HO HO OH!
A Hands On Investigation
Of
Hydrogen and Oxygen
And their OH! (WOW)
Properties.
Presenter: Justin Guyer
jguyer@lewistown.k12.mt.us
Fergus High School
SHI 2010
RATIONAL
• Hands-On Activity/High Student Interest
• Multiple science concepts:
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Properties of matter and measurement
Atoms, molecules, and ions
Properties of gases
Stoichiometry
Thermochemistry
Scientific Method
• Apply lab equipment, lab technique, and lab safety
• Portfolio of 36 Labs to compliment High School
Chemistry course
Montana Standards
• Content Standard 1
– Students, through the inquiry process, demonstrate the
ability to design, conduct, evaluate, and communicate
results an reasonable conclusions of scientific
investigations.
• Content Standard 2
– Students, through the inquiry process, demonstrate
knowledge of properties, forms, changes and interactions
of physical and chemical systems.
• Content Standard 6
– Students understand historical developments in science
and technology.
General Instructional Goals
• Students will be able to:
– Collect and test for hydrogen and oxygen gas
– Understand the principles of combustion reactions,
exothermic and endothermic reactions, stoichiometry
of reactions.
– Launch a simple rocket that uses H2 and O2 gases.
• explore and determine the proportions of hydrogen and
oxygen mixture that will achieve the best launch results.
• compare the balanced chemical reaction of hydrogen and
oxygen with their lab results;
– Perform the lab, collect data, and discuss, compare,
and contrast their lab findings .
Topic Sequence
• Electrolysis of water
• Methods of collecting Hydrogen gas
– Properties of hydrogen gas
• Methods of collecting Oxygen gas
– Properties of oxygen gas
• Scientific process of testing the best
hydrogen/oxygen mixture to propel rocket
Materials
• Electrolysis apparatus •
• Tesla coil
•
• Hydrogen peroxide
30%
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• Manganese dioxide •
• Power supply
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• Plastic pipettes
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• Zinc or magnesium
Hydrochloric acid
Test tubes w/1 hole
stoppers
Glass tubes
Syringes
12-gauge copper wire
Water trough and gas
collecting apparatus
Individual lesson Plans
• Day 1 Electrolysis of water
– Classification of matter, properties of gases, chemical
reaction, acidity?
• Day 2 Generation and collection of H2
– Properties of gas, thermochemistry, stoichiometry, gas
laws, chemical reaction
• Day 3 Generation and collection of O2
– Properties of gas, thermochemistry, stoichiometry, gas
laws, chemical reaction
• Day 4 & 5 Process of building and testing rockets
Launching the Rockets
1. Cut the end off of a pipette leaving about 2 cm of stem
attached to the bulb. Place 4 equal marks on bulb of pipette with
permanent marker for ratio use.
2. Immerse the pipette in a pan of water and completely fill the
"rocket" with water.
3. Slowly displace the water with the hydrogen and/or oxygen
gases .(Best method-test tube, glass tubing?)
4. Slip the pipette rocket over a copper wire (12-14 gauge) that is
grounded to Earth until the ends of the copper wire are above
the water in the gas-filled region of the pipette.
5. With some water in the stem, launch the rocket by triggering a
spark with tesla coil.
6. Vary the activity by changing the ratios of gas mixtures, and or
try cutting the tips of the pipettes to two or three different lengths.
Learner Outcomes
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Balancing and type of chemical equations
Stoichiometry
Gas Laws PV=nRT
Error analysis
Physical and chemical properties of hydrogen and oxygen
gas
Understanding of exothermic vs endothermic
Newton’s laws of motion
Vocabulary development
Lab technique and tool usage
Scientific method
Variables
General Objectives/Assessment
• Capstone Project
– Since all concepts will have been learned prior to
doing this unit, students will generate a detailed
lab report incorporating concepts mentioned
before.
Assessment of SHI Project
• Ways to determine success of Project
– Increase of Student scores on tests and quizzes
– Capstone project
– Formal Assessment of student understanding of
vocabulary and concepts while doing the lab.
– Continued increase of students taking chemistry
and AP Chemistry
– HO HO OH!