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For Review….

For Review…. For any atom -. Atomic Number = # protons # protons = # electrons Atomic Mass = # protons + # neutrons. The Particles. In the nucleus – Protons (+) Neutrons (0) In the outer energy shells : -Electrons (-). The Outer Energy Level is the Valence Shell.

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For Review….

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  1. For Review….

  2. For any atom - • Atomic Number = # protons • # protons = # electrons • Atomic Mass = # protons + # neutrons

  3. The Particles.. • In the nucleus – • Protons (+) • Neutrons (0) • In the outer energy shells : • -Electrons (-)

  4. The Outer Energy Level is the Valence Shell. An atom is said to be “stable” if it’s valence shell is full. These are the only electrons that may Leave the atom.

  5. States of Matter

  6. A state of matter is the form in which a substance exists • Solid, liquid or gas

  7. Solids • The atoms in solids are packed closely together • Has a definite volume, and shape • Example: nail

  8. Liquids • Atoms are close together but can flow over one another. • Definite volume but takes the shape of its container

  9. Gas • Atoms are spread apart and can move throughout their container • No definite shape or voluem.

  10. Can substances change state?

  11. Physical Changes Ice cream melting is a physical change. In a physical change, the form of a substance or some of the substances properties may change, but its chemical composition – the way its atoms are put together – remains unchanged. The matter involved in a physical change keeps its identity! www.julieleung.com/ archives/2004_07.html Day 2-#2

  12. Chemical Changes In a chemical change, the elements of one compound recombine to form one or more new chemical compounds with different properties. www.pc.chemie.uni-siegen.de/.../ v44-1-1.html 2 Na + 2 H2O > 2 NaOH + H2 To view this reaction go to: http://www.pc.chemie.uni-siegen.de/pci/versuche/pics/anim/natrium.mpg Day 2-#2

  13. How can you spot a chemical change? • Change in temperature • Change in color • Production of a precipitate or gas. • A precipitate is a solid that settles out of solution as a result of a chemical reaction Remember: the only sure sign of a chemical change is the production of a new substance http://jchemed.chem.wisc.edu/JCESoft/CCA/CCA0/Movies/NACL1.html

  14. Chlorine + Potassium Iodide

  15. A liquid evaporates to become a gas Iron rusting Salt dissolves in water Milk turning sour Baking a cake Burning wood Fireworks A gas condenses to become a liquid Ripping a sheet of paper Slicing a cake Identify the following as physical or chemical changes: Day 2-#2

  16. Which of these changes in rocks is a physical change? A Acid rain damaging marble B Iron in rock combining with oxygen to form hematite C Carbonic acid weathering limestone D An ice wedge shattering a slab of shale Day 2-#2 Question is from TEA Released TAKS Test

  17. Which of the following processes is an example of a physical change associated with an oak tree? A Decomposition of bark by bracket fungi B Starches and sugars being broken down during energy production C Water and carbon dioxide being converted to glucose D Evaporation of water from the surfaces of Leaves Day 2-#2

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