<p>South Pasadena • Chemistry Name Period Date 5 · Chemical Reactions H O L I D A Y C H E M I S T R Y</p><p>Ornament Lab 1. Galvanized iron is Iron (symbol ____) coated 8. Oxidation: with the active metal, ______(____). the charge is more ______(positive/negative) electrons are ______(gained/lost) 2. Iron rusts, which means it combines with oxygen and water. Reduction: Iron(II) oxide = ______the charge is more ______(positive/negative) Iron(III) oxide = ______electrons are ______(gained/lost)</p><p>3. Rust flakes off the surface of iron exposing more iron for corrosion. Zinc, forms zinc oxide 9. Fe + O2  Fe2O3 ______, that stays on the surface and What is oxidized? _____  _____ protects the metal. What is reduced? _____  _____ 4. Write the balanced equation for the reaction when the ornament was placed in the beaker of 3M HCl. 10. Zn + 2HCl  ZnCl2 + H2(g) What is oxidized? _____  _____ What is reduced? _____  _____</p><p>2+ 2+ 5. Write the balanced equation for the reaction 11. Fe + Cu  Cu + Fe when the Q-tip of Cu2+ touched the exposed What is oxidized? _____  _____ iron surface. What is reduced? _____  _____</p><p>6. Sketch one side of your ornament here: Chemist’s Tree Demo 12. Copper wire (_____) is placed in a solution of silver nitrate (______)</p><p>13. The reaction is:</p><p>14. What is oxidized? _____  _____ What is reduced? _____  _____</p><p>Oh Chemist’s Tree, Oh Chemist’s Tree, 7. When you look at your ornament, you can see Thou copper limbs are silvery. brown areas that are ______( ____) When silver gains electrons free, and shiny areas that are ______(____). No longer ion will they be.</p><p>The copper’s metal… sweet and nice, But silver steals its electrons… twice. Oh Chemist’s Tree, Oh Chemist’s Tree, Form copper ions, oxidatively. South Pasadena • Chemistry Name Period Date 5 · Chemical Reactions O R N A M E N T L A B</p><p>1. Put on your goggles.</p><p>2. Use a razor blade or X-acto knife to cut out your design. The exposed areas will eventually be dark. The covered areas will remain shiny and silvery.</p><p>The Chemistry:</p><p>3. Lower the ornament into the yellow hydrochloric acid (3M) solution. Bubbles will form on the surface. When the rapid bubbling is finished (3-5 minutes) use tongs to remove the ornament to a paper towel. Do not rinse… yet.</p><p>4. Dip a Q-tip into the blue copper sulfate solution. Paint the exposed iron metal surface with the solution. A copper color appears. Hint: If the copper color does not appear, or is uneven, placing the ornament back into the acid solution. Placing the ornament into the rinse water may also help. Experiment.</p><p>5. Briefly rinse the ornament in the tray of water.</p><p>Finishing:</p><p>6. Remove the blue tape (please throw the tape away… don’t leave it on the lab table). Hold your ornament by the edges… the copper can be rubbed off.</p><p>7. Round off the sharp corners using the tin snips over the green tray.</p><p>8. Have your teacher drill a hole in the ornament for you.</p><p>9. Open a paper clip into an “S” shape and hang your ornament so it can be sprayed LIGHTLY with the clear acrylic spray.</p><p>10. Hang your ornament on the string to dry. It only takes a few minutes. Look around your lab area to make sure you have cleaned up your mess.</p>