This document appears to be a science worksheet containing multiple choice and fill-in-the-blank questions about elements, compounds, the periodic table, and classifying different materials as pure substances or mixtures. There are 15 multiple choice questions testing knowledge of elements, chemical symbols, the periodic table, and compounds. There are also questions asking to write the chemical symbol for elements and name chemical symbols. Finally, there are questions to identify given materials as pure substances or mixtures, elements or compounds, and whether they are homogeneous or heterogeneous.