1) This document discusses scientific investigations including descriptive, classificatory, and experimental investigations. It focuses on experimental investigations and the key components of experiments such as developing hypotheses, identifying variables, collecting data, and drawing conclusions. 2) As an example, it describes an investigation using M&Ms placed in water to observe how color and other variables affect dissolution. It identifies questions that could be investigated and variables that could be manipulated or controlled. 3) It explains how water is able to dissolve many substances like sugar due to water's polar nature and how water and sugar molecules interact through attraction of opposite charges.