This practical task consists of two parts. Students test various substances with hydrochloric acid, iodine solution, and universal indicator, and then complete a table with their observations. The second part requires students to identify four unknown solids using their tests and results from part one.
In this task, students look for patterns in electron arrangement in the periodic table. They use their ideas to place missing elements in the table, answer some questions about the patterns, and use the patterns to predict the properties of some elements.
Task: Students read a pH scale to determine how it shows the increasing strength of an acid and a base solution and decide from different pH products what the effect would be on an acidic soil. Assessment focus: interpreting a pH scale.