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DCA Week 6 Review

DCA Week 6 Review. Sept 27, 2013. Definitions:. 1) Elements -Pure Substance -Identical Atoms Examples: O, N, Fe * remember all elements start with1 capital letter 2) Compounds -Not easily separated -Chemically combined Examples: NaCl (salt), H 2 O (water) 3) Mixtures

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DCA Week 6 Review

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  1. DCA Week 6 Review Sept 27, 2013

  2. Definitions: 1) Elements -Pure Substance -Identical Atoms Examples: O, N, Fe *remember all elements start with1 capital letter 2) Compounds -Not easily separated -Chemically combined Examples: NaCl (salt), H2O (water) 3) Mixtures -very easy to separate -Each part keeps its own identity and properties -Examples: Trail mix, salads, cereal

  3. Match the following pictures Element Compound Mixture A B C Why do we use models like these when we talk about the atoms in each of them?

  4. Place these in the proper category: Compounds Elements CO2 O2 N H2O NaCl He H2O2 Fe

  5. How Many Different Elements are in each of the following compounds: 1) H2SO4 2) CaCO3 3) C6H10O5 4) H2O2

  6. Most Abundant: • Ocean = Hydrogen • Atmosphere= Nitrogen (78%) • Earth= Oxygen (47%) • Living Matter= Carbon *The Ocean, Atmosphere and Earth all have one element in common: Oxygen

  7. In the Atmosphere: • Carbon Dioxide = CO2 • Oxygen= O2 • Nitrogen= N • Water Vapor= H2O

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