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Unit 2: Atoms and Elements

Unit 2: Atoms and Elements. Lesson 3: Classifying Matter. Bell work (to be turned in within 10 minutes). Why did you have a bad report from the sub? Why did you not do your work? Why should I let you do the lab tomorrow? This will be a quiz grade!. SC State Standards.

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Unit 2: Atoms and Elements

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  1. Unit 2: Atoms and Elements Lesson 3: Classifying Matter

  2. Bell work (to be turned in within 10 minutes) • Why did you have a bad report from the sub? • Why did you not do your work? • Why should I let you do the lab tomorrow? • This will be a quiz grade!

  3. SC State Standards • 7.P.2.A Conceptual Understanding: All substances are composed of one or more elements. Elements are pure substances which contain only one kind of atom. The periodic table organizes these elements based on similar properties. Compounds are substances composed of two or more elements. Chemical formulas can be used to describe compounds. • 7.P.2A.3: Analyze and interpret data to describe and classify matter as pure substances (elements or compounds) or mixtures (heterogeneous or homogeneous) based on composition. • 7.P.1A.4: Analyze and interpret data from informational texts, observations, measurements, or investigations using a range of methods (such as tabulation, graphing, or statistical analysis) to (1) reveal patterns and construct meaning or (2) support hypotheses, explanations, claims, or designs

  4. Objectives (SWBAT) • analyze and interpret data to describe and classify matter as pure substances or mixtures based on composition.

  5. Day 1: Matter

  6. What is Matter • 430 BC Empedocles • Proposed that all matter was made of 4 elements, Earth, air, fire, and water • 1600’s • Discovered that it was more than 4 elements

  7. Elements • All matter made from more than 100 different substances • Is a substance that can’t be broken down into anything smaller • Simplest substance • Identified by chemical and physical properties

  8. Atoms • An atom is the basic particle from which all elements are made • Positivelycharged nucleus • Surrounded by a negativelycharged electron cloud • Made of • Protons and they are positive • Neutrons and they are neutral • Electrons and they are negative • The number of protonsgive the atom its characteristics

  9. Molecules • Chemical Bonds • When elements combine with each other • A force of attraction between two atoms • Atoms combine to form larger particles • A molecule is two or more atoms held together by chemical bonds • Example: • H20, CO2, O2, C6H12O6

  10. Compounds • Compound • A substance made of two or more elements that are chemically combined in a set ratio • When elements combine they can have very different properties then the parent elements.

  11. Chemical Formula • Chemical Formula • Shows the elements in the compound and the ratio of atoms C6H12O6 Contains 12 Hydrogen Atoms Carbon Contains 6 Oxygen Atoms Contains 6 Carbon Atoms Chemical Formula for sugar

  12. Day 2: Types of Mixtures Lesson 3: Matter and Compounds

  13. Bell Work • What is an atom and what are the three parts of an Atom? • What information can you get from the following Atomic Symbol?

  14. Today’s Agenda • Bell Work • Note on Matter • (4th and 6th Need to make observations) • Matter Worksheet

  15. Today’s Objectives (SWBAT) • Analyzeand interpret data to describe and classify matter as pure substances or mixtures based on composition.

  16. Mixtures • Made from two or more substances • Found together at the same place and same time • Each substance keeps its own properties • Two types • Heterogeneous and Homogeneous Mixtures

  17. Heterogeneous Mixtures • Easily see the different parts • Can easily be separated • Examples • Salsa, sand, fruit salad, granite, sedimentary rock

  18. Homogenous Mixtures • Are evenly mixed • Can’t be easily separated • Examples: • Sweet tea, ketchup, honey, sea water, oil

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