How can we identify and classify an unknown material using its physical properties?<\/em><\/p>\n\n\n\n Answer the driving question using: “if… then… because…”<\/mark><\/em><\/p>\n\n\n\n Students will classify everyday objects as metals, non-metals, or alloys by observing and testing their physical properties and using a dichotomous classification key.<\/p>\n\n\n\n By the end of the investigation, I can:<\/p>\n\n\n\n <\/p>\n\n\n\n Choose several objects from the container.<\/p>\n\n\n\n Do not use the classification key yet.<\/strong><\/p>\n\n\n\n For each object, carefully observe its physical properties.<\/p>\n\n\n\n Record:<\/p>\n\n\n\n Use the available tests to collect evidence.<\/p>\n\n\n\n Bring the magnet close to the object.<\/p>\n\n\n\n Record:<\/p>\n\n\n\n Attracted \/ Not attracted<\/strong><\/p>\n\n\n\n Remember: Not all metals are magnetic.<\/p>\n<\/blockquote>\n\n\n\n Carefully determine whether the object can bend.<\/p>\n\n\n\n Record:<\/p>\n\n\n\n Flexible \/ Rigid<\/strong><\/p>\n\n\n\n Do not force or damage the objects.<\/p>\n<\/blockquote>\n\n\n\n Observe the object’s surface.<\/p>\n\n\n\n Record:<\/p>\n\n\n\n Shiny \/ Dull<\/strong><\/p>\n\n\n\n Compare the object’s hardness with other objects.<\/p>\n\n\n\n Record:<\/p>\n\n\n\n Hard \/ Soft<\/strong><\/p>\n\n\n\n Compare objects of similar size.<\/p>\n\n\n\n Record:<\/p>\n\n\n\n Relatively heavy \/ Relatively light<\/strong><\/p>\n\n\n\n If your teacher provides an appropriate conductivity tester, test the objects.<\/p>\n\n\n\n Record:<\/p>\n\n\n\n Conductive \/ Poor conductor<\/strong><\/p>\n\n\n\n Now use the evidence you collected to classify each object.<\/p>\n\n\n\n Follow the key from the beginning.<\/p>\n\n\n\n Do not skip questions.<\/strong><\/p>\n\n\n\n If the evidence is insufficient to make a decision, return to the object and perform another observation or test.<\/p>\n\n\n\n 1A. Does the object show metallic properties?<\/strong><\/p>\n\n\n\n Examples of metallic properties include:<\/p>\n\n\n\n YES \u2192 Go to 2<\/strong><\/p>\n\n\n\n NO \u2192 Go to 7<\/strong><\/p>\n\n\n\n YES \u2192 CLASSIFY AS: METAL<\/strong><\/p>\n\n\n\n Examples:<\/p>\n\n\n\n NO \/ UNSURE \u2192 Go to 3<\/strong><\/p>\n\n\n\n YES \u2192 CLASSIFY AS: ALLOY<\/strong><\/p>\n\n\n\n Examples:<\/p>\n\n\n\n NO \/ UNSURE \u2192 Go to 4<\/strong><\/p>\n\n\n\n Consider:<\/p>\n\n\n\n YES \u2192 Go to 5<\/strong><\/p>\n\n\n\n NO \/ UNSURE \u2192 Go to 6<\/strong><\/p>\n\n\n\n YES \u2192 CLASSIFY AS: ALLOY<\/strong><\/p>\n\n\n\n NO \/ INSUFFICIENT EVIDENCE \u2192 Ask for additional information or perform another test.<\/strong><\/p>\n\n\n\n YES \u2192 CLASSIFY AS: METAL<\/strong><\/p>\n\n\n\n NO \u2192 Ask for additional information or perform another test.<\/strong><\/p>\n\n\n\n Examples:<\/p>\n\n\n\n YES \u2192 CLASSIFY AS: NON-METAL<\/strong><\/p>\n\n\n\n NO \/ UNSURE \u2192 Collect additional evidence.<\/strong><\/p>\n\n\n\n Appearance alone is not enough to identify a material.<\/strong><\/p>\n\n\n\n For example:<\/p>\n\n\n\n Scientists use multiple properties and multiple pieces of evidence<\/strong> to identify materials.<\/p>\n\n\n\n Choose three objects<\/strong> that were difficult to classify.<\/p>\n\n\n\n For each object, complete:<\/p>\n\n\n\n My classification:<\/strong> ______________________<\/p>\n\n\n\n Evidence 1:<\/strong><\/p>\n\n\n\n Evidence 2:<\/strong><\/p>\n\n\n\n Evidence 3<\/strong><\/p>\n\n\n\n Therefore, I classified this object as __________________ because..<\/strong><\/p>\n\n\n\n Answer the questions using complete scientific sentences.<\/p>\n\n\n\n 1. Which physical properties were most useful for distinguishing metals from non-metals?<\/p>\n\n\n\n 2. Was magnetism a reliable way to identify all metals? Explain.<\/p>\n\n\n\n 3. Why is it important to use more than one physical property when classifying a material?<\/p>\n\n\n\n 4. Why might two objects made from metals have very different properties?<\/p>\n\n\n\n 5. What is an alloy?<\/p>\n\n\n\n 6. Why are alloys often used instead of pure metals?<\/p>\n\n\n\n 7. How can changing the composition of a material change its properties?<\/p>\n\n\n\n 8. Which objects in your collection were most difficult to classify? Why?<\/p>\n\n\n\n 9. Did any object look like a metal but turn out to be a non-metal? Explain how your tests helped you identify it.<\/p>\n\n\n\n 10. Did any objects look similar but receive different classifications? What does this tell you about using appearance to identify materials?<\/p>\n\n\n\n Answer the questions below using complete scientific sentences and evidence collected during the investigation.<\/p>\n\n\n\n 1. Which physical properties were the most useful for classifying the objects? Explain why.<\/p>\n\n\n\n 2. How did the classification key help you identify and classify the materials?<\/p>\n\n\n\n 3. What evidence allowed you to distinguish metals from non-metals?<\/p>\n\n\n\n 4. Why is it important to use several physical properties instead of only one when classifying materials?<\/p>\n\n\n\n 5. What are the main differences between metals, non-metals, and alloys?<\/p>\n\n\n\n 6. Why are alloys often preferred over pure metals in everyday applications?<\/p>\n\n\n\n 7. Was your initial hypothesis correct, partially correct, or incorrect? Use evidence from the investigation to justify your answer.<\/p>\n\n\n\n 8. How does understanding the properties of materials help engineers and designers choose the best material for a specific product?<\/p>\n\n\n\n Driving Question: How can we identify and classify an unknown material using its physical properties? Hypothesis: Answer the driving question...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[2],"tags":[],"_links":{"self":[{"href":"https:\/\/madeinscience.com\/lab\/wp-json\/wp\/v2\/posts\/1115"}],"collection":[{"href":"https:\/\/madeinscience.com\/lab\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/madeinscience.com\/lab\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/madeinscience.com\/lab\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/madeinscience.com\/lab\/wp-json\/wp\/v2\/comments?post=1115"}],"version-history":[{"count":3,"href":"https:\/\/madeinscience.com\/lab\/wp-json\/wp\/v2\/posts\/1115\/revisions"}],"predecessor-version":[{"id":1119,"href":"https:\/\/madeinscience.com\/lab\/wp-json\/wp\/v2\/posts\/1115\/revisions\/1119"}],"wp:attachment":[{"href":"https:\/\/madeinscience.com\/lab\/wp-json\/wp\/v2\/media?parent=1115"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/madeinscience.com\/lab\/wp-json\/wp\/v2\/categories?post=1115"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/madeinscience.com\/lab\/wp-json\/wp\/v2\/tags?post=1115"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\n\n\n\nHypothesis: <\/h2>\n\n\n\n
\n\n\n\nLearning Objective:<\/h2>\n\n\n\n
Success Criteria:<\/h2>\n\n\n\n
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\n\n\n\nMaterials:<\/h2>\n\n\n\n
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PROCEDURES:<\/h2>\n\n\n\n
PART 1 \u2014 OBSERVE BEFORE YOU TEST<\/h2>\n\n\n\n
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Vocabulary Bank<\/h3>\n\n\n\n
Property<\/th> Useful vocabulary<\/th><\/tr><\/thead> Luster<\/td> shiny \/ dull<\/td><\/tr> Texture<\/td> smooth \/ rough<\/td><\/tr> Hardness<\/td> hard \/ soft<\/td><\/tr> Flexibility<\/td> flexible \/ rigid<\/td><\/tr> Magnetic response<\/td> magnetic \/ non-magnetic<\/td><\/tr> Density<\/td> light \/ heavy for its size<\/td><\/tr> Electrical conductivity<\/td> conductor \/ poor conductor<\/td><\/tr> Thermal conductivity<\/td> good conductor \/ poor conductor<\/td><\/tr> Malleability<\/td> can be hammered or flattened \/ breaks or cracks<\/td><\/tr> Appearance<\/td> metallic \/ non-metallic<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\n\n\n\nPART 2 \u2014 TEST THE OBJECTS<\/h2>\n\n\n\n
Test 1 \u2014 Magnetism<\/h3>\n\n\n\n
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Test 2 \u2014 Flexibility<\/h3>\n\n\n\n
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Test 3 \u2014 Surface and Luster<\/h3>\n\n\n\n
Test 4 \u2014 Hardness<\/h3>\n\n\n\n
Test 5 \u2014 Mass and Size<\/h3>\n\n\n\n
Test 6 \u2014 Conductivity<\/h3>\n\n\n\n
\n\n\n\nPART 3 \u2014 USE THE CLASSIFICATION KEY<\/h2>\n\n\n\n
\n\n\n\nDICHOTOMOUS CLASSIFICATION KEY<\/h2>\n\n\n\n
START<\/h3>\n\n\n\n
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2. Is the object made primarily of a single metallic element?<\/h3>\n\n\n\n
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3. Does the material contain two or more elements, including at least one metal?<\/h3>\n\n\n\n
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4. Does the object have properties that are different from those expected for a pure metal?<\/h3>\n\n\n\n
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5. Could the different properties result from combining metals or a metal with another element?<\/h3>\n\n\n\n
6. Is there enough evidence to identify the material as a pure metal?<\/h3>\n\n\n\n
7. Does the material show mainly non-metallic properties?<\/h3>\n\n\n\n
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IMPORTANT SCIENTIFIC NOTE<\/mark><\/h2>\n\n\n\n
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\n\n\n\nPART 4 \u2014 CLASSIFICATION TABLE<\/h2>\n\n\n\n
Object<\/th> Metallic properties?<\/th> Magnetic?<\/th> Shiny?<\/th> Hard?<\/th> Flexible?<\/th> Conductive?<\/th> Final classification<\/th><\/tr><\/thead> Object 1<\/td> <\/td> <\/td> <\/td> <\/td> <\/td> <\/td> <\/td><\/tr> Object 2<\/td> <\/td> <\/td> <\/td> <\/td> <\/td> <\/td> <\/td><\/tr> Object 3<\/td> <\/td> <\/td> <\/td> <\/td> <\/td> <\/td> <\/td><\/tr> Object 4<\/td> <\/td> <\/td> <\/td> <\/td> <\/td> <\/td> <\/td><\/tr> Object 5<\/td> <\/td> <\/td> <\/td> <\/td> <\/td> <\/td> <\/td><\/tr> Object 6<\/td> <\/td> <\/td> <\/td> <\/td> <\/td> <\/td> <\/td><\/tr> Object 7<\/td> <\/td> <\/td> <\/td> <\/td> <\/td> <\/td> <\/td><\/tr> Object 8<\/td> <\/td> <\/td> <\/td> <\/td> <\/td> <\/td> <\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\n\n\n\nPART 5 \u2014 EVIDENCE AND REASONING<\/h2>\n\n\n\n
Object: ______________________<\/h3>\n\n\n\n
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\n\n\n\nDISCUSSION: <\/h2>\n\n\n\n
\n\n\n\nCONCLUSION: <\/h2>\n\n\n\n
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