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CHEMISTRY - PowerPoint PPT Presentation

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CHEMISTRY

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  1. CHEMISTRY Mrs. Huls

  2. CHEMISTRY

  3. Atoms • Found in EVERYTHING! • Very, very, very small particles

  4. Parts of an Atom • Nucleus • Proton (positive charge) + • Neutron (neutral or no charge) O • Electron Cloud • Electron (negative charge) -

  5. The Periodic Table of Elements • 109 known elements • Scientists are constantly learning more about elements

  6. Periodic Table of Elements • The elements are separated into 4 groups on the table. They are → metals → nonmetals → semi-metals → made artificially

  7. ElementsThe 4 properties of all elements How it looks How it reacts with other elements How hard it is How it conducts electricity

  8. Compounds • 2 or more elements that chemically combine to form a chemical reaction

  9. A new solid substance is produced A new gas is produced 4 changes that show a Chemical Reaction • A color change • Heat or light is given off

  10. Chemical Bonds • A chemical bond is created every time a compound is created. • There are two types of chemical bonds • Ionic Bonds – the electrons jump • Covalent Bonds – the electrons are shared

  11. Mixtures • A mixture is created when two or more substances undergo a physical change, not a chemical change. • There are three types of mixtures. • Solutions • Suspensions • Colloids

  12. pH • An indicator is used to test the pH of a solution. • The pH scale is from 0-14. • ACID → 0-6.9 RED • BASE → 7.1-14 BLUE • NEUTRAL→ 7 • 2 types of indicators – litmus paper & pH indicator strips