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September 24, 2012

September 24, 2012. Have your science journal out Review Ionic and Covalent bonds. Review Polarity Polarity Comic Hydrocarbons. Hydrocarbons. What are examples of chemical reactions?. In your digestive system Baking Soda and Vinegar Burning a candle Burning gasoline in a car engine.

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September 24, 2012

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  1. September 24, 2012 • Have your science journal out • Review Ionic and Covalent bonds. • Review Polarity • Polarity Comic • Hydrocarbons

  2. Hydrocarbons

  3. What are examples of chemical reactions? • In your digestive system • Baking Soda and Vinegar • Burning a candle • Burning gasoline in a car engine

  4. Looking closer at a burning candle • When a candle burns the wax reacts with oxygen in the air. • The wax that makes up a candle is called paraffin. • Paraffin is made up of only Carbon and hydrogen atoms. What kind of chemical bond occurs between hydrogen and carbon?

  5. Hydrocarbons • Molecules (covalently bonded) made of ONLY carbon and hydrogen. • Paraffin is one example of a hydrocarbon- C₂₅H₅₂ • Other examples include: • Methane- CH₄ • Propane- C₃H₈ • Butane- C₄H₁₀ Notice that all of the chemical formulas contain only carbon and hydrogen.

  6. Methane Chemical reaction. Methane is otherwise known as natural gas. Many people use it as a gas to cook with. C H4 + O2C O2 + 2H2 O

  7. Exit Slip • What term means that covalent bonds like water share their electrons unevenly? • What has a chemical make up of only hydrogen and oxygen? Answer these two questions on a post-it note and stick them on the board on your way out.

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