gas tubes and
electrodes in a beaker
• Three wires with alligator clips
• 9-12 V DC power source (< 0.5 amperage)
NASAExplorerSchools
Electrolysis of Water: Breath of Fresh Air
TI-Nspire Handheld
CX
Touchpad
Clickpad
NASAExplorerSchools
Electrolysis of Water: Breath of Fresh Air
Vernier
Current Probe and EasyLink
NASAExplorerSchools
Electrolysis of Water: Breath of Fresh Air
DC Source
or
NASAExplorerSchools
Electrolysis of Water: Breath of Fresh Air
Common Misconceptions
What are some common
misconceptions your students make
have about electrolysis?
Type one idea into the chat window.
Questions?
NASAExplorerSchools
Chemistry of Oxygen: Breath of Fresh Air
The NASA Connection
Electrolysis is used on the International Space
Station as part of the Environmental Control and Life
Support Systems.
•
Diagram depiction of the electrolysis
process used in the OGS system in one
of the multiple electrolytic cells
Regenerative Environmental Control and Life Support System Diagram
NASAExplorerSchools
Prototype ECLSS Racks
NASAExplorerSchools
Electrolysis of Water: Breath of Fresh Air
Oxygen Generator System
NASAExplorerSchools
Electrolysis of Water: Breath of Fresh Air
NASAExplorerSchools
Electrolysis of Water: Breath of Fresh Air
Chemicals Used for Lab
Potassium Hydroxide
Each lab station will need to create
100 mL of 3% KOH solution by
dissolving 3 g of KOH in 97 g of
water.
NASAExplorerSchools
Electrolysis of Water: Breath of Fresh Air
Safety Precautions
• Students should wear safety goggles and aprons.
• Students should avoid physical contact with
potassium hydroxide. Potassium hydroxide is a toxic,
corrosive material that causes severe burns to skin,
eyes, respiratory tract, and gastrointestinal tract.
Refer to MSDS sheet when using this material with
your students.
• Students should avoid contact with any bare metal in
the electrical circuit.
NASAExplorerSchools
Electrolysis of Water: Breath of Fresh Air
Why reuse water?
Why reuse water aboard the ISS?
Why reuse water here on Earth?
Type a response for each into the chat box.
Questions?
NASAExplorerSchools
NASAExplorerSchools
Electrolysis of
of Water:
Water: Breath
Breath of
of Fresh
Fresh Air
Air
Electrolysis
Electrolysis of Water:
Breath of Fresh Air
Lab Activity
NASAExplorerSchools
Electrolysis of Water: Breath of Fresh Air
Engage
• Connect activity to previous learning
• Read through Background section with
students encouraging discussion
• Show students the video of interview
with ETHOS flight controller
NASAExplorerSchools
Electrolysis of Water: Breath of Fresh Air
Laws
• Connect activity to previous learning
• Read through Background section with
students encouraging discussion
• Show students the video of interview
with ETHOS flight controller
NASAExplorerSchools
Electrolysis of Water: Breath of Fresh Air
Pre-Lab Questions (TI-Nspire)
NASAExplorerSchools
Electrolysis of Water: Breath of Fresh Air
Pre-Lab Questions
and Lab Set-Up
•
•
•
•
Open tns file on handhelds.
Complete pre-lab questions.
Set up lab.
If 60-minute class or shorter, this is a
good stopping point.
NASAExplorerSchools
Electrolysis of Water: Breath of Fresh Air
Pre-Lab Questions
• Students will open tns file that you have
distributed to their TI-Nspire handhelds.
• Students then complete pre-lab
questions.
• Students can answer all questions using
their handhelds or they may answer the
questions on the provided student
edition.
NASAExplorerSchools
Electrolysis of Water: Breath of Fresh Air
Lab Set-Up
• Once students are finished with pre-lab
questions, they can then set up their lab
station.
• Project lab set-up diagram and walk through
the set-up with the students.
• If 60-minute class or shorter, this is a good
stopping point.
NASAExplorerSchools
Electrolysis Station Set-up
NASAExplorerSchools
Electrolysis of Water: Breath of Fresh Air
NASAExplorerSchools
NASAExplorerSchools
NASAExplorerSchools
Electrolysis of Water: Breath of Fresh Air
NASAExplorerSchools
NASAExplorerSchools
Electrolysis of Water: Breath of Fresh Air
Lab Activity
• As students work on the lab, encourage discussion on
what is happening.
• Some questions you might ask as you monitor: Which one
is oxygen? Which one is hydrogen? Which electrode is
positive lead, which is negative?
• Once students have collected the data from the lab, they
can work with their partners on the analysis section.
• Although one handheld was used for collection, all
students in group use their handhelds to complete the
assignment.
NASAExplorerSchools
Chemistry of Oxygen: Breath of Fresh Air
Lab Wrap-up
• Discuss learning that occurred from the
experience
• Reinforce the NASA connection
• Discuss possible reason for error
• Discuss any interdisciplinary connections
NASAExplorerSchools
Electrolysis of Water: Breath of Fresh Air
Oxygen Generator FRQ
NASAExplorerSchools
Electrolysis of Water: Breath of Fresh Air
• Format very similar to freeresponse questions on AP exams
• Can be used as a follow up to the
lab or as a stand-alone problem
• Scoring guide provided that is
also very similar to what students
will see on the AP exam
NASAExplorerSchools
Electrolysis of Water: Breath of Fresh Air
FRQ Scoring Guide
NASAExplorerSchools
Electrolysis of Water: Breath of Fresh Air
How might you use journaling and note
taking during this lesson?
Please type your ideas into
the chat window.
NASAExplorerSchools
Electrolysis of Water: Breath of Fresh Air
If you have taught electrolysis in the
classroom before – what other types of
lessons do you use?
Please type your ideas into
the chat window.
NASAExplorerSchools
Electrolysis of Water: Breath of Fresh Air
Extensions
NASAExplorerSchools
Electrolysis of Water: Breath of Fresh Air
Math and Science @ Work
Project
• More AP Chemistry activities as well as
activities for Physics, Biology, Calculus, and
Statistics can be found at the Math and
Science @ Work website
www.nasa.gov/education/mathandscience
• Just search by subject and scroll down until
you find the activities you are looking for
NASAExplorerSchools
Electrolysis of Water: Breath of Fresh Air
TI Science Nspired
• TI-Nspire is a handheld that can contain documents with data
collection, simulations, assessment, and calculator
functionality.
• TI-Nspire is also software that can be used in the same way as
the handheld but can also be used for writing reports from the
data gathered.
• Activities for TI-Nspire can be found in two different locations.
(NASA and TI)
• Activities are available for chemistry, physics, and biology, as
well as all math topics.
• TI Science Nspired Website
www.education.ti.com/calculators/tisciencenspired/
NASA Explorer Schools
http://explorerschools.nasa.gov/
NASA Explorer Schools
http://explorerschools.nasa.gov
NASA Now Videos
• NASA Now:
International
Space Station
Payload
Operations
• NASA Now:
Expedition 27
• NASA Now: Human
Research on the
ISS
NASA Resources
ISS Sightings
http://spaceflight.nasa.gov/realdata/sightings/index.html
Space Station Research for Teachers
http://www.nasa.gov/mission_pages/station/research/research_teacher.ht
ml
Saturday Morning Science
http://spaceflight.nasa.gov/station/crew/exp6/spacechronicles_videos.html
Questions?
NASAExplorerSchools
International Space Station Tour (Part II)
Oxygen Generator System
Support & Collaboration
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