Atoms, elements, molecules, compounds and （原子、元素和分子化合物）.pdfVIP

Chemistry for the gifted and talented 1 Atoms, elements, molecules, compounds and mixtures Student worksheet: CDROM index 01SW Discussion of answers: CDROM index 01DA Topics Atoms, elements, molecules, compounds, mixtures, structure and different representations of bonds and atoms. Level More able 11–13 year old students. Prior knowledge The differences between elements, mixtures and compounds. Rationale This activity is designed to help students clarify the relationship between various parts of their knowledge in these topics and develop the skill of using Venn diagrams in organising their understanding. Venn diagrams are a method of organising your thoughts like lists or mind maps. The particular advantage of Venn diagrams is that they clearly show the interconnection or overlap between categories. For example, a substance may be molecular and an element, or molecular and a compound. A reaction may be feasible and proceeds at room temperature, or feasible but not occur because of high activation energy. They also show where characteristics are mutually exclusive: this substance, if a compound, cannot be an element. Different representations of atoms and molecules are used to show that there are several different ways that they can be visualised. 2 Chemistry for the gifted and talented Use The activity could be used as an extension activity for students at any stage after the main topics listed have been taught. It could be used as a follow up to a lesson on compounds and mixtures. To extend the ideas here, students could be asked to think of other substances to be added