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DCA Week 6 Review

Learn the definitions of elements, compounds, and mixtures with examples. Match pictures, categorize compounds and elements, and identify elements in compounds. Understand the most abundant elements on Earth and in living matter.

cole-obrien
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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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