1. What is a "sol" and how does it differ from a solution? Give two examples. 2. What color signifies the successful preparation of colloidal silver nanoparticles and what color indicates that aggregation has occurred? 3. What is Tyndall effect and how would we use it to characterize sols containing nanoparticles? (Read up on it!) 4. What roles do glucose and sodium citrate play in the synthesis of silver nanoparticles? 5. List two reasons why chemical and physical properties at the nanoscale are not the same as on the macroscale