5.2 Molecular Polarity Obj 2

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Presentation transcript:

5.2 Molecular Polarity Obj 2 Chemistry

Essential Questions What is a polar molecule? What is a dipole? How do you determine if a molecule is polar? How does polarity affect solubility?

Polarity of A Molecule Just as an individual bond can be Polar, so can an entire molecule A polar molecule has one end of molecule that is negative and one end that is positive The negative and positive ends are called dipoles Depends on shape and type of bond Polar molecules must have polar bonds

Polarity of A Molecule (cont) A molecule will be polar if there is a positive and negative end on the molecule Water A molecule can be nonpolar with polar bonds if the molecule does not have a positive and negative end. Carbon dioxide

Polarity of A Molecule (cont) Here are the steps for telling if it’s polar Write the Lewis Structure in the correct shape Label polar bonds with arrows/symbols. If there are no polar bonds then it is nonpolar. If there are polar bonds go to step 3. Check to see if the molecule has both a positive and negative end. If so it is polar and if not it is nonpolar.

Polarity of A Molecule (cont) Determine if the following molecules are polar Ammonia: NH3 Methane: CH4 H2S SiCl4 SeCl6 GeSH2

Why does polarity matter? Polarity affects how things will mix or dissolve. Nonpolar will only mix with nonpolar substances and polar with polar substances Solubility is when two compounds are able to mix together or be dissolved Insolubility is when they do not mix

Essential Questions What is a polar molecule? What is a dipole? How do you determine if a molecule is polar? How does polarity affect solubility?

5.2 Tracked Assignment 5.2 Tracked Assignment Worksheet