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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