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Polarity and Electronegativity
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Given the following EN values, state two molecules which will form a polar bond?
C-Br, C-Cl, P-Br, P-Cl
In a polar bond, are valence electrons shared: equally or unequally?
Unequally (tend to be found on one side)
How can a molecule contain polar bonds but not be a polar molecule overall?
It depends on the shape of the molecule. Polar forces may cancel each other out.
What does it mean to be a polar molecule?
The molecule has a separation of charge: partial positive on one side and partial negative on the other side
How does electronegativity change across a period of the periodic table?
EN values increase across a row, as more protons are added to the nucleus within the same electron orbital
Which element has a partial charge in the bond between O and H?
Oxygen because it is more electronegative
What bond would two atoms of the same element share?
Nonpolar covalent
What kind of bond do sodium (Na) and bromine (Br) form? Hint: EN of Na = 0.9, EN of Br = 2.8
Ionic bond
Silicon (Si) has an electronegativity of 1.8. Hydrogen (H) has an electronegativity of 2.1. What type of bond would SiH4 be?
Nonpolar covalent bond
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