Post on 14-Jan-2016
Experiment 7Chemicals in Everyday Life
Demonstrations and Lab Bench Work
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Purpose of This Experiment
• Make accurate observations for a chemical reaction
• Figure out what the products of the chemical reaction are
• Work in groups of 2
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Terminology for Observations
Gas Formation – bubbles are formed, solution fizzes
Solid Formation, Precipitate Formation– solution becomes cloudy, solid material forms and may settle to the bottom of the test tube (color?)
Color Change – solution may change from one color to another (indicate initial and final colors)
Temperature Change – solution may become warmer or cooler, indicate direction of change
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Determining Product
• Use observations and information in procedure pages for experiment 7
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Part A, Part C, and Part E
• PowerPoint demonstration (students do not do these reactions)
• Make your observations for your report sheet while the PowerPoint is shown
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Parts B, Part D, and Part F
• Do the reactions at your lab bench• Do not stick anything into the reagent bottles
at each bench. Pour reagents into SMALL beakers to use for reactions. (label the beakers)
• Do not return unused reagents to their original bottles. Pour unused reagents into the waste bottles in hoods.
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Part A, Part C, and Part E
The following photos are for the reactions that occur in parts A, C, and E of experiment 7.
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Part A, observation #1Ammonia and dry, red litmus paper
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Red litmus
Part A, observation #2Ammonia and moist, red litmus paper
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Red litmus
Dry Red vs. Moist Red(from previous two slides)
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Dry
Moist
Part A, observation #3Ammonium chloride and moist, red litmus paper
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Part A, observation #4NH4Cl and NaOH and moist, red litmus paper
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Part A, observation #5Fertilizer and NaOH and moist, red litmus paper
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Part A, observation #6Ammonium carbonate and moist, red litmus paper
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Part C, observation #10NaCl and H2SO4 and moist, blue litmus paper
A pungent gas forms, and the blue litmus paper changes color
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Part C, observation #12NaCl and AgNO3 solutions
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Part C, observation #14chloride ions in tap water
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Part C
Part C, observation #15Salt in flame
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Part E, observation #18
bleach NaI and bleach
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Part E, observation #18
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Part E, observation #19NaI and AgNO3 solutions
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Part E, observation #20NaI and H2SO4
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