Elements, Compounds, and Mixtures
LAB PROGRAMMr. SchaefferUnit 2 Basics of MatterElements, Compounds, and MixturesSkills Using models Using a Dichotomous key Classifying matter 3152775111760BackgroundThis exercise uses a models and a dichotomous key to help you classify the contents of 7 plastic baggies and 12 small vials into the proper type of matter. The classification of matter is a fundamental step in physical science. You cannot directly observe all of the traits you will be looking for, you must use your own knowledge of things and any other information your teacher has given you.ProcedurePart One: Learning the Nuts and BoltsLook at the plastic bags labeled A – G.Each bag contains a model for atoms and molecules using nuts, bolts, and washersWrite the formulas for the contents of each bag using B= bolt, N= nut, and W= washer. For example if there are just 2 nuts you would write 2 N, if there was three bolts each with 2 nuts on them then it would be 3 BN2. If these two combinations are in the bag together then write 2 N and 3 BN2.Next decide if the baggie contains a mixture or a pure substance. Record on the data tableThen decide if the pure substances are elements or compounds. For the mixtures is it a mixture of elements, a mixture of compounds, or a mixture of bothEach nut bolt and washer represents an atom count and record the total number of atoms in each baggie.Molecules are groups of atoms that are chemically bonded. How many molecules are in each bag?Understanding might take a VialLook at the contents of the vial.Read number one on the dichotomous key on the back of the page.If your observations agree with a. go to question 2 as it says if they agree with b. you are observing energy and write that on your Data table.For each vial make the observations and follow the directions on the key until you get to a step that does not tell you to go to another observation.Then label the contents as an element, compound, homogeneous mixture, solution, heterogeneous mixture, or suspension.When you are finished answer the questions and turn in your answer sheetJustify your answer by using the number and letter of each statement that led you to the correct classification for the substance. A Dichotomous Key:The Classification of Matter1. a. The contents of the vial have mass and take up spacego to 2.b.The contents of the vial do not have mass or take up spaceENERGY2a. The contents of the vial are a mixture of different substancesgo to 3.b.The contents of the vial are a single substance that has a definite composition. go to 6.3a.The contents of the vial look to be the same everywhere that you look. The sample is uniform throughoutgo to 5.b.The contents of the vial vary from one part of a sample to another. The traits from one part of the sample to another are differentgo to 4.4 a. The contents of the vial may appear when shaken, but solid particles will settle out of the liquid portion over time.SUSPENSIONb.The contents of the vial visibly vary in composition.HETEROGENEOUS MIXTURE5 a. The particles of this homogeneous mixture are atoms, ions or molecules; and they form a transparent mixture.SOLUTIONb.The particles of the homogeneous mixture are larger than molecules, they make the mixture appear cloudy or milky.COLLOID6 a. The substance in the vial is made up of a single type of atom and is on the periodic table ELEMENTb.The substance in the vial is made up of two or more atoms chemically combined in a fixed POUNDLAB PROGRAMMr. SchaefferUnit 2 Basics of MatterElements, Compounds, and Mixtures Part one: Learning the Nuts a BoltsBAG #Formula or FormulasPure Substance or Mixture?Element, Compound, or both?# of Atoms# of MoleculesA B CDEFGPart Two: Understanding Might Take a VialVial #ContentsWhat is it?1.Gravel2.Sugar3.Salt in water4.Sulfur5.Lead 6.Beads7.Milk of magnesia8.Sand9.Copper10.Water11.Bromthymol blue in water12.GlueAnalyze How is a compound different from an element?What is a mixture?If you know the name of a substance, how can you find out whether it is an element?How is a compound different from a mixture? ................
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