Atoms, Elements, and the Periodic Table - Learning Services Home

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Name Date Class(continued)Hands-On ActivitiesData and ObservationsSubstanceto be Tested1. Cornstarch2. Sugar3. Baking soda4.Mystery mixIdentifying Presence of CompoundsFizzes withVinegarTurns Bluewith IodineMelts WhenHeatedAnalyze Your Data1. Identify from your data table which compound(s) you have.Conclude and Apply1. Describe how you decided which substances were in your unknown mixture.2. Explain how you would be able to tell if all three compounds were not in your mystery mixturesubstance.3. Draw a Conclusion What would you conclude if you tested baking powder from your kitchenand found that it fizzed with vinegar, turned blue with iodine, and did not melt when heated?Communicating Your DataMake a different data table to display your results in a new way. For more help, refer tothe Science Skill Handbook.Copyright © Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Inc.8 Atoms, Elements, and the Periodic Table
Name Date Class1LaboratoryActivityMixtures and CompoundsMatter is anything that has mass and occupies space. Matter exists in different forms. Threeclassifications of matter are well known to us: elements, mixtures, and compounds. Elements arethe basic materials of our world. Elements in a mixture have recognizable boundaries and can beseparated by mechanical means. Elements that form a chemical compound can be separated onlyby a chemical process. The element oxygen(O) combines with the element hydrogen (H) to formwater (H 2 O), which is a compound. Salt water is a mixture of two compounds, water and salt.StrategyYou will separate a mixture into its parts.You will compare the characteristics of a compound and a mixture.Hands-On ActivitiesCopyright © Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Inc.Materialsmagnifying glass watersand (coarse) disposable pie pans (2)granite rockrock saltgranite (crushed) heat sourceProcedure1. Use the magnifying glass to observe thesand and granite rock. Sketch the granitewith the minerals in it, and the shapes of thesand grains under Sketch A.2. Sort the crushed granite into separate pilesaccording to color.3. Sketch the general shape of a piece fromeach pile of the sorted granite, and labeleach as to color under Sketch B.4. Mix a spoonful of sand in some water in apie pan. Sketch what you observed underSketch C.Data and Observations5. Examine and sketch the salt crystals underSketch D. WARNING: Do not ingest rocksalt. It might contain harmful impurities.6. Mix a spoonful of salt in some water in thesecond pie pan. Record your observations.7. Heat both pans until the water is evaporated.Sketch what is left in each pan underSketch E. WARNING: Be careful not to getclothes or hair close to the heat source.Atoms, Elements, and the Periodic Table 9
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