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Molecules and Mixtures



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Drexel SDP GK 12 LESSON Molecules and Mixtures Subject Area s Chemistry Physics and Engineering Associated Unit Geology Lesson Title Molecules and Mixtures Fluorescence micrograph of crystallized Alexa Fluor 555 dye Organic fluorescent compound www invitrogen com Grade Level 8 11 Lesson 1 Lesson Dependency none Time Required 150 mins Summary In this lesson students will be introduced to mixtures compounds and types of bonding Although the lesson was originally taught to an 8th grade class a brief introduction to quantum mechanics is included because the shape of the molecular orbitals provide a more concrete model to understand how bonding occurs Engineering Connection The foundation of materials engineering is based on the understanding of the relationship between the physical and chemical properties of a material their underlying structure and the processing that produces the structures Understanding the role of electrons in the bonding process has been crucial to the advances in the 20th century in electronics metallurgy and plastics Keywords Molecules mixtures compounds covalent bonding ionic bonding bonding energy moleualr orbitals Educational Standards Science 3 1 7 B 3 1 7 C 3 4 7 A Math 2 7 8D 2 9 8 H 2 11 8 A Pre Requisite Knowledge Atoms matter states of matter Learning Objectives After this lesson students should be able to Describe the difference between a molecule a mixture and a compound Estimate physical properties such as thermal coefficient of expansion and relative bond strength and elastic behavior of a solid based on the shape of the bond energy well Describe covalent and ionic and metallic bonding and give examples of compounds that form from each type of bonding Qualitatively describe the role of electrons in bonding Describe the difference between a molecule and a crystal Sketch the energy well formed by a bond Explain Bohr s Model of the atom Build a model of the electron orbitals in an atom base on the wave mechanical model 2 Introduction



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