U1S3 polarisation

Question 1

What is electronegativity

Answer 1

• ability to attract bonding electrons in a covalent bond
• measured on Pauling scale

Question 2

What leads to a polar molecule of two atoms

Answer 2

• when two atoms have different electronegativites
• bonding electrons are pulled towards more electronegative atom
• difference in electronegativity between two atoms causes a dipole

Question 3

What is a dipole

Answer 3

• a difference in charge between two atoms caused by a shift in electron density in the bond

Question 4

What makes a molecule polar

Answer 4

• when charge is distributed unevenly over the molecule
• occurs when molecule unsymmetrical