← Biochemistry: Solubility DVD Export Options Alphabetize Word-Def Delimiter Tab Comma Custom Def-Word Delimiter New Line Semicolon Custom Data Copy and paste the text below. It is read-only. Select All What determines whether or not a solvent can dissolve the solute? If the intermolecular forces are strong enough to separate the intramolecular forces holding the molecule or ion together. What determines whether or not a bond between two atoms is polar? Electronegativity difference Non-polar: <0.4 Polar covalent: 0.5-1.9 Ionic: >2.0 What is electronegativity? The ability of an atom to draw electrons towards it, this value is strongest at top right. What is a functional group? A reactive group of atoms in a functional group What are the 4 main functional groups? 1. R-OH (alcohol) 2. R-C=0 (carbonyl), 3.R -COOH (carboxyl, acid) C has a double bond to 1 oxygen 4. R-NH2 (amino, basic). Are the 4 main functional groups polar or non-polar? Very polar Are non-polar or polar molecules found in fats and oils? Non-polar molecules What do double bonds in a molecule mean? The more double bonds the less saturated it becomes, it also makes a kink in the chain which makes it easier too separated i.e. lower melting point How are some proteins soluble in water, despite their size? Proteins are huge molecules made up of long polypeptide chains with amino acid side chains, when in water(polar) they tend to fold in on themselves and polar ends face outwards allowing it do dissolve Is the polar head or non-polar tail hydrophobic? Non-polar tail How is a phospholipid bilayer constructed? The polar heads of a molecule face the water outside and inside the cell, while the non-polar tails face and interact with each other.