Physical States and Properties Substances: Pure substances and mixtures by Judi Luepke, PhD. Reading Quiz Teach with this What can all substances be classified as? pure substances or mixtures compounds or mixtures homogeneous or heterogeneous homogeneous or solutions Which of the following is a pure substance? rain water tap water salt water distilled water Which statement about elements is true? Elements can be chemically separated. Elements are made up of molecules. Elements are chemically made. Elements are pure substances. Which substance has a definite composition? solution compound homogeneous mixture heterogeneous mixture Which substance is a heterogeneous mixture? sugar iron soil aluminum What is the classification of the substance in this model? solution pure substance element compound Which substance is an example of a mixture? salt sandwich aluminum alum Which substance forms when glitter, salt, and water are stirred together? compound element solution mixture What are the smallest particles of elements? atoms molecules atoms or molecules atoms and molecules What are the smallest particles of the substance in this model? atoms molecules atoms or molecules atoms and molecules Score Quiz