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Elements/Compounds

Elements/Compounds. Admit Slip. Which of the following is an element? Na Mg(OH) 2 O 2 CH 4. Today’s Objectives:. Students will be able to: Identify, define and compare elements, compounds, and pure substances Identify and compare the four different types of bonding.

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Elements/Compounds

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  1. Elements/Compounds

  2. Admit Slip • Which of the following is an element? • Na • Mg(OH)2 • O2 • CH4

  3. Today’s Objectives: • Students will be able to: • Identify, define and compare elements, compounds, and pure substances • Identify and compare the four different types of bonding

  4. Language Objectives: • Students will be able to: • Write an explanation of why a substance is an element or a compound

  5. Agenda • Homework Check/Review • Notes • Group Practice • Bonding, Elements, and Compounds Worksheet • Exit Slip • Product: Notes, Worksheet, and Exit Slip • Homework: Problems #1-6

  6. Elements and Compounds12/1/10 • Elements are pure substances that are the simplest form of matter. They are made up of all the same type of atom. They can be found on the Periodic Table of Elements. • Examples: Ca and N2 • Elements cannot be broken down by physical methods or chemical reactions. They can only be broken down by nuclear reactions.

  7. Compounds are also pure substances that are a fixed ratio of two or more elements that are chemically bonded. Compounds can only be broken down by chemical reactions, not by physical methods.

  8. Compounds are always represented by molecular formulas . Formulas contain more than one symbol and may contain subscripts (numbers written low). They indicate how many atoms of each element are in a compound. • Example: CH4 H2O

  9. Practice Problems • Do the following substances represent an element or a compound? • Ti • SiO2 • I2 9

  10. More Practice Problems • What do elements and compounds have in common? • What is different about elements and compounds? 10

  11. Classwork • Please complete the classwork with a • classmate to be checked at _________ ! 11

  12. Exit Slip • Consider the two substances BeO and F2. • Which is an element? • Which is a compound? • Explain how you know this.

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