1. Experiment 7 Chemicals in Everyday Life
Demonstrations and Lab Bench Work
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2. 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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3. 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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4. Determining Product
Use observations and information in procedure pages for experiment 7
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5. 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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6. 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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7. 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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8. Part A, observation #1 Ammonia and dry, red litmus paper
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9. Part A, observation #2 Ammonia and moist, red litmus paper
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10. Dry Red vs. Moist Red (from previous two slides)
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11. Part A, observation #3 Ammonium chloride and moist, red litmus paper
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12. Part A, observation #4 NH4Cl and NaOH and moist, red litmus paper
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13. Part A, observation #5 Fertilizer and NaOH and moist, red litmus paper
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14. Part A, observation #6 Ammonium carbonate and moist, red litmus paper
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15. Part C, observation #10 NaCl and H2SO4 and moist, blue litmus paper
A pungent gas forms, and the blue litmus paper changes color
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16. Part C, observation #12 NaCl and AgNO3 solutions
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17. Part C, observation #14 chloride ions in tap water
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18. Part C, observation #15 Salt in flame
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19. Part E, observation #18
bleach
NaI and bleach
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20. Part E, observation #18
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21. Part E, observation #19 NaI and AgNO3 solutions
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22. Part E, observation #20 NaI and H2SO4
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