UCLA Science and Engineering of the Environment GK-12 Warm-upHomework A.Get out a sheet of paper / your lab notebook. B. Write down the following definitions:

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UCLA Science and Engineering of the Environment GK-12 Warm-upHomework 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 Finish the lab worksheet.

UCLA Science and Engineering of the Environment GK-12 Electricity is the Flow of Electrons Power equals Current times Voltage P = I x V e- e-e- = Flow of electrons

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 HH Hydrogen atom: Hydrogen molecule: H = H = 1 proton + 1 electron = H 2 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 Antoine Lavoisier – France Gave Hydrogen its name in 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- e-e- + ↓ + + +

UCLA Science and Engineering of the Environment GK-12 Electrolysis Experiment Power Supply (electricity source) Electrolyzer “Red” test tube “Black” test tube