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8 reaction lab

8 reaction lab. Safety Precautions. Concentrated Hydrochloric acid will be used in this lab therefore: Wear apron at all times Wear goggles at all times If you get acid on your fingers, rinse off immediately with copious amounts of water. Safety Precautions.

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8 reaction lab

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  1. 8 reaction lab

  2. Safety Precautions Concentrated Hydrochloric acid will be used in this lab therefore: • Wear apron at all times • Wear goggles at all times • If you get acid on your fingers, rinse off immediately with copious amounts of water.

  3. Safety Precautions • Do not look directly at magnesium flame. • Turn Bunsen burner off when not in use.

  4. Lab Notebook • Title • Purpose • Procedure for each rx • Observations of reactants and products • Balanced equation and indicate rx type.

  5. Reaction 1 • Use fine sandpaper to clean a piece of copper wire, note appearance of wire. Using crucible tongs, hold the wire in the hottest part of a flame for 1 minute. Note any changes in appearance.

  6. Reaction 2 • Using crucible tongs, hold a piece of magnesium wire in the hottest part of a flame until it ignites. • Once ignition has occurred hold wire over a watch glass. Do not look directly at the flame! • Examine the contents and note observations about the product.

  7. Reaction 3 • Place 1/2 heaping scoop spatula of copper(II)carbonate into a clean, dry, large test tube. Note appearance of powder. Heat T.T. in B.B. using T.T. holder for 1 minute or so-- watch carefully and note all changes.

  8. Reaction 3 • If you look carefully, you will notice that a gas is being produced. How can you tell? After 1 minute insert a “burning splint” into T.T. Is combustion supported? How can you tell?

  9. Reaction 3 • Examine remaining contents in test tube. Note changes; describe appearance of contents. • Dispose of product in trash can after it cools.

  10. Reaction 4 • Place a small piece of zinc in a small test tube. Hold tt with tt holder • Add about 1 pipette of hydrochloric acid. • Wait 10 sec, invert second tt over 1st tt. • Return to lab station • Note any energy changes, note if formation of gas bubbles, etc. • Avoid inhalation of vapors, keep away from nose. • Must have a clean dry test tube..Why?

  11. Reaction 4 • Place tt in tt rack • Hold inverted tube with tt holder • Collect gas for at least 1 minute • Raise inverted tube, quickly insert burning splint. Record observations

  12. Reaction 4 • Carefully pour acid into the sink, then carefully wash acid down sink with water, avoid splashing. • Rinse off remaining zinc pieces and return to small beaker in fume hood.

  13. Reaction 5 • Place a small nail in a small tt, place enough copper(II) sulfate in tt to just cover the nail. Note appearance of solution and nail (Fe), both before and after reaction.(You may wish to place an un-reacted sample of copper sulfate next to the product for a comparison). Place used nail on paper towel in fume hood. Pour copper sulfate back into bottle.

  14. Reaction 6 • Add about 2 pipettes of zinc acetate to a clean test tube. Next add about 2 pipettes of sodium phosphate. Note appearance of 2 solutions before, immediately after mixing and again after 15+ minutes have expired. • Note any changes? Rinse down sink.

  15. Reaction 7 • Place 2 pipettes full of hydrogen peroxide into a small test tube. • Add a pinch of yeast. Tiny amount • Put thumb on top of tube, shake a little • Note changes • Wait about 1 minute. • Plunge a glowing splint into the test tube, don’t drop it. Note changes.

  16. Reaction 8 • Place about 2 ml of tap water in a large test tube. • Add 1 drop of universal indicator.(Note color of solution) Look at pH chart. Report pH • Blow bubbles GENTLY into water with straw until you see a color change. The indicator is an acid-base indicator! It will turn yellow if a weak acid is present and red if the acid is a little stronger. Blue means a base is present.. Report pH.

  17. Reaction 9 • Heat tube with BB, point away from everyone and report what happens. Write the reaction.

  18. Wash hands • Wash hands, put away equipment, wash glassware.

  19. Gas tests • A burning splint that goes out indicates the presence of carbon dioxide. • A glowing splint that bursts into flames indicates oxygen. • A burning splint that makes a “whoop” sound indicates hydrogen.

  20. Evidence of a ChemicalReaction • Release of a gas • Color change • Formation of a precipitate Video • A solid that forms (cloudy) out of an aqueous solution and eventually falls to the bottom of the test tube by gravity. • Absorption or release of energy, light

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