Mixtures can either be homogeneous or heterogeneous.Ī homogeneous mixture, also known as a solution, contains particles that are very small. But what if my sample has several different types of elements and compounds all mixed together? Matter can also be classified as a mixture.
Pure substances, which are one type of matter, can either be elements or compounds. For example, Pyrite will always exist as one Fe atom for every two S atoms. Compounds always have the same ratio of elements. Compounds are a second type of pure substance. Compounds are made from two or more elements that are chemically bonded together. Both ‘Fe’ and ‘S’ can be found on the periodic table. They are made from only one type of atom.įool’s gold, or Pyrite, is represented by the letters ‘FeS 2 ’. Elements cannot be broken down into simpler substances. Elements are a type of matter known as a pure substance. Since real gold can be found on the periodic table, that makes it an element. The periodic table lists all of the known elements. This combination of letters can be found on the periodic table. Real gold is represented by the letters ‘Au’. Notice the formulas listed for real gold and Fool’s gold in the table. This list of physical properties would give me a starting point for tests I could run to begin gathering data to help me answer my question - Is my sample real gold or Fool’s gold? A physical property is an observation or measurement that can be taken without changing the identity of a substance. I could begin answering this question by observing some physical properties of the sample I collect. If I want to take a trip down to the river and pan for gold, how could I determine whether the sample I’m collecting is real gold or Fool’s gold?
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Learning how to sort matter into categories that share similar characteristics can help us make better observations so that we can more accurately answer questions that we have. Matter is anything that has mass and takes up space. Everything around us is made from matter. Part of science is learning how to ask questions and make observations about our world. Link to Google Doc Guided Notes worksheet Students will apply tests, based on physical properties of matter samples, to determine whether a heterogeneous mixture is a suspension or a colloid.Students will apply tests, based on physical properties of matter samples, to determine whether a mixture is homogeneous or heterogeneous.Students will learn how to categorize matter as either pure substances or mixtures.Teachers: Link to the PD session overviewing this activity
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