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After today, you will be able to…

After today, you will be able to…. Write structural formulas and dot formulas for covalently bonded molecules Identify shared and unshared electrons Explain the difference between single, double, and triple bonds - and write them using structural formulas/dot formulas. Day 3 - Notes.

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After today, you will be able to…

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  1. After today, you will be able to… • Write structural formulas and dot formulas for covalently bonded molecules • Identify shared and unshared electrons • Explain the difference between single, double, and triple bonds - and write them using structural formulas/dot formulas

  2. Day 3 - Notes Unit 4: Chemical Bonding Covalent Bonding Basics

  3. Covalent Bonding A sharing of electrons. • A single covalent bond is made up of two electrons • One electron is donated to the bond from each atom • Covalent bonding occurs between nonmetals only • Atoms that are covalently bonded are called molecules or molecular compounds.

  4. Properties of Molecular Compounds • Covalent bonds are much weaker than ionic bonds • Much lower melting and boiling points • Is a solid, liquid, or gas at room temperature • Non-conductors in any state

  5. Properties of Molecular Compounds The chemical formula for a covalently bonded group of atoms is called a molecular formula. • Indicates the exact makeup of one molecule. • Example: C6H12O6

  6. 4 1 5 7 6 1 4 3 1 2 1 4 3 2 1

  7. Example: Write the dot and structural formula for: H2 H H Rough Copy (Work): Dot Formula: Lewis Structural Formula: H H H H Single bond: A shared pair of two electrons.

  8. Example: Write the dot and structural formula for: O2 O O Rough Copy (Work): Dot Formula: Lewis Structural Formula: O O O O Unshared pair of electrons Double bond: Two shared pairs of four electrons.

  9. Example: Write the dot and structural formula for: N2 N N Rough Copy (Work): Dot Formula: Lewis Structural Formula: N N N N Triple bond: Three shared pairs of six electrons.

  10. Example: Write the dot and structural formula for: H2O O H O O Rough Copy (Work): Helpful tip: Put the atom in the middle that wants to make the most bonds! H H Dot Formula: Lewis Structural Formula: H H H

  11. Example: Write the dot and structural formula for: ONF N F O O O F F N N Rough Copy (Work): Dot Formula: Lewis Structural Formula:

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