The document outlines a 5-week PYP unit plan focusing on substances and their properties. Week 1 introduces separating substances with screens/filters and identifying mixtures like salt water. Week 2 continues investigating mixtures and their saturation limits. Week 3 identifies unknown chemicals by solubility and determines concentrations in drinks. Week 4 measures concentration in solutions and identifies more concentrated mixtures. Week 5 continues concentration investigations and introduces chemical reactions, with students writing a process report on their own mixture. The unit utilizes various assessments and connects concepts to related disciplines like social studies and reading.