Transcript Hydrogen as Energy Carrier Part 1 Powerpoint

UCLA Science and Engineering of the Environment GK-12
Warm-up
Homework
Finish the lab worksheet.
A. Get out a sheet of paper / your lab notebook.
B. Write down the following definitions:
• Reaction – A process where elements or compounds undergo a chemical
change. In a reaction, atoms are rearranged into different combinations
of molecules.
• Electrolysis – A reaction which uses electricity to force the chemical
change
• Voltage – A measure of the energy of the electrons in electricity
• Current – The rate of electrons flowing in electricity
• Power – The rate at which energy is used in an electrical device
C. Keep your sheet of paper out and take notes with it
UCLA Science and Engineering of the Environment GK-12
Electricity is the Flow of Electrons
e-
ee-
= Flow of electrons
Power equals Current times Voltage
P=IxV
UCLA Science and Engineering of the Environment GK-12
The Hindenburg Disaster
UCLA Science and Engineering of the Environment GK-12
Hydrogen: The Smallest Element
Hydrogen atom:
Hydrogen
molecule:
= H = 1 proton + 1 electron
H
H
H
= H2
Hydrogen has three isotopes; regular Hydrogen (no
neutrons), Deuterium (one neutron), and Tritium (two
neutrons). Deuterium and Tritium are the “Hydrogen” in
a Hydrogen (fusion) bomb.
Hydrogen atoms make up about ¾ of the visible universe (by mass)
UCLA Science and Engineering of the Environment GK-12
Dead White Dudes
Henry Cavendish – Great Britain
Discovered Hydrogen in 1766.
Antoine Lavoisier – France
Gave Hydrogen its name in 1788.
From Latin: “Hydro” = water “Genes” = born of
(burning Hydrogen makes water)
UCLA Science and Engineering of the Environment GK-12
Hydrogen can be Used as Fuel
• Hydrogen gas can be used to power an
engine or a fuel cell to run a car
• Liquid Hydrogen is used to launch the space
shuttle (with liquid oxygen)
• Solid Hydrogen (Deuterim or Tritium) can
be used for nuclear fusion experiments
UCLA Science and Engineering of the Environment GK-12
Electrolysis – Electricity + Water
e-
ee-
+
+
↓
+
+
UCLA Science and Engineering of the Environment GK-12
Electrolysis Experiment
“Red” test tube
Power Supply
(electricity source)
“Black” test tube
Electrolyzer